TB3200

UART with DALI Protocol Technical Brief

Introduction

Author: Christopher Best, Microchip Technology Inc.

The Digital Addressable Lighting Interface (DALI) is an international standard that governs intelligent
lighting control. DALI was developed to replace analog lighting control with a flexible digital control
system. Microchip's Universal Asynchronous Receiver Transmitter (UART) module has added protocol
support features that simplify DALI usage. This technical brief will give a short summary of the DALI
protocol and explain how to use the UART module for DALI control.

© 2018 Microchip Technology Inc. DS90003200A-page 1

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Table of Contents

Introduction......................................................................................................................1

1. DALI Overview...........................................................................................................3
1.1. DALI Terminology......................................................................................................................... 3
1.2. Electrical Specifications................................................................................................................4
1.3. Bus Topology................................................................................................................................5
1.4. Bus Communication..................................................................................................................... 5

2. Configuring the UART for DALI................................................................................. 8

2.1. DALI Control Device Mode...........................................................................................................8
2.2. DALI Control Gear Mode..............................................................................................................9

3. Conclusion............................................................................................................... 11

4. DALI Commands..................................................................................................... 12

The Microchip Web Site................................................................................................ 17

Customer Change Notification Service..........................................................................17

Customer Support......................................................................................................... 17

Microchip Devices Code Protection Feature................................................................. 17

Legal Notice...................................................................................................................18

Trademarks................................................................................................................... 18

Quality Management System Certified by DNV.............................................................19

Worldwide Sales and Service........................................................................................20

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DALI Overview

1. DALI Overview
Lighting systems were originally designed for one purpose: to provide light for visual tasks. A simple light
switch either turned on or turned off the system, while a dimmer switch changed the intensity of a lighting
fixture's output. If a fixture burned out, it could be replaced, but there was no assurance that the new light
would behave the same as other fixtures within the system. If the new fixture was brighter or dimmer than
the other fixtures, the overall lighting would not be uniform across the area being illuminated. Other than
physically noticing that a fixture needed to be replaced, there was not a way to detect if a fixture was
operational.
Today, the demand for power efficiency and customization has led to the design of intelligent lighting
control systems. The DALI protocol was designed to meet these demands.
DALI lighting systems have several advantages over traditional analog lighting systems, including:
• Simple wiring of control lines
• Control of individual units or groups of units through addressing
• Simultaneous control of all units through broadcast addressing
• Simple communication structure
• Ability to check the status of an individual or group of fixtures for faults, power levels, etc.
• Creation of custom lighting scenes
• Logarithmic dimming that matches the eye's sensitivity
• More functionality and lower-system cost compared to 1-10V systems

1.1 DALI Terminology

The list below contains basic DALI terminology used in the protocol:
• Control Device: A device that transmits commands to other devices connected to the same bus. A
control device can also receive commands and backward frames.
• Control Gear: A device that receives commands in order to control its output.
• Ballast: An electronic device that regulates current and voltage to the lamp.
• Frame: A packet of information consisting of a Start bit, command/data byte(s), and a Stop
condition.
• Forward Frame: The frame sent by the control device to the control gear. A forward frame consists
of a Start bit, an address byte, up to two data bytes, and a Stop condition.
• Backward Frame: The frame sent back to the control device from a responding control gear. The
backward frame consists of a Start bit, one data byte, and a Stop condition.
• Command: A specific instruction intended to cause a reaction in a receiver.
• Short Address: The address of an individual control gear within the system.
• Group Address: The address of a group of control gears within the system.
• Broadcast: The address used to communicate with all control gears within the system.
• Arc Power: Power supplied to the lighting source.
• Direct Arc Power Control (DAPC): A method that immediately sets an individual or multiple control
gears to a specific power level.
• Scene: A configurable preset lighting level.

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DALI Overview

• Building Management System (BMS): A computer-based control system installed in buildings that
controls and monitors the mechanical and electrical equipment of a building.

