Cat5 Null Modem CableOriginal idea, original post, more details Serial DB9/RJ45 Adapter
DB9 pin signal RJ45 pin color
------- ------ -------- -----
1 DCD 8 white
2 RxD 3 black
3 TxD 1 blue
4 DTR 5 green
5 SG 2,6 orange, yellow
6 DSR 8 white
7 RTS 4 red
8 CTS 7 brown
9 RI none
Reversed (null-modem) DB9/RJ45 Adapter
DB9 pin signal RJ45 pin color
------- ------ -------- -----
1 DCD 5 green
2 RxD 1 blue
3 TxD 3 black
4 DTR 8 white
5 SG 2,6 orange, yellow
6 DSR 5 green
7 RTS 7 brown
8 CTS 4 red
9 RI none
Reversed (null-modem) DB9/RJ45 Adapter w/Loopback
DB9 pin signals RJ45 pin colors
------- -------------- -------- -----------
2 RxD 1 blue
3 TxD 3 black
5 SG 2,6 orange, yellow
9 RI
1,4,6 DCD, DTR, DSR connected
7,8 RTS,CTS connected
DCD, DTR, DSR 5,8 green, white connected
RTS,CTS 4,7 red, brown connected
This is useful for things (like IBM AIX boxen) that insist on proper hardware flow control... so we fake it. We're looping both ends from this adapter to we can use a "standard" DB9/RJ45 on the other end. see also: http://www.lammertbies.nl/comm/info/RS-232_null_modem.html. Reversed (null-modem) MMJ(M)/RJ45(F) Adapter
MMJ pin MMJ signal RJ45 pin
------- ---------- --------
1 DTR 8
2 TxD+ 3
3 TxD- 2 / 6
4 RxD- 2 / 6
5 RxD+ 1
6 DSR 5
RTS (4)
CTS (7)
This is useful for DEC equipment having only a DECconnect/MMJ jack. For MMJ, pin 6 is always the edge with the "key". Colors will run either (blue, black, orange, red, green, white) or (white, green, red, orange, black, blue). see also: http://www.lammertbies.nl/comm/cable/dec-mmj.html. see also: http://h71000.www7.hp.com/wizard/padapters.html Reversed (null-modem) RJ11(M)/RJ45(F) Adapter
RJ11 pin RJ11 signal RJ45 pin
-------- ----------- --------
1 DTR 8
2 TxD+ 3
3 TxD- 2 / 6
4 RxD- 2 / 6
5 RxD+ 1
6 DSR 5
RTS (4)
CTS (7)
This is for DEC equipment having an RJ11 jack instead of a DECconnect/MMJ jack, such as HSG80s. Pin 1 of the RJ11 plug is on the left-hand side as it get's plugged in.
date: 05/23/2006 |
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