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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

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