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.
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|
There
are one RS422 male connector and one RS232 female connectors in
the box, the signal assignments are shown below:
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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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