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Making Hardware Connections
Manual Documentation Number: ESP901-902_0508m 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