Filename: Control Gear Voltages.vsdx

Title:
1.2 Electrical Specifications
Last Edit: 4/6/2018
First Used:
The DALI bus
Notes:
operates at a nominal voltage range
between 0V and 20.5V, and an absolute maximum
voltage range between -6.5V and 22.5V. The maximum allowable voltage drop across the bus is 2V. The
maximum current of the DALI bus is 250 mA, with each unit on the bus limited to a maximum current
consumption of 2 mA.
A Control Gear's logic 'high' level falls within the range of 9.5V and 20.5V, although the most common is
16V. A logic 'low' level falls between +6.5V and -6.5V. The threshold (undefined) voltage region falls
between 6.5V and 9.5V (see figure below).
Figure 1-1. Control Gear Voltages

Rev. Control Gear Voltages

4/6/2018

22.5V

16V
Logic 'High' (Idle)

9.5V

Undefined

6.5V

0V
Logic 'Low'

-6.5V

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 First Used:
Notes:

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DALI Overview

A Control Device's logic 'high' level falls in the range of 10V and 22.5V. A logic 'low' level falls between 0V
and 4.5V. The threshold (undefined) voltage region falls between 4.5V and 10V (see figure below).
Figure 1-2. Control Device Voltages

Rev. Control Device

4/6/2018

22.5V

16V
Logic 'High' (Idle)

10V

Undefined

4.5V
Logic 'Low'
0V

-6.5V

The bus may have a single power supply, multiple power supplies, or a power supply that has been
integrated into one of the ballasts. The output voltage of the bus power supply must be between 12V and
20.5V.

1.3 Bus Topology

The DALI protocol limits the system to a maximum of sixty-four single units, a maximum of sixteen
groups, and a maximum of sixteen scenes. Each of the sixty-four single units is assigned a short address,
which is stored within the ballast. Each individual unit may also contain a group assignment number,
lighting scene values, fading times, and emergency lighting levels. Short addresses may be programmed
into the ballast by the manufacturer during production, or may be programmed by the designer during the
installation process. Group addresses are typically assigned by software during installation, allowing for
future changes in the group structure.
DALI has a free-form wiring structure, so the use of daisy-chained, linear, star, or mixed structure wiring
connections are allowed, with the exception of ring-shaped connection structures. DALI sets a maximum
distance of 300 meters between unit connections, and allows a maximum of a 2-volt drop across the
connecting wires from the interface power supply to each unit. The DALI bus operates at a 1200 bps
baud rate, so there is no need for special cables or wires.

1.4 Bus Communication

DALI frames (data packets) are created using Manchester (bi-phase) encoding, which is done through
UART hardware. The Manchester code is a digital encoding format in which a logic '1' represents a rising-
edge transition that occurs during a bit period, while a logic '0' represents a falling-edge transition during
a bit period (see figure below). Start and Stop bits are encoded as a logic '1'.

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 Title:
Last Edit: 3/29/2018
First Used:
Notes: TB3200
DALI Overview

Figure 1-3. Manchester Bit Encoding

Rev. Manchester
3/29/2018

Logic '1' Logic '0'

Half-bit period Half-bit period

Bit period Bit period

Frames are transmitted at a baud rate of 1200 bps, and each frame is always sent with the Most
Significant bit (MSb) first. Since the baud rate is 1200 bps, each bit period lasts for 833.33 µs, and each
half-bit last for 416.67 µs. Half-bit period times are important since Manchester encoding requires two-bit
transitions for each logical data bit.
A forward frame is the data packet transmitted by the control device to the control gear or input device.
A DALI 1.0 forward frame contains the Start bit, followed by the address byte, one data byte, and two
Stop bits.
Filename: Forward Frame.vsdx
Title:
A Last
DALI 2.0 forward
Edit: frame contains the Start bit, followed by the address byte, up to two data bytes, and a
4/13/2018
First Used:
Stop condition
Notes:
(see Figure 1-4). The DALI 2.0 24-bit forward frame, including the Start and Stop bits, lasts
for 23.2 ms, or approximately 56 half-bit times, while the 16-bit forward frame lasts for 16.2 ms, or 39 half-
bit periods. Once the control device completes the transmission of the frame, the control gear must begin
to transmit the backward frame no sooner than 5.5 ms (approximately 14 half-bit times) and no later than
10.5 ms (approximately 25 half-bit periods). Once the backward frame has been received in its entirety,
the control device must wait a minimum of 2.4 ms (approximately six half-bit periods) before transmitting
the next forward frame (see Figure 1-5).
Figure 1-4. DALI Forward Frame
Rev. Forward Frame
4/13/2018

Bit
time
Start
bit
Y A A A A A A S D D D D D D D D D D D D D D D D I I I I I I

Address byte (1) Data bytes Stop bits (Idle line)

