RS232/RS422 CONVERTER
The RS232/RS422 converter provides a RS232 signal to a RS422 signal conversion feature, which is used to expand long hung communication distance via RS422 signal. The expandable transmission distance for a RS232/RS422 converter is 3000ft.

The features of RS232/RS422 converter are :
RS232 to RS422 / RS422 to RS232 converter.
Asynchronous communication protocol.
Each converter extends up to 3000ft communication distance.
Standard EIA RS232 / EIA RS422 interface.
Several converters can be treated as repeaters for connecting to a long connumication distance.
AC power supported for 110V/220V selectable.
LED indicates when converter is operating.
LED indicates when power is in normal mode.

The package contains:
RS232/RS422 converter.
AC power adapter.
User's manual.

Hardware 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 softward.

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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