APPLICATION NOTE

Using Modems with Sound Level Meters

Sound Level Meters are often used for

monitoring in remote places, and you
may want to “monitor the monitor” or
transfer measured data to your home-
base PC, without going to the measure-
ment site. A telephone connection —
wired or wireless — is a convenient way
to transfer measurement data. And mo-
dems are a vital link in the chain of trans-
mission. This application note explains
what equipment you need and how to
use it.

Please note that only Brüel & Kjær Types

2236 and 2260 are supported for modem
connection. Types 2231, 2237 and 4436
need special handshaking modes, which
cannot be activated via modem.
Using Modems with Sound Level Meters

2260 Semi-permanent Monitoring Kit

A sound level meter for monitoring in the field needs protection against
weather and tampering, and it needs a power supply other than its
internal batteries. Also, you need space and power for the modem.
For the Investigator Sound Level Analyzer Type 2260, the 2260 Semi-
permanent Monitoring Kit is available. It includes a weatherproof case,
12 V battery, battery charger, cables, Outdoor Microphone Kit and soft-
ware for Type 2260 and for the PC. The case has room for all the
equipment including a modem, and it has a cable entry for feeding
external power to the system. A complete system including the 2260 is
also available: the 2260 Semi-permanent Monitoring System has all the
equipment in the Kit, plus the 2260, a calibrator, a tripod and an inter-
face cable for a PC. For ordering information, see the “Noise Monitoring”
System Summary sheet (BU 3063).
Fig. 1 2260 Semi-permanent Monitoring
System

2
Standard Modems

This section shows how to capture sound measurements from a remote

Sound Level Analyzer (Investigator Type 2260) via telephone lines and
standard modems. Precision Integrating Sound Level Meter Type 2236
may also be used.
The field equipment is illustrated in Fig. 2.

Fig. 2 Field equipment shown with

standard modem. The telephone line
connector is shown in the lid

3
Fig. 3 Standard modem set-up

B&K 2236
or 2260
Hayes ¤ Compatible
PC running Modem
Evaluator
Type 7820

Dumb Auto
Answer Modem
(Multitech MT 2834ZDX)

980001e

Fig. 4 shows the complete system including the home-base modem.

Fig. 4 System diagram. The diagram

does not include the optional DAT re- Mains Power
corder
Mains Power Supply Mains Adaptor
Outdoor Microphone Kit UA 1404
ZG 0386 (EU) (included with
(Preamplifier ZG 0026 and
ZG 0387 (UK) Multitech Modem)
Microphone 4189, from 2260)
ZG 0388 (US)
Microphone Extension Cable
AO 0441 (3m) Sound Level Analyzer
AO 0442 (10m) Type 2260

Type 2260
0
dB

Brüel & Kjær

?

Tripod
Lightweight MT2834ZDX
UA 0587
Tripod Field modem
UA 0801 Cable for Multitech
+ – 12V Supply

Panasonic
dflkfpojmmljflkjgjrg
grmowjgfpktjpw
Battery Charger
ZG 0404
12V Battery
QB 0051
Case Type 3592

Sound Level
Calibrator 4231 Home-base Modem
TOSHIBA

Hayes ® compatible
Telephone
Evaluator 7820 system
Community noise
calculations Notebook/PC
970551e

Standard Modems — Field Modem

The modem used in the field must be intelligent enough to provide

error correction, but dumb enough not to interpret any of the commu-
nication nor to add anything by sending messages to the sound level
meter (see APPENDIX 1: Selection of Field Modem).
Testing a number of modems, Brüel & Kjær has found the Multitech
MT2834ZDX to be the best choice, and recommends only that for field
use.
Brüel & Kjær does not provide technical support for other modems.