Half-bit
time

Note 1: The addressing scheme for the Address byte is as follows:

Y: Address type bit

Y = 0: Indicates an individual or short address
Y = 1: Indicates a group address or broadcast

A: Address bits

S: Selector bit
S = 0: Data bytes indicate Direct Arc Power level
S = 1: Data bytes indicate a command

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DALI Overview

Figure 1-5. DALI Frame Timing

Rev. Frame Timing

5.5 ms ≤ x ≤ 10.5 ms x ≥ 2.4 ms
4/13/2018

(≈ 14 ≤ x ≤ 25 Half-bit (≈ 6 Half-bit
periods) periods)
Backward
Forward Frame Forward Frame
Frame

23.2 ms 23.2 ms
(≈ 56 Half-bit periods) 9.95 ms (≈ 56 Half-bit periods )
(≈ 24 Half-bit
periods)

Filename: Backward frame.vsdx

A backward frame is the response packet transmitted from the control gear to the control device. A
Title:
Last Edit:
backward 4/13/2018
frame consists of the Start bit, one data byte, and a Stop condition (see figure below). A
First Used:
backward frame, including the Start and Stop bits, lasts for 9.95 ms (approximately 24 half-bit periods).
Notes:
The data byte may be of any value, depending on the command that was issued by the control device. If
a backward frame's data byte is 0xFF, the response is considered a 'yes'. If a response is expected and
the bus remains Idle, the response is considered a 'no'.
Figure 1-6. DALI Backward Frame

Bit Rev. Backward frame

time
4/13/2018

Start
bit
D D D D D D D D I I I I I I

Data byte Stop bits (Idle line)

Half-bit
time

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Configuring the UART for DALI

2. Configuring the UART for DALI

The UART module can be configured for DALI mode communication via the UART Mode Select
(MODE<3:0>) bits of the UART Control Register 0 (UCON0). There are two selections for DALI – either
Control Device mode or Control Gear mode.

2.1 DALI Control Device Mode

The DALI Control Device mode is configured using the following settings:
• Load the MODE<3:0> bits of U1CON0 with '0b1000', placing the UART into Control Device mode.
• Set the Transmit Enable Control (TXEN) bit of U1CON0 to allow transmission.
• Set the Receive Enable Control (RXEN) bit of U1CON0 to allow reception.
• Load the UART Parameter 1 Register (U1P1H:U1P1L) pair with the number of half-bit periods of
Idle time between consecutive forward frame transmissions. In this case, the minimum value
loaded should be 0x16, or 22 half-bit periods.
• Load the UART Parameter 2 Register (U1P2H:U1P2L) pair with the number of half-bit periods of
idle time used to determine if the frame is a forward frame. If a frame is received before the half-bit
delay expires, it is considered a backward frame. If reception occurs after the half-bit period delay
expires, the frame is detected as a forward frame, and sets the Parity Error Interrupt Flag (PERIF)
bit of the UART Error Interrupt Flag Register (U1ERRIR).
• Load the value used to achieve a 1200 baud rate into the UART Baud Rate Generator Register
(U1BRGH:U1BRGL) pair.
• Configure the Transmit Polarity Control (TXPOL) bit of the UART Control Register 2 (U1CON2) to
match the appropriate output polarity of the interface circuit.
• Configure the Receive Polarity Control (RXPOL) bit of U1CON2 to match the appropriate input
polarity of the interface circuit.
• Load the value '0b10' into the Stop Bit Mode Control (STP<1:0>) bits of U1CON2 to ensure the
frames contain two Stop bits as required by the DALI protocol.
• Load the RxyPPS register (PPS output) with the Tx pin selection code to map the Tx output to the
desired pin.
• Configure the U1RXPPS register to match the desired input pin.
• Clear the TRIS bit associated with the Tx output pin.
• Set the TRIS bit associated with the Rx input pin.
• Clear the ANSEL bit associated with the Rx input pin.
• Set the Serial Port Enable (ON) bit of U1CON1.
A forward frame is initialized by writing the address byte into the UART Transmit Register (U1TXB). If
there is no data residing in the Transmit Shift Register (TSR), the address byte is immediately transferred
to the TSR, allowing the first data byte to be written into U1TXB. Once the TSR shifts out the address
byte, the data in U1TXB is transferred into the TSR, setting the UART Transmit Interrupt Flag (U1TXIF)
bit.
Once the U1TXIF is set, but before the Transmit Shift Register Empty Interrupt Flag (TXMTIF) bit of the
U1ERRIR register is set, the next data byte must be loaded into U1TXB to ensure that each byte within
the frame is transmitted without an interruption. The TXMTIF bit is set once the TSR has shifted out the
last byte and there is no data in the U1TXB register, indicating the end of the frame. When TXMTIF is set,

