Making Hardware Connections
Manual Documentation Number: ESP901-902_5012m
Chapter 2
15
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
Serial Server Serial Port Connector Pin-outs
Pin-outs for RS-232, RS-422 and RS-485 operation are shown below.
DB-9M
Pin
RS-232
Signal Name
DTE
RS-422
RS-485
1
Carrier Detect
DCD
In
RXDA (−)
--
2
Receive Data
RXD
In
RXDB (+)
--
3
Transmit Data
TXD
Out
TXDB (+)
Data B (+)
4
Data Terminal Ready
DTR
Out
TXDA (−)
Data A (−)
5
Signal Ground
GND
---
GND
GND
6
Data Set Ready
DSR
In
CTSA (−)
--
7
Request To Send
RTS
Out
CTSB (+)
--
8
Clear To Send
CTS
In
RTSB (+)
--
9
Ring Indicator
RI
In
RTSA (−)
Figure 11.
Serial Connection Pin-outs for RS-232/RS-422/RS-485
N
N
o
o
t
t
e
e
:
:
For more information on RS-232, RS-422 and RS-485 pin-outs, cable
connections and loopback connections refer to Appendices A, B and C
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