4
Table 1 Equipment Equipment Type Available From

PC operating system Windows 95®, PC supplier

Windows NT4.0®,
Windows® 3.10 or 3.11

PC-modem cable Depends on modem and PC Modem or PC

supplier

Home-base modem Hayes® compatible Modem supplier or

e.g. Multitech MT2834ZDX Brüel & Kjær
(ZM 0069)

Field modem Multitech MT2834ZDX Modem supplier or

Brüel & Kjær
(ZM 0069)

Modem power Mains adaptor (supplied) or Brüel & Kjær

9 V DC

SLM-modem cable AO 0567 Brüel & Kjær

SLM 2260 (or 2236) Brüel & Kjær

SLM power 12 V DC from QB 0051 or Brüel & Kjær

Mains Power Supply
ZG 0386 (EU)
ZG 0387 (UK)
ZG 0388 (US)

2260 Semi- BZ 7202–302 (English) Brüel & Kjær

permanent BZ 7202–303 (French)
Monitoring Kit BZ 7202–304 (German)
BZ 7202 Enhanced Sound
Analysis SW
3592 Outdoor Gear
UA 1404 Outdoor Microphone
Kit
AO 0441 Microphone
Extension Cable (3 m)
QB 0051 12 V Battery
AQ 1698 Cable for 12 V Supply
ZG 0404 Battery Charger
AQ 1700 Cable for DAT Remote
AO 0543 DAT Signal Cable
7820 – 002 Evaluator (English)
7820– 003 Evaluator (French)
7820– 004 Evaluator (German)

Lightweight Tripod UA 0801 Brüel & Kjær

Tripod UA 0587

Sound Level 4231 Brüel & Kjær

Calibrator

Setting up the Field Modem

The Multitech modem is configured from the factory to be used as a
Hayes® compatible modem together with your PC. In order to get this
modem to work in the field you must do some programming of the
modem.
Begin by connecting the Multitech modem to COM1 or COM2 on your
PC, then start the Evaluator application. Choose Options… on the Tools
menu. Next select the Modem tab. On the modem droplist select User
Defined Modem, then set the actual COM-port where you have connected
the Multitech modem. Finally set the Baud Rate to 19200.

5
 Click on the Test the connection… button to launch the Serial Commu-
nications Tool.

If your modem is properly connected to the PC, all the status indicators
except DCD should show ✓. To verify that the modem is recognized
enter the letters A and T in the String to be transmitted box and click
on the Enter button. The modem should then reply OK.
If your modem has reacted as described above, you can go on with the
programming of the modem. Enter the commands one bye one from
Table2 into the String to be transmitted box and click on the Enter
button after each command:
All 0 characters on the list are zeros. Please note that this list of com-
mands is only valid for the Multitech modem. It is not guaranteed to
work with other types of modems.
Now the Multitech modem can be connected to the SLM in the field.
Use cable AO 0567 which is a straightforward extension cable (male/

6
Table 2 Commands for the Multitech Enter command Significance
modem
ATM0 Speaker off

ATE0 No Echo

AT%E0 No Escape Sequence

ATS0=1 Answer incoming calls after first ring

AT$SB19200 Lock the baud rate to the SLM to

19200 bits/sec

ATQ1 No Result codes

AT&W0 Write the new configuration to the

modem non volatile memory

female 25-pin/9-pin cable with all lines in 1– 1 connection) — Do not use

the Brüel & Kjær AO 1386 cable in this case!

Setting up the 2236 for Modem Transfer

1. Press the <Show> button 9 times until the display shows INTERFACE.
2. Press the <Edit> button.
3. Press the or <Parameter> button until the display shows
19200 Baud.
4. Press the or <Level> button.
5. Press the or <Parameter> button until the display shows
Hardwire.
6. Press the <OK> button twice.
Now your 2236 has the right communication set-up and you can con-
tinue to set up the measuring parameters. As the Evaluator can only
remote control 2236 to start and stop measurements via the Autolog to
log command, you must start the initial log by specifying the sampling
interval, for example, Autolog to log every 1 min.

Setting up the 2260 for Modem Transfer

1. Press the button to enter the Setup screen.
2. Press the <Setup Menu> softkey.
3. Use the ❒ soft key to move down and select PC communication.
4. Set the baud rate to 19200.
5. Press <Save>.
After having programmed the communication parameters you must se-
lect the desired measurement set-up. Please refer to your 2260 User
Manual for information.

