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Serial RS-232

Serial RS-232

EIA-561

November 16, 2007

Use this pinout with any ethernet cable for RS-232 on RJ45 connectors, courtesy of this blog

 pair     4-pair     RJ-45  color   DB9  DB25  signal  circuit  DTE  DCE
-----------------------------------------------------------------------
1 blue/white 4 red 5 7 SG AB - -
1 white/blue 5 green 2 3 RD BB in out
2 white/orange 3 black 4 20 DTR CD out in
2 orange/white 6 yellow 3 2 TD BA out in
3 white/green 1 blue 9 22 RI CE in out
3 green/white 2 orange 1 8 DCD CF in out
4 white/brown 7 brown 8 5 CTS CB in out
4 brown/white 8 white 7 4 RTS CA out in
- - - - 6 6 DSR CC in out

column legend:
pair = twisted pair number in standard 4-pair cable
4-pair = base/stripe colors in standard 4-pair cable
RJ-45 = pin number
color = wire color on standard RJ-45 connector
DB9 = pin number
DB25 = pin number
signal = EIA signal name (abbreviated form)
circuit = EIA circuit designation
DTE = electrical input or output for Data Terminal Equipment (PC)
DCE = electrical input or output for Data Communications Equipment (modem)