Documentation Number: ESP902-2303 Manual
Appendix C
C-1
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
APPENDIX C: RS-422 CONNECTIONS
RS-422 Connections
RS-422
Signal Name
Direction
RS-422 DB9M
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