Standard Modems — Home-base Modem

Most modems available for use with a PC will do well for the home-
base modem. It must fulfil the following requirements:
❍ It must be Hayes compatible (supporting the AT command set)
❍ The DCD (Data Carrier Detect) line must indicate the actual connec-
tion state
❍ The modem must disconnect whenever the DTR (Data Terminal
Ready) line goes false
❍ The modem must provide correction of transmission errors

7
 Setting up the Home-base Modem
After connecting the modem to your PC using the modem-PC cable, you
can configure the PC software. If you use Windows 95 or
Windows NT4.0, you must install the modem via the control panel in
Windows first.
Start the Evaluator Type 7820. Choose Options… on the Tools menu.
Next select the Modem tab. Again if you use Windows 95 or NT4.0, your
modem is already known by the system, so all you have to do is select
it on the drop-down list.

If you want to test the connection to the modem, you can click on the
Test the connection… button, whereby you launch the Serial Communi-
cations Debugging Tool. On this screen you can test the modem connec-
tion by selecting the Test Modem in the Function box in the lower right
corner.
If you use Windows 3.10 or 3.11 or if you have problems getting your
modem to work under Windows 95/NT4.0 you should create a User
defined modem set-up in Evaluator:

8
Select the COM-port and Baud Rate. In the INIT command and in the
DIAL command you can insert any string that the software should send
to the modem during initialization and dialing. Start by putting ATZ in
the init command and ATDT in the dial command. If more than one
command is needed for initialization just put <cr> (4 letters) in as
separator, for example:
AT<cr>ATZ<cr>ATM0<cr>
Please consult your modem manual for details on the command param-
eters.

Setting up the Telephone Numbers for Dial-up Sites

Evaluator has a built-in database for keeping phone numbers for remote
sound level meters, that will be contacted by the modem connection.
This database can contain any number of sites.
To define new Dial-up Sites, Choose Options… on the Tools menu. Next
select the Dial-up Sites tab. Then click on the New Site… button. Enter
the name of the new site — any characters except \ are allowed in the
site name.
Then enter the telephone number. The Dial prefix box can be used to
add extra dialing parameters, for example, to get a line outside a local
phone system. If your system requires that you dial, for example, a 0
to get an outside line, then put 0 in the dial prefix box, otherwise leave
this box blank.
Continue this process until all sites have been defined in the database.

Dialling a Remote Site

When your field system has been set up and your home-base modem
has been connected to your PC, you can start downloading measure-
ment data from the field.

This is done the same way that you would capture data from a SLM in
direct connection with a PC, except that you put a ✓ in the box called
Connect via modem (Dial-up). When the ✓ is set in the box, the screen
will change and you will be asked to choose which remote site to dial.

9
 Once the PC has connection to the remote site, the rest of the download
process is the same as if the SLM was connected to your PC via the
AO 1386 cable.

Wireless Modem

Using a GSM dataphone, your field system becomes truly mobile and
wireless — no power line and no phone line is required. There is an
extra team player in the communication chain: the GSM network oper-
ator. But once you have got the settings right, it works as smoothly as
the data transfer via normal telephone lines.
This section shows how to capture sound measurements from a remote
sound level analyzer (Investigator Type 2260) via GSM transmission in
the field and standard telephone lines and modems at the home-base.
(Precision Integrating Sound Level Meter Type 2236 may also be used).
The field equipment is illustrated in Fig. 5.

Fig. 5 Field equipment shown with wire-

less modem. The antenna must be
placed to the right in the foam insert,
before the lid is closed

Field Equipment
Fig. 6 shows the complete system including the home-base modem.

10
Fig. 6 System diagram. The diagram
does not include the optional DAT Case Type 3592
recorder Outdoor Microphone Kit UA 1404 Field Modem
(Preamplifier ZG 0026 and Sound Level Analyzer Siemens M1
Microphone 4189, from 2260) Type 2260

Type 2260
0
dB
GSM

Br el & Kj r
?
Microphone Extension Cable SIM
Antenna
AO 0441 (3m) Card
AO 0442 (10m) 5
FLASHDISK
MB

