RS232 to RS422 Converter Configuration

1. Block Diagram

Observe the figure shown in the following, the converter contains three LED indicators, LED1 indicates power status, when LED1 is light means power is in normal mode, LED2 indicates transmission data of RS232 signal and LED3 indicates transmission data of RSS422 signal.

2. Signal Assignment

The signal assignment of RS232 to RS422 converter is shown in the following.

RS232 Pin NO.   Description Description RS422 Pin NO.   2 TXD TXD(-) TXD(+) 14 2 3 RXD RXD(-) RXD(+) 15 3 4 RTS RTS(-) RTS(+) 16 4 5 CTS CTS(-) CTS(+) 17 5 6 DSR DSR(-) DSR(+) 18 6 7 GND GND 7 8 DCD DCD(-) DCD(+) 19 8 10   CTRL1(-) CTRL1(+) 21 10 12 CTRL2     20 DTR DTR(-) DTR(+) 9 20

CTRL1 is the empty I/P for user and CTRL2 is in normal active when it is floating and it could be controlled active or nonactive by software.

The signal assignment of a standard DB25 connector for RS232 is shown in the following.

DB25 Pin #   Signal Name   RS-232C Name   Signal Direction 1   Chassis Ground (GND) AA Common   2   Transmit Data (TxD) BA Output 3   Receive Data (RxD) BB Input   4   Request to Send (RTS) CA Output 5   Clear to Send (CTS) CB Input 6   Data Set Ready   (DSR)   CC   Input   7   Signal Groud   (SG)   AB   Common   8   Data Carrier Detect   (DCD)*   CF   Input   20   Data Terminal Ready   (DTR)   CD   Output   22   Ring Indicator   (RI)   CE   Input

* Data Carrier Detect (DCD) is also known as Received Line Signal Detector (RLSD).

There are several system configurations for different applications.

3. System Configuration

A. Communication between RS232 and RS232

To connect your repeater to  DATA TERMINAL EQUIPMENT (DTE), we suggest the following connection.

B. Communication between RS232 and RS422