Serial Pin-outs

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The idea is to connect pairs of systems with 2 serial cables to create a bidirectional link. We would then run a getty over one of the ports on each machine. This would allow us to login to any server if networking breaks.

The following is a list of our servers and how many serial ports they currently have:

  • caffeine (1 header)
  • natural-flavours (1 on-board)
  • artificial-flavours (1 on-board)
  • taurine (1 on-board, 1 virtual)
  • perpugilliam (2 on-board)
  • citric-acid (2 on-board)
  • potassium-citrate (2 on-board)
  • ascorbic-acid (1 on-board)

We would need the following:

  • 3 x Dual PCI Serial Port Card (PCI-2S)
  • 6 x Null-modem/Crossover Serial Cables (CB-NM9FF)

Total: $70.53

Pinouts

RS-232 over DB9

Female

 5 4 3 2 1
  9 8 7 6

Male

 1 2 3 4 5
  6 7 8 9

1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI

Serial ports on common PC hardware have this pin-out.

RS-232 over DB25

Female

 13 12 11 10 09 08 07 06 05 04 03 02 01
  25 24 23 22 21 20 19 18 17 16 15 14

Male

 01 02 03 04 05 06 07 08 09 10 11 12 13
  14 15 16 17 18 19 20 21 22 23 24 25

2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
12 SDCD
13 SCTS
14 STXD
15 TCLK
16 SRXD
17 RCLK
18 LL
19 SRTS
20 DTR
21 RL/SQ
22 RI
23 CH/CI
24 ACLK


The VT 320 has this pinout.

RS-232 over 8P8C, Sun

Top of plug

 1 2 3 4 5 6 7 8

1 RTS
2 DTR
3 TXD
4 GND
5 GND
6 RXD
7 DSR
8 CTS

The Sun Netra, ascorbic-acid, has this pinout.

DB9 to 8P8C Adapter

DB9 8P8C
1 6
2 1
3 5
4 4
5 2
6 3
7 7
8 8

The black adapter has this pinout.

DB25 to 8P8C Adapter

DB25 8P8C
2 3
3 4
4 8
5 1
6 7
7 5
7 6
8 7
20 2