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Configuring the UART for DALI

hardware holds the Tx output in the Idle state for the number of Stop bits selected by the STP<1:0> bits
of U1CON2.
After the last Stop bit has been transmitted, the Tx output is held in the Idle state for the number of half-bit
times found in the U1P1H:U1P1L register pair. Any writes to the U1TXB register that occur after TXMTIF
has set but before the U1P1 wait time expires are held in U1TXB. Once the wait time expires, the data is
immediately transmitted. If a backward frame is received during the wait time, any data written into
U1TXB will be held until the complete reception of the backward frame plus the additional U1P1 wait
time.
Once the two Stop bits of a backward frame have been received, the U1P1 wait timer resets and restarts
its timing function. Any data pending in the TSR will be transmitted once the wait time elapses.
Forward frame data stored in the TSR and U1TXB can be replaced or deleted by setting the Transmit
Buffer Empty Status (TXBE) bit of the UART FIFO Status register (U1FIFO). Setting TXBE flushes any
data left in both the TSR and the U1TXB registers. It is important to note that the TXBE bit can only be
cleared by hardware, and is clear whenever there is data in either the TSR or U1TXB.
It is important to note that backward frames are automatically received, and may or may not arrive within
the allowed time window. If the backward frame arrives outside of the time window and collides with a
forward frame, the Transmit Collision Interrupt Flag (TXCIF) bit of the U1ERRIR register is set. If the
backward frame arrives outside of the time window and no collision occurs, the module continues normal
operation. TXCIF will also be set when a received bit is missing the half-bit transition.

2.2 DALI Control Gear Mode

The DALI Control Gear mode is configured using the following settings:
• Load the MODE<3:0> bits of U1CON0 with '0b1001', placing the UART into Control Gear mode.
• Set the Transmit Enable Control (TXEN) bit of U1CON0 to allow transmission.
• Set the Receive Enable Control (RXEN) bit of U1CON0 to allow reception.
• Load the UART Parameter 1 Register (U1P1H:U1P1L) pair with the number of half-bit periods of
Idle time between the reception of forward frame and the transmission of a backward frame. The
allowable time frame is between 5.5 ms and 10.5 ms, so loading a value of 0x16 (22 half-bit periods
or 9.17 ms) will meet the timing requirements.
• Load the UART Parameter 2 Register (U1P2H:U1P2L) pair with the number of half-bit periods of
Idle time used to determine if the frame is a forward frame. If a frame is received before the half-bit
delay expires, it is considered a backward frame. If reception occurs after the half-bit period delay,
the frame is detected as a forward frame, and sets the Parity Error Interrupt Flag (PERIF) bit of the
UART Error Interrupt Flag Register (U1ERRIR).
• Load the value used to achieve a 1200 baud rate into the UART Baud Rate Generator Register
(U1BRGH:U1BRGL) pair.
• Configure the Transmit Polarity Control (TXPOL) bit of the UART Control Register 2 (U1CON2) to
match the appropriate output polarity of the interface circuit.
• Configure the Receive Polarity Control (RXPOL) bit of U1CON2 to match the appropriate input
polarity of the interface circuit.
• Load the value '0b10' into the Stop Bit Mode Control (STP<1:0>) bits of U1CON2 to ensure the
frames contain two Stop bits as required by the DALI protocol.
• Load the RxyPPS register (PPS output) with the Tx pin selection code to map the Tx output to the
desired pin.

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Configuring the UART for DALI

• Configure the U1RXPPS register to match the desired input pin.

