RS-232 over CAT-5 cable

This is the standard used in CLO 363+365:

DB9 pin CAT5 color RJ-45 pin function Monoprice Adapter Color
1 orange 2 DCD = Data Carrier Detect Orange
2 blue-white 5 RxD = Receive Data Green
3 green 6 TxD = Transmit Data Yellow
4 green-white 3 DTR = Data Terminal Ready Black
5 blue 4 SGND = Ground Red
6 orange-white 1 DSR = Data Set Ready Blue
7 brown 8 RTS = Request To Send White
8 brown-white 7 CTS = Clear To Send Brown
9 n/c (or orange-white) n/c (or 1) RI = Ring Indicator n/c

(based on T568B)

Null modem (based on RJ-45 Wiring)

CAT5 color RJ-45 pin (normal side) function function (null modem side) RJ-45 pin (null modem side)
green-white 3 DTR = Data Terminal Ready DSR = Data Set Ready 1
orange 2 DCD = Data Carrier Detect n/c n/c
orange-white 1 DSR = Data Set Ready DTR = Data Terminal Ready 3
blue 4 SGND = Ground SGND = Ground 4
green 6 TxD = Transmit Data RxD = Receive Data 5
blue-white 5 RxD = Receive Data TxD = Transmit Data 6
brown 8 RTS = Request To Send CTS = Clear To Send 7
brown-white 7 CTS = Clear To Send RTS = Request To Send 8

See Also

Cisco adapter

DB9 pin CAT5 color RJ-45 pin function
1 n/c n/c DCD = Data Carrier Detect
2 green 6 RxD = Receive Data
3 green-white 3 TxD = Transmit Data
4 orange 2 DTR = Data Terminal Ready
5 blue 4,5 SGND = Ground
6 brown-white 7 DSR = Data Set Ready
7 orange-white 1 RTS = Request To Send
8 brown 8 CTS = Clear To Send
9 n/c n/c RI = Ring Indicator

(based on T568B)

See Also

electronics/rs232_over_cat5.txt · Last modified: 2016/08/04 19:39 by tdobes
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