B&B Electronics ESP904 - Manual - Manual (Page 81)

RS-422 Connections
Manual Documentation Number: ESP904-4513m Appendix B 71
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - 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 A P P P P E E N N D D I I X X B B : : R R S S - - 4 4 2 2 2 2 C C O O N N N N E E C C T T I I O O N N S S
ESP904 DB-9 Pin-outs 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 63. RS-422 Connections in a DB-9 Connector