RS232 to RS422 PHOTO ISOLATOR BOX
The RS232 to RS422 photo isolator box allows the input signals to be completely prevent up to 1000V. There are 3 LED indicators correspond to Tx, Rx, and power signals. A 9V, 500mA power adapter is provided in the package.

There are one RS422 male connector and one RS232 female connectors in  the box, the signal assignments are shown below:
1. Female RS232 signals
DB25 Pin#
Signal Name
RS-232 Signal name
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
7 Signal Ground (SG)
AB
Common

2. Male RS422 signals
DB25 Pin#
Signal Name
Direction
1
Chassis Ground (GND)
Common
2
Transmit Data (TxD)
Output
3
Receive Data (RxD+)
Input
4
Request to Send (RTS+)
Output
5
Clear to Send (CTS+)
Input
14
Transmit Data (TxD-) Output
15
Receive Data (RxD-)
Input
16
Request to Send (STR-)
Output
17
Clear to Send (CTS-)
Input

SW 1.3 ON

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