MAGS STORAGE
SYSTEM
Enhanced Sound Handswitch ZH 0631

Analysis Software
Off
Sun isk

Tripod
On

Lightweight BZ 7202 Br el & Kj r B7/6-’89 K

UA 0587
Tripod
UA 0801 Cable for Modem Hand-
+ — 12V Supply switch ZH 0457

Panasonic
dflkfpojmmljflkjgjrg
grmowjgfpktjpw

Battery Charger
12V Battery
ZG 0404
QB 0051

Sound Level
Calibrator 4231 Home-base Modem
TOSHIBA

Hayes ¤ compatible
Telephone GSM
Evaluator 7820 system network
Community noise
calculations Notebook/PC
970556e

Fig. 7 Wireless modem set-up

PC running
Hayes ® Compatible
Evaluator
Modem
Type 7820

Brüel & Kjær 2236

or 2260

Siemens Mobile
Dataphone M1

Modem at
GSM Operator

GSM Net
Operator
970560e

2260 Semi-permanent Monitoring Kit

Please refer to the description in the Standard Modem section.

11
 Table 3 Equipment Equipment Type Available From

PC operating system Windows 95 PC supplier

Windows NT4.0
Windows 3.10 or 3.11

PC-modem cable Depends on modem and PC Modem or PC

supplier

Home-base modem Hayes compatible Modem supplier

e.g. Multitech MT2834ZDX or Brüel & Kjær
(ZM 0069)

Field modem Siemens Mobile Dataphone Siemens supplier

M1

GSM SIM Card For non-transparent data Network operator

transfer

Modem Handswitch ZH 0457 Brüel & Kjær

Antenna + mounting See section “Antenna” below Mobile-phone

supplier

SLM-Modem cable AO 1440 Brüel & Kjær

SLM 2260 (or 2236) Brüel & Kjær

2260 Semi-permanent BZ 7202 – 302 (English) Brüel & Kjær

Monitoring Kit BZ 7202 – 303 (French)
BZ 7202 – 304 (German)
BZ 7202 Enhanced Sound
Analysis SW
3592 Outdoor Gear
UA 1404 Outdoor Microphone
Kit
AO 0441 Microphone
Extension Cable (3 m)
QB 0051 12 V Battery
AQ 1698 Cable for 12 V Supply
ZG 0404 Battery Charger
AQ 1700 Cable for DAT
Remote
AO 0543 DAT Signal Cable
7820 – 002 Evaluator (English)
7820 – 003 Evaluator (French)
7820 – 004 Evaluator (German)

Lightweight Tripod UA 0801 Brüel & Kjær

Tripod UA 0587

Sound Level Calibrator 4231 Brüel & Kjær

12
Wireless Modems — Siemens M1 Mobile Dataphone

Fig. 8 Siemens M1 Mobile Dataphone At the field end we need a device

which is a combination of a mo-
bile phone and a modem. A suit-
able device is the Siemens M1 —
it runs on 12 V external DC supply,
and it has a 9–pin RS –232 inter-
face to the built-in modem which
“talks” directly to the built-in GSM
phone unit. It includes a split ca-
ble for power supply and antenna
connection.
Currently the maximum transfer
rate of this system is 9600 bits/
sec set by the network operator.
In the future the transfer rate may
increase to 19200 bits/sec (which
the M1 is designed for).

Table 4 Siemens M1 Mobile Data- Type M1 Nominal voltage 13.2 V

phone – manufacturer’s specifica-
tions Housing Plastic Input current Max. 500 mA

Dimensions 116 x 67 x 30 mm Class of III

protection

Weight 157 g Temperature, –20 to +55°C

operating

Memory Flash EPROM Temperature, – 40 to +70°C

storage

Input voltage +8 to + 24 V Antenna 50 Ω

impedance

Setting up the GSM System

SIM Card
First of all you must have a GSM SIM card in order to get access to the
GSM network. Make sure that this SIM card is set up to work with NON-
TRANSPARENT DATA TRANSFER by your network operator. Note that
the phone number for data transfer may not be the same as the phone
number normally used with this SIM card. Secondly the SIM card must
not require that a PIN code be entered before use.

Siemens M1
When ordering the Siemens M1, make sure it supports NON-TRANSPAR-
ENT data transfer. This means that the M1 firmware must be version
4.02 or later. See APPENDIX 2: Software Update for Siemens M1, for
details.
Next the M1 should be programmed for autoanswer mode. To do this
connect it to your PC on COM-1 or COM-2 and start the Evaluator
software. Choose Options… from the Tools menu. Then select the Modem
tab.
From the modem droplist select User Defined Modem. Set the actual
COM-port where you have connected the M1. Finally set the Baud Rate
to 9600.