• Clear the TRIS bit associated with the Tx output pin.
• Set the TRIS bit associated with the Rx input pin.
• Clear the ANSEL bit associated with the Rx input pin.
• Set the Serial Port Enable (ON) bit of U1CON1.
When the UART is set into Control Gear mode and the serial port is enabled, the UART begins to monitor
for a received forward frame. Frames that are received after the U1P2 wait time expires are detected as a
forward frame and are stored in the receive FIFO; if a frame is received before the U1P2 wait time
expires, the frame is detected as a backward frame and ignored since a control gear can only receive
forward frames. Backward frames from other Control Gear are ignored.
Once the Control Gear receives the last Stop bit of the forward frame, hardware starts a timer to delay the
backward frame response by the number of half-bit periods stored in the U1P1 register.
The data received in the forward frame is processed by the Control Gear's application software. If a
response is required, the application software writes the backward frame into U1TXB. The frame is held
for transmission until the wait time delay expires. If the response is written into U1TXB after the wait time
delay expires, the TXMTIF bit is held low, and the response is held in U1TXB until a new forward frame is
received and the wait time associated to that frame has expired. If the UART Receive Interrupt Flag
(U1RXIF) bit is set before TXMTIF becomes set, it means that a new forward frame was received before
the pending backward frame was sent. In this case, the pending backward frame may hold an incorrect
response to the new forward frame, therefore, the pending backward frame can be deleted by setting the
TXBE bit.

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Conclusion

3. Conclusion
The Digital Addressable Lighting Interface (DALI) protocol is a commercial and industrial standard related
to digitally controlled lighting. Microchip's UART module has added protocol support features that simplify
DALI. Module hardware automatically adds Start and Stop bits to the data stream, and does the
necessary Manchester encoding/decoding required by the DALI protocol. For more information, please
visit www.microchip.com.
REFERENCES:
• International Standard CEI IEC 60929, Third Edition 2006 – 01
• International Standard IEC 62386-101, Edition 2.0 2014 – 11
• International Standard IEC 62386-102, Edition 2.0 2014 – 11
• International Standard IEC 62386-103, Edition 1.0 2014 – 11

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DALI Commands

4. DALI Commands
The DALI protocol defines several standard commands which allow system designers to use devices
from different manufacturers without having to modify software. The Microchip DALI 2.0 library contains
the following commands:

Command Opcode Description

OUTPUT LEVEL INSTRUCTIONS
OFF 0x00 Switches off lamp(s)
UP 0x01 Increases lamp(s) illumination level
DOWN 0x02 Decreases lamp(s) illumination level
STEP UP 0x03 Increases the target illumination level by 1
STEP DOWN 0x04 Decreases the target illumination level by 1
RECALL MAX LEVEL 0x05 Changes the current light output to the
maximum level
RECALL MIN LEVEL 0x06 Changes the current light output to the
minimum level
STEP DOWN AND OFF 0x07 If the target level is zero, lamp(s) are turned
off; if the target level is between the min. and
max. levels, decrease the target level by one;
if the target level is max., lamp(s) are turned
off
ON AND STEP UP 0x08 If the target level is zero, lamp(s) are set to
minimum level; if target level is between min.
and max. levels, increase the target level by
one
ENABLE DAPC SEQUENCE 0x09 Indicates the start of DAPC (level)
commands
GO TO LAST ACTIVE LEVEL(1) 0x0A Sets the target level to the last active output
level
GO TO SCENE 0x10 Sets a group of lamps to a predefined scene
CONFIGURATION INSTRUCTIONS
DALI RESET 0x20 Configures all variables back to their Reset
state
STORE ACTUAL LEVEL IN 0x21 Stores the actual level value into Data
DTR0 Transfer Register 0 (DTR0)
SAVE PERSISTENT 0x22 Stores all variables into Nonvolatile Memory
VARIABLES(1) (NVM)
SET OPERATING MODE 0x23 Sets the operating mode to the value listed in
DTR0(1) DTR0

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DALI Commands

RESET MEMORY BANK 0x24 Resets the memory bank identified by DTR0
DTR0(1) (memory bank must be implemented and
unlocked)
IDENTIFY DEVICE(1) 0x25 Instructs a control gear to run an
identification procedure
SET MAX LEVEL DTR0 0x2A Configures the control gear's maximum
output level to the value stored in DTR0
SET MIN LEVEL DTR0 0x2B Configures the control gear's minimum
output level to the value stored in DTR0
SET SYSTEM FAILURE LEVEL 0x2C Sets the control gear's output level in the
DTR0 event of a system failure to the value stored
in DTR0
SET POWER ON LEVEL DTR0 0x2D Configures the output level upon power-up
based on the value of DTR0
SET FADE TIME DTR0 0x2E Sets the fade time based on the value of
DTR0
SET FADE RATE DTR0 0x2F Sets the fade rate based on the value of
DTR0
SET EXTENDED FADE TIME 0x30 Sets the extended fade rate based on the
DTR0(1) value of DTR0; used when fade time = 0

