RS-232 to RS-485 Converter

In order to carry through remote digital communication between computers with various standard series interfaces converter facilities or intelligent instruments, it needs inter exchange of standard series interface converter of compatible RS-232Cand RS-485 standard is able to convert mono-end RS-232 signal to balance difference RS-485 signal and extend the communication distance to1.2km. No external power but adopts a particular RS-232 charge pump to drive the system, and gains electricity without initializing the RS-232 series interface. An internal zero delay auto transceiver and particular I/O circuit automatically control the data stream direction in stead of an handshake signal (for example  RTS,DTR etc).There by in guarantees the function under RS-485 without changing the program compiled under RS-232 half-duplex mode and assures the adaptation to current operation software and interface hardware. The transmission rate is 300-115.2kbps. Is capable of applying between host computers, host computer and is extensions or external equipment and forms dot to dot, dot to dots remote and multi-communication network, It implements multi-machine response communication and commonly used in systems of industrial automation control all-one-card, door safe, car parking, ATM, bus charge, eatery sell out, staff attendance management, and toll highway etc.

The product exterior adopts DB-9 to 3Pin all-purpose transit plugs, output plug carries ordinary connection pole, can use TP or STP and easy connection and disassembly, T/R+, T/R- stands for dispatching  A+, B-, VCC stands for standby power input, GND stands for public ground wire, Point-to-point or point-to-multipoint, half-duplex communication need 2 connection (T/R+、T/R-). Connection principle is  T/R+ connects to opposite T/R+, T/R- connects to opposite T/R-,RS-485 half-duplex mode connection is to connect T/R+ to opposite A+, and T/R-to opposite B-.

Remark: A+ for (485+), B- for (485-)

UT-2011 interface supports 2 communication modes as below:
1.  Point-to-point  2 wires half-duplex
2.  point-to-multipoint 2 wires half-duplex

When converter works under half-duplex connection, it needs to install a matching resistance (data 120 ohm 1/4W) for preventing signal reflection and interference.

UT-2011 User Manual