13
 Then click on the Test the connection… button.

By entering AT and clicking on the Enter button the M1 should answer

OK.
The command AT+CSQ indicates the signal quality (a number between
0 and 31, where 31 is the best).
The command AT+COPS? shows whether you have been registered on
the network or not. It should reply with the name of your network
operator.
Now the M1 should be programmed to be in auto-answer mode with a
non-transparent error correction protocol and the result codes should
be disabled.
Enter the commands from Table5 , one by one.
After finishing programming you will notice that the M1 no longer indi-
cates OK to every command, that is because the ATQ1 command has
disabled the output of the results codes. Result codes must be disabled,
otherwise 2260 will try to interpret these messages.

14
Table 5 Siemens M1 programming Enter Command Significance
commands
ATS0= 1 Answer after 1st ring

AT\N6 Operating mode: Non-Transparent,

with RLP protocol

ATB98 Operating mode: Autobauding

Modem, 9600 Baud

ATQ1 No Result codes

AT&Y0 Load User Profile 0 at power-up

AT&W0 Write the new configuration to non-

volatile memory as User Profile 0

If you the enter AT\S you should get this status screen:

Now you can switch off the M1, position it on the remote site and
connect it to the SLM with an AO 1440 cable (which is a male/female
9-pin/9-pin RS–232 cable).

15
Wireless Modems — Modem Hand-switch ZH 0457

The Modem Hand-switch ZH 0457 serves to supply power from the 12 V

Battery QB 0051 to the Siemens M1 Mobile Dataphone.

Fig. 9 Modem Hand-switch ZH 0457

The M1 is supplied with a split cable for supply from 12 V power (and
for the antenna). The power supply cable ends in three wires: a red
(+12 V), a brown (0 V) and a violet (called “ignition”).
The Modem Hand-switch ZH 0457 provides a connector for the 12 V and
a means of switching the “ignition” since this must be done in the proper
sequence for the M1 to work.

Connecting the M1 to the ZH 0457

1. Open the ZH 0457 by removing the four screws at the bottom.
2. Take out the rubber seal and the nylon strap lying inside the ZH 0457.
3. Feed the M1 power cable (with the 3 wires) through the rubber seal
(pull the thick end through first).
4. Put the 3 wires through the hole in the ZH 0457 base.
5. Screw the red wire into the connector block opposite the red wire
already connected.
6. Screw the violet wire into the connector block opposite the violet
wire already connected.
7. Screw the brown wire into the connector block opposite the brown
wire already connected.
8. Put the rubber seal (and the cable) through the hole in the ZH 0457
base.
9. Fasten the rubber seal and cable by mounting and tightening the
nylon strap.
10.Reassemble the ZH 0457 and fasten the four screws.

Connecting the Power Supply to the M1:

The 12 V battery QB 0051 must be in charged condition and equipped
with the 12 V Cable AQ 1698.
1. Connect the ZH 0457 to the socket on the AQ 1698.
2. Make sure that the switch on the ZH 0457 is in the Off position.
3. Connect the M1 cable to the M1 Mobile Dataphone.
4. Press the switch on the ZH 0457 to select the On position — the light
in the switch should turn on.
5. The M1 is now powered from the 12 V battery.
6. To remove power from the M1, press the key on the ZH 0457 to select
the Off position.

16
 7. Wait until the green power indicator on the M1 stops flashing (it may
take up to 10 s).
8. Now the M1 cable or the 12 V connection may be disconnected.
Warning: The above sequence should always be followed, otherwise
damage may result to the M1 or the SIM card.

Battery Life
The M1 will typically consume 70 mA when in the standby mode (which
it will be most of the time). During transmission the consumption in-
creases as indicated in the table below.
Assuming consumption of 70 mA and the recommended set-up for the
2260, batttery life for the QB 0051 will be reduced by about 20%, corre-
sponding to one day.

Table 6 M1 Power Consumption at Channel

Standby Send Mode
12 V – manufacturer’s data Search

Typical Max. Typical Max.

