Technical data

RS-485 Connections
ESR90x DB-9 Pin-out in RS-485F (four-wire, full duplex) 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 54. RS-422 Connections in a DB-9 Connector
N
N
o
o
t
t
e
e
:
:
Some RS-485 devices are marked opposite the RS-485 standard, which
defines the Data B line as positive relative to Data A during a Mark state before
enabling the transmitter, and after transmitting before tri-stating. If an RS-485
device does not respond, try swapping the Data B and Data A lines.
Manual Documentation Number: ESR90x-1705m Appendix C 75
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
ESR901 Terminal Block Pin-out in RS-485F (four-wire, full duplex) 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 55. ESR901 Terminal Block Pin-out in RS-232 Mode
76 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