Appendix B RS-422 Connections | B&B Electronics RS-232, RS-485

RS-422 Connections

APPENDIX B: RS-422 CONNECTIONS

Serial Server DB-9 Pin-outs in RS-422 Mode


RS-422			DB9M
Signal Name	Direction	RS-422	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: ESP901-902_4105m

Appendix B

RS-422 Connections

Serial Server pin-out				RS-422
in RS-422 mode				Device
RS-422 Signal Names		DB-9	Connections	Signal
		Pin#
Receive A (-)	RXDA(-)	1		TDA(-)
Receive B (+)	RXDB(+)	2		TDB(+)
Transmit B (+)	TXDB(+)	3		RDB(+)
Transmit A (-)	TXDA(-)	4		RDA(-)
Ground	GND	5		GND
Ground	GND	5		GND
Clear to Send A (-)	CTSA(-)	6		RTSA(-)
Clear to Send B (+)	CTSB(+)	7		RTSB(+)
Ready to Send B (+)	RTSB(+)	8		CTSB(+)
Ready to Send A (-)	RTSA(-)	9		CTSA(-)

Figure 67. RS-422 Connections with Flow Control

In the RS-422 mode, TXD lines are outputs and RXD lines are inputs. Connect the Serial Server TXDB(+) line to the RXDB(+) line of the serial device, and the Serial Server TXDA(-) to the RXDA(-) of the serial device.

If Flow Control is set for RTS/CTS, connect the Serial Server RTSB(+) to CTSB(+) of the serial device and the Serial Server RTSA(-) line to the CTSA(-) of the serial device. Connect from the Serial Server CTSB(+) line to the RTSB(+) of the serial device and from the Serial Server CTSA(-) line to the RTSB(+) line of the serial device.

If connecting to Receive Only RS-422 devices, connect from the Serial Server TXDB(+) and TXDA(-) lines to the receive pairs on all serial devices.

Ground is signal ground and provides a common mode reference for the RS-422 Receiver and Transmitters.

Note:

The RS-422 mode can be used for full duplex 4-wire RS-485 operation provided that the serial server is acting as a sole master connecting to all the slave devices, and all slave devices share the Receive signal lines to the master. Set Flow Control for none, and omit connections to RTS/CTS line pairs.

Appendix B

Manual Documentation Number: ESP901-902_4105m

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 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 Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445	– www.bb-europe.com	B&B Electronics Ltd – Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445	– www.bb-europe.com

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