SET SCENE 0x40 Configures scene 'x' based on the value of

DTR0
REMOVE FROM SCENE 0x50 Removes one of the control gears from a
scene
ADD TO GROUP 0x60 Adds a control gear to a group
REMOVE FROM GROUP 0x70 Removes a control gear from a group
SET SHORT ADDRESS DTR0 0x80 Sets a control gear's short address to the
value of DTR0
ENABLE WRITE MEMORY 0x81 Allows writing into memory banks
QUERY INSTRUCTIONS
QUERY STATUS 0x90 Determines the control gear's status based
on a combination of gear properties
QUERY CONTROL GEAR 0x91 Determines if a control gear is present
PRESENT
QUERY LAMP FAILURE 0x92 Determines if a lamp has failed
QUERY LAMP POWER ON 0x93 Determines if a lamp is On
QUERY LIMIT ERROR 0x94 Determines if the requested target level has
been modified due to max. or min. level
limitations

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DALI Commands

QUERY RESET STATE 0x95 Determines if all NVM variables are in their
Reset state
QUERY MISSING SHORT 0x96 Determines if a control gear's address is
ADDRESS equal to 0xFF
QUERY VERSION NUMBER 0x97 Returns the device's version number located
in memory bank 0, location 0x16
QUERY CONTENT DTR0 0x98 Returns the value of DTR0
QUERY DEVICE TYPE 0x99 Determines the device type supported by the
control gear
QUERY PHYSICAL MINIMUM 0x9A Returns the minimum light output that the
control gear can operate at
QUERY POWER FAILURE 0x9B Determines if an external power cycle
occurred
QUERY CONTENT DTR1 0x9C Returns the value of DTR1
QUERY CONTENT DTR2 0x9D Returns the value of DTR2
QUERY OPERATING MODE(1) 0x9E Determines the control gear's operating
mode
QUERY LIGHT SOURCE 0x9F Returns the control gear's type of light source
TYPE(1)
QUERY ACTUAL LEVEL 0xA0 Returns the control gear's actual power
output level
QUERY MAX LEVEL 0xA1 Returns the control gear's maximum output
setting
QUERY MIN LEVEL 0xA2 Returns the control gear's minimum output
setting
QUERY POWER ON LEVEL 0xA3 Returns the value of the intensity level upon
power-up
QUERY SYSTEM FAILURE 0xA4 Returns the value of the intensity level due to
LEVEL a system failure
QUERY FADE TIME FADE RATE 0xA5 Returns a byte in which the upper nibble is
equal to the fade time value and the lower
nibble is the fade rate value
QUERY MANUFACTURER 0xA6 Returns a 'YES' when the operating mode is
SPECIFIC MODE(1) within the range of 0x80 - 0xFF
QUERY NEXT DEVICE TYPE(1) 0xA7 Determines if the control gear has more than
one feature, and if so, return the first/next
device type or feature

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DALI Commands

QUERY EXTENDED FADE 0xA8 Returns a byte in which bits 6-4 is the value
TIME(1) of the extended fade time multiplier and the
lower nibble is the extended fade time base
QUERY CONTROL GEAR 0xAA Determines if a control gear has failed
FAILURE(1)
QUERY SCENE LEVEL 0xB0 Returns the level value of scene 'x'
QUERY GROUPS 0-7 0xC0 Returns a byte in which each bit represents a
member of a group. A '1' represents a
member of the group
QUERY GROUPS 8-15 0xC1 Returns a byte in which each bit represents a
member of a group. A '1' represents a
member of the group
QUERY RANDOM ADDRESS H 0xC2 Returns the upper byte of a randomly
generated address
QUERY RANDOM ADDRESS M 0xC3 Returns the high byte of a randomly
generated address
QUERY RANDOM ADDRESS L 0xC4 Returns the low byte of a randomly
generated address
READ MEMORY LOCATION 0xC5 Returns the content of the memory location
stored in DTR0 that is located within the
memory bank listed in DTR1
QUERY EXTENDED VERSION 0xFF Returns the version number belonging to the
NUMBER device type or feature
SPECIAL COMMANDS
TERMINATE 0xA1 Stops the control gear's initilization
DTR0 DATA 0xA3 Loads a data byte into DTR0
INITIALISE 0xA5 Initializes a control gear, command must be
issued twice
RANDOMIZE 0xA7 Generates a random address value,
command must be issued twice
COMPARE 0xA9 Compares the random address variable to
the search address variable
WITHDRAW 0xAB Changes the initialization state to reflect that
a control gear had been identified but
remains in the initialization state
PING(1) 0xAD Used by control devices to indicate theirm
presence on the bus
SEARCH ADDRH 0xB1 Determines if an address is present on the
bus

