Serial Pin-outs
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 |