1.

RS-485dot to dot 2 wires half-duplex

III. Connector an signal：
RS-232/RS-485 RS-232C bay-line distribution
DB9 Female RS-232C
(PIN) Interface Signal
UT-2201 Interface Converter Instruction 1 Protective
2
Ⅰ.Summary 3
RXD SIN
TXD SOUT U T-2201 RS-485machine
4 DTR
In order to carry through remote digital communication between 5 2.RS-485 dot to dots 2 wires half-duplex
GND
computers with various standard series interfaces converter 6 DSR
facilities or intelligent instruments, it needs inter exchange 7 RTS
8 CTS
of standard series interface converter of compatible RS-232C
9 RI
and RS-485 standard is able to convert mono-end RS-232 signal
to balance difference RS-485 signal and extend the communication RS-485 data output & connector and bay-line distribution
distance to 1.2km. No external power but adopts a particular
DB9 M ale RS-485machine
RS-232 charge pump to drive the system, and gains electricity without Ｄ ａ ｔ ａ Ｏｕｔｐｕｔ RS-485 H alf-Duplex UT-2201
(PIN)
initializing the RS-232 series interface. An internal zero delay auto 1 T/R+ RS-485 (A+)
transceiver and particular I/O circuit automatically control the data 2 T/R- RS-485 (B-)
stream direction in stead of an handshake signal (for example RTS, 3 RXD+ N/C
4 RXD- N/C
DTR etc).There by in guarantees the function under RS-485
5 GND Ground Wire
without changing the program compiled under RS-232
6 VCC +5V Standby Power input RS-485machine
half-duplex mode and assures the adaptation to current
IV. H ardware installation & application
operation software and interface hardware. The transmission
The product exterior adopts DB-9 to DB-9all-purpose transit
rate of 300-115.2kbps. Iscapable of applying between host computers,
plugs, output plug carries ordinary connection pole, can use TP or
host computer and is extensions or external equipment and
STPand easy connection and disassembly, T/R+、T/R- stands for
forms dot to dot, dot to dots remote and multi-communication dispatching A+、B-,VCC stands for s tandby power input, GND
network, It implements multi-machine resp onse communication standsfor public ground wire, Dot t o d o t , d o t to dots, h alf-
RS-485machine
and commonly used in systems of industrial automation control duplex communication need 2 connection (T/R+、T/R-),connection
all-one-card. Door safe, car parking, ATM, bus charge, eatery principle is T/R+ connects to opposite T/R+ 、T/R- connects t o 3.UT-2201 half-duplex communication connect between
opposite T/R-,RS-485 half-duplex mode connection is to interface converter
sell out, staff attendance management, and toll highway etc.
connect T/R+ to oppositeA+、 and T/R-toopposite B-.
Remark: A+ for (485+),B- for (485-)
II. Capabilities parameter
Interface feature: RS-232C,RS-485standard interface
compatible with EIA,TIA UT-2201 interface supports 2 communication m odes as below
Electric interface: RS-232endDB9holeconnector, RS-485 end 1、Dot to dot2wireshalf-duplex UT-2201 U T-2201
DB9 needle connector,with connection pole 2、Dot to dots 2 wires half-duplex
VI. Problem and resolution
Working mode: asynchronism half-duplex difference transmission
Transmission media: twisted -pair or STP When converter works under half-duplex connection, it 1、data communication failure
Transmission rate: 300-115.2KBPS needs to install a matching resistance (data 120 ohm 1/4W) A.Check if RS-232 interface connection is correct
for preventing signal reflection and interference. B.Check if RS-232 output connection i s correct
External discharge dimension: 63mm X33mmX17mm
Working circumstance : - 25 t o 70 degree C, relative humidity 5 % C.Check if connection ends arewellconnected
to 95% V. Communication sketch map 2、data loss or mistake
Transmission distance: 1,200m(RS-485 end),5m(RS-232 end) RS-232 to RS-485 conversion A.Check if data rate and format is consistent on both
communication end.