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DALI Commands

SEARCH ADDRM 0xB3 Determines if an address is present on the

bus
SEARCH ADDRL 0xB5 Determines if an address is present on the
bus
PROGRAM SHORT ADDRESS 0xB7 Programs a control gear's short address
VERIFY SHORT ADDRESS 0xB9 Verifies if a control gear's short address is
correct
QUERY SHORT ADDRESS 0xBB Queries a control gear's short address
ENABLE DEVICE TYPE 0xC1 Enables a control gear's device type function
DTR1 DATA 0xC3 Loads a data byte into DTR1
DTR2 DATA 0xC5 Loads a data byte into DTR2
WRITE MEMORY LOCATION 0xC7 Writes data into a specific memory location
and returns the value of the data written
WRITE MEMORY LOCATION 0xC9 Writes data into a specific memory location
NO REPLY(1) but does not return a response

Note 1: Addition commands introduced in DALI 2.0.

© 2018 Microchip Technology Inc. DS90003200A-page 16

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The Microchip Web Site

Microchip provides online support via our web site at http://www.microchip.com/. This web site is used as
a means to make files and information easily available to customers. Accessible by using your favorite
Internet browser, the web site contains the following information:
• Product Support – Data sheets and errata, application notes and sample programs, design
resources, user’s guides and hardware support documents, latest software releases and archived
software
• General Technical Support – Frequently Asked Questions (FAQ), technical support requests,
online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases,
listing of seminars and events, listings of Microchip sales offices, distributors and factory
representatives

Customer Change Notification Service

Microchip’s customer notification service helps keep customers current on Microchip products.
Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata
related to a specified product family or development tool of interest.
To register, access the Microchip web site at http://www.microchip.com/. Under “Support”, click on
“Customer Change Notification” and follow the registration instructions.

Customer Support
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
Customers should contact their distributor, representative or Field Application Engineer (FAE) for support.
Local sales offices are also available to help customers. A listing of sales offices and locations is included
in the back of this document.
Technical support is available through the web site at: http://www.microchip.com/support

Microchip Devices Code Protection Feature

Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the
market today, when used in the intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of
these methods, to our knowledge, require using the Microchip products in a manner outside the
operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is
engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.

© 2018 Microchip Technology Inc. DS90003200A-page 17

 TB3200

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their
code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the
code protection features of our products. Attempts to break Microchip’s code protection feature may be a
violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software
or other copyrighted work, you may have a right to sue for relief under that Act.

Legal Notice
Information contained in this publication regarding device applications and the like is provided only for
your convenience and may be superseded by updates. It is your responsibility to ensure that your
application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY
OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS
CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE.
Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life
support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend,
indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting
from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual
property rights unless otherwise stated.

Trademarks
The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings,
BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, KeeLoq logo,
Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB,
OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA,
SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other countries.
ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight
Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom,
chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController,
dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial
Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi,
motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient
Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL
ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total
Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are
trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of
Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their respective companies.

© 2018 Microchip Technology Inc. DS90003200A-page 18

 TB3200

© 2018, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
ISBN: 978-1-5224-3121-3

Quality Management System Certified by DNV

ISO/TS 16949
Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer
fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California
® ®
and India. The Company’s quality system processes and procedures are for its PIC MCUs and dsPIC
®
DSCs, KEELOQ code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design and manufacture of development
systems is ISO 9001:2000 certified.