130 mA 70 mA 150 mA 220 mA 500 mA

Antenna
The Siemens M1 Mobile Dataphone must be connected to a suitable
antenna of 50 Ω impedance. Since transmission conditions vary greatly,
it is not possible to predict the field performance of a particular antenna
design or placement. In many cases a simple antenna (the type used in
cars) is sufficient, and the non-conducting case offers some interesting
mounting features. There are generally two types of simple car antennas:
one for mounting on metal (for example on the roof) and one for mount-
ing on glass (for example a windscreen).
The type for mounting on metal (also known as a ground plane) may be
placed in the foam insert at the position normally occupied by the
tripod. Take care not to place other conductors (cables) close to the
antenna. The non-conducting case allows transmission of the GSM sig-
nal. If required, transmission can be improved by placing a ground plane
(conducting metal sheet, at least 50 × 50 cm) under this antenna.
The type for mounting on glass has two self-adhesive units to be fastened
precisely opposite each other on each side of the window (case lid for
our application). The antenna itself is clicked into the outer unit and
can be removed for transport. Fig. 10 may help in locating the two units
precisely.
Antennas designed for use in boats are available and may provide better
transmission. They do not need a ground plane.

Checking Transmission in the Field

To check transmission in the field, use a normal mobile phone and call
up the M1 (which must be connected to the 2260 and both devices
turned on). Check that the call comes through. If not, and antenna
problems are suspected, try one or a combination of the following:
❍ re-orientate the antenna
❍ move the antenna to a higher position
❍ provide a ground plane for the antenna

17
Fig. 10 Template for positioning the
parts for a car antenna (glass-mounting
type) on the inside and outside of the
case

Case lid,
internal view

95 mm
105 mm

External brace

Antenna
cable

970559e

The Home-base Modem

The home-base modem should be set up as described in the Standard
Modems — Home-base Modem section.

The SLM
The 2236 or the 2260 should be set up as as described in the Setting
up the 2236 for Modem Transfer and Setting up the 2260 for Modem
Transfer sections, except that the baud rate must be set to 9600.

APPENDIX 1: Selection of Field Modem

The modem used in the field is critical, because it must be intelligent

enough to provide error correction, but dumb enough not to interpret
any of the communication nor to add anything by sending messages
such as »CONNECT« to the sound level meter.
The requirements for the field modem can be summed up as follows:
❍ Error correction must be supported
❍ The baud rate towards the SLM must be fixed without any relation
to the baudrate used on the phoneline
❍ Hardwire handshake (RTS/CTS) must be supported
❍ The modem must not interpret any commands
❍ The modem must not send any status messages to the SLM
❍ The DCD line must indicate the actual connection state
❍ The modem must disconnect when the carrier signal disappears
❍ The modem must be able to work over an extended temperature
range
Testing a number of modems in the field, Brüel & Kjær has found the
Multitech MT2834ZDX modem to be the best choice, and recommends
that only this modem is used for field use. Brüel & Kjær does not provide
technical support for any other modem.

18
APPENDIX 2: Software Update for Siemens M1

When ordering the Siemens M1, make sure it supports NON-TRANSPAR-

ENT data transfer. This means that the M1 firmware must be version
4.02 or later. If not, you can get it from Siemens. Also you can get a
description of the new software features (Word file M1-nt2.doc) from
Siemens.
The Siemens instructions to download the new software are the follow-
ing:

Downloading New Software

The M1 consists of two hardware parts, the DSA (Data Service Adapter)
and the Mobile. Because of this the software update consists of two files:
1. DL_0_50N.EXE — software update for the DSA (test version)
2. M1_4_02N.EXE — software update for the Mobile
To update the M1 be sure that it is switched on, and that the M1 is
connected with the COM port of the PC. Then execute the two files in
the order mentioned above:
1. If the M1 is connected via the COM2 port enter: DL_0_50N -COM2
to implement the new DSA software.
For help enter: DL_0_50N -H
2. To implement the new M1 software, enter: M1_4_02N -COM2
Note: The current version of the User Guide and of the M1 software
can be found in the following mailbox:
Mailbox telephone number: +49 89 722 46555.

19
 98/02
BO 0458 –11

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