B&B Electronics ESR901, ESR902, ESR904 - page 82

RS-422 Connections
72 Appendix B Manual Documentation Number: ESR90x-0508m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
A
AP PP PE EN ND DI IX X B B: : R RS S- -4 42 22 2/ /4 48 85 5
C
CO ON NN NE EC CT TI IO ON NS S
ESR90x DB-9 Pin-out in RS-422 Mode
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
Figure 51. RS-422 Connections in a DB-9 Connector