© 2018 Microchip Technology Inc. DS90003200A-page 19

 Worldwide Sales and Service

AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE

Corporate Office Australia - Sydney India - Bangalore Austria - Wels
2355 West Chandler Blvd. Tel: 61-2-9868-6733 Tel: 91-80-3090-4444 Tel: 43-7242-2244-39
Chandler, AZ 85224-6199 China - Beijing India - New Delhi Fax: 43-7242-2244-393
Tel: 480-792-7200 Tel: 86-10-8569-7000 Tel: 91-11-4160-8631 Denmark - Copenhagen
Fax: 480-792-7277 China - Chengdu India - Pune Tel: 45-4450-2828
Technical Support: Tel: 86-28-8665-5511 Tel: 91-20-4121-0141 Fax: 45-4485-2829
http://www.microchip.com/ China - Chongqing Japan - Osaka Finland - Espoo
support Tel: 86-23-8980-9588 Tel: 81-6-6152-7160 Tel: 358-9-4520-820
Web Address: China - Dongguan Japan - Tokyo France - Paris
www.microchip.com Tel: 86-769-8702-9880 Tel: 81-3-6880- 3770 Tel: 33-1-69-53-63-20
Atlanta China - Guangzhou Korea - Daegu Fax: 33-1-69-30-90-79
Duluth, GA Tel: 86-20-8755-8029 Tel: 82-53-744-4301 Germany - Garching
Tel: 678-957-9614 China - Hangzhou Korea - Seoul Tel: 49-8931-9700
Fax: 678-957-1455 Tel: 86-571-8792-8115 Tel: 82-2-554-7200 Germany - Haan
Austin, TX China - Hong Kong SAR Malaysia - Kuala Lumpur Tel: 49-2129-3766400
Tel: 512-257-3370 Tel: 852-2943-5100 Tel: 60-3-7651-7906 Germany - Heilbronn
Boston China - Nanjing Malaysia - Penang Tel: 49-7131-67-3636
Westborough, MA Tel: 86-25-8473-2460 Tel: 60-4-227-8870 Germany - Karlsruhe
Tel: 774-760-0087 China - Qingdao Philippines - Manila Tel: 49-721-625370
Fax: 774-760-0088 Tel: 86-532-8502-7355 Tel: 63-2-634-9065 Germany - Munich
Chicago China - Shanghai Singapore Tel: 49-89-627-144-0
Itasca, IL Tel: 86-21-3326-8000 Tel: 65-6334-8870 Fax: 49-89-627-144-44
Tel: 630-285-0071 China - Shenyang Taiwan - Hsin Chu Germany - Rosenheim
Fax: 630-285-0075 Tel: 86-24-2334-2829 Tel: 886-3-577-8366 Tel: 49-8031-354-560
Dallas China - Shenzhen Taiwan - Kaohsiung Israel - Ra’anana
Addison, TX Tel: 86-755-8864-2200 Tel: 886-7-213-7830 Tel: 972-9-744-7705
Tel: 972-818-7423 China - Suzhou Taiwan - Taipei Italy - Milan
Fax: 972-818-2924 Tel: 86-186-6233-1526 Tel: 886-2-2508-8600 Tel: 39-0331-742611
Detroit China - Wuhan Thailand - Bangkok Fax: 39-0331-466781
Novi, MI Tel: 86-27-5980-5300 Tel: 66-2-694-1351 Italy - Padova
Tel: 248-848-4000 China - Xian Vietnam - Ho Chi Minh Tel: 39-049-7625286
Houston, TX Tel: 86-29-8833-7252 Tel: 84-28-5448-2100 Netherlands - Drunen
Tel: 281-894-5983 China - Xiamen Tel: 31-416-690399
Indianapolis Tel: 86-592-2388138 Fax: 31-416-690340
Noblesville, IN China - Zhuhai Norway - Trondheim
Tel: 317-773-8323 Tel: 86-756-3210040 Tel: 47-7289-7561
Fax: 317-773-5453 Poland - Warsaw
Tel: 317-536-2380 Tel: 48-22-3325737
Los Angeles Romania - Bucharest
Mission Viejo, CA Tel: 40-21-407-87-50
Tel: 949-462-9523 Spain - Madrid
Fax: 949-462-9608 Tel: 34-91-708-08-90
Tel: 951-273-7800 Fax: 34-91-708-08-91
Raleigh, NC Sweden - Gothenberg
Tel: 919-844-7510 Tel: 46-31-704-60-40
New York, NY Sweden - Stockholm
Tel: 631-435-6000 Tel: 46-8-5090-4654
San Jose, CA UK - Wokingham
Tel: 408-735-9110 Tel: 44-118-921-5800
Tel: 408-436-4270 Fax: 44-118-921-5820
Canada - Toronto
Tel: 905-695-1980
Fax: 905-695-2078

© 2018 Microchip Technology Inc. DS90003200A-page 20