Serial Pin-outs: Difference between revisions
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This cable uses the Sun pinout, with a minor modification: the two GND wires are connected straight through. With DB9<->8P8C modular jacks, you cannot connect the DB9 GND to both GND pins of the 8P8C end (i.e., you can't stick two pins in one hole). Connecting using a standard rollover is fine when connecting e.g. the Netra to a DB9, but if two DB9s are connected via a standard rollover, GND will be an open circuit. The "almost" rollover connects the two GND lines straight through to avoid this problem. The module jacks we have now use 8P8C pin 4 for GND. |
This cable uses the Sun pinout, with a minor modification: the two GND wires are connected straight through. With DB9<->8P8C modular jacks, you cannot connect the DB9 GND to both GND pins of the 8P8C end (i.e., you can't stick two pins in one hole). Connecting using a standard rollover is fine when connecting e.g. the Netra to a DB9, but if two DB9s are connected via a standard rollover, GND will be an open circuit. The "almost" rollover connects the two GND lines straight through to avoid this problem. The module jacks we have now use 8P8C pin 4 for GND. |
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The two cables we have with this pinout are labeled "Serial 87645321". |
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===Half-Cables === |
===Half-Cables === |
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Revision as of 22:24, 24 April 2008
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 (2 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, Female
| 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, Female
| DB25 | 8P8C |
| 2 | 3 |
| 3 | 4 |
| 4 | 8 |
| 5 | 1 |
| 6 | 7 |
| 7 | 5 |
| 7 | 6 |
| 8 | 7 |
| 20 | 2 |
DB25 to 8P8C Adapter, Male
| DB25 | 8P8C |
| 2 | 6 |
| 3 | 8 |
| 4 | 5 |
| 5 | 4 |
| 6 | 1 |
| 7 | 3 |
| 7 | 7 |
| 20 | 2 |
Dumbterm Cable
| DE9 | 8P8C | 8P8C | DB25 | |
| DCD | 1 | 6 | 7 | 8 |
| RXD | 2 | 1 | 4 | 3 |
| TXD | 3 | 5 | 3 | 2 |
| DTR | 4 | 4 | 2 | 20 |
| GND | 5 | 2 | 5 | 7 |
| DSR | 6 | 3 | X | 6 |
| RTS | 7 | 7 | 8 | 4 |
| CTS | 8 | 8 | 1 | 5 |
| DE9 end | DB25 end | |
| 1 | Gr/W | Br |
| 2 | Gr | Bl |
| 3 | Or/W | Bl/W |
| 4 | Bl | Gr/W |
| 5 | Bl/W | Gr |
| 6 | Or | X |
| 7 | Br/W | Or |
| 8 | Br | Br/W |
Almost Rollover Cable
| 8P8C | 8P8C |
| 1 | 8 |
| 2 | 7 |
| 3 | 6 |
| 4 | 4 |
| 5 | 5 |
| 6 | 3 |
| 7 | 2 |
| 8 | 1 |
This cable uses the Sun pinout, with a minor modification: the two GND wires are connected straight through. With DB9<->8P8C modular jacks, you cannot connect the DB9 GND to both GND pins of the 8P8C end (i.e., you can't stick two pins in one hole). Connecting using a standard rollover is fine when connecting e.g. the Netra to a DB9, but if two DB9s are connected via a standard rollover, GND will be an open circuit. The "almost" rollover connects the two GND lines straight through to avoid this problem. The module jacks we have now use 8P8C pin 4 for GND.
The two cables we have with this pinout are labeled "Serial 87645321".
Half-Cables
Light Serial Mouse
2 green
3 brown
4 pink
5 yellow
7 white
Dark Serial Mouse
2 white
3 light brown
4 brown
5 black
7 blue
Metal End
2