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RS-422 Connections
Manual Documentation Number: ESR90x-0508m Appendix B 73
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
ESR901 Terminal Block Pin-out in RS-422 Mode
G
N
D
C
T
S
/
T
X
-
T
X
/
T
X
+
R
X
/
R
X
+
RT
S
/
R
X
-
1
2
3
4
5
Signal Name RS-422 Direction Terminal
Signal Ground GND --- 1
Transmit Data (-) TXD(-) Out 2
Transmit Data (+) TXD(+) Out 3
Receive Data (+) RXD(+) In 4
Receive Data (-) RXD(-) In 5
Figure 52. ESR901 Terminal Block Pin-out in RS-232 Mode
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.