APPENDIX B: RS-422 CONNECTIONS
Serial Server DB-9 Pin-outs in RS-422 Mode
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| DB9M | |
Signal Name | Direction | Pin | |
Receive Data A (−) | In | RXDA (−) | 1 |
Receive Data B (+) | In | RXDB (+) | 2 |
Transmit Data B (+) | Out | TXDB (+) | 3 |
Transmit Data A (−) | Out | TXDA (−) | 4 |
Signal Ground | GND | 5 | |
Clear to Send A (−) | In | CTSA (−) | 6 |
Clear to Send B (+) | In | CTSB (+) | 7 |
Request to Send B (+) | Out | RTSB (+) | 8 |
Request to Send A (−) | Out | RTSA (−) | 9 |
Figure 66. RS-422 Connections in a DB-9 Connector
Manual Documentation Number: | Appendix B | 75 |
Serial Server |
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in |
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| Device | |
Connections | Signal | |||
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| Pin# |
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Receive A | 1 |
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Receive B (+) | RXDB(+) | 2 |
| TDB(+) |
Transmit B (+) | TXDB(+) | 3 |
| RDB(+) |
Transmit A | 4 |
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Ground | GND | 5 |
| GND |
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Clear to Send A | 6 |
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Clear to Send B (+) | CTSB(+) | 7 |
| RTSB(+) |
Ready to Send B (+) | RTSB(+) | 8 |
| CTSB(+) |
Ready to Send A | 9 |
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Figure 67. RS-422 Connections with Flow Control
In the
If Flow Control is set for RTS/CTS, connect the Serial Server RTSB(+) to CTSB(+) of the serial device and the Serial Server
If connecting to Receive Only
Ground is signal ground and provides a common mode reference for the
Note:
The
76 | Appendix B | Manual Documentation Number: |
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