Technical data

RS-422 Connections
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
+
R
T
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.
Manual Documentation Number: ESR90x-1705m Appendix B 73
B&B Electronics Mfg Co Inc – 707 Dayton Rd - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
RS-485 Connections
A
A
P
P
P
P
E
E
N
N
D
D
I
I
X
X
C
C
:
:
R
R
S
S
-
-
4
4
8
8
5
5
C
C
O
O
N
N
N
N
E
E
C
C
T
T
I
I
O
O
N
N
S
S
ESR90x DB-9 Pin-out in RS-485H (two-wire, half duplex) Mode
RS-485
Signal Name
Direction RS-485 DB9M
Pin
Data B (+) In/Out DATA B (+) 3
Data A (−) In/Out DATA A (−) 4
Signal Ground --- GND 5
Figure 53. DB-9 Pin-out in RS-485 Mode
74 Appendix C Manual Documentation Number: ESR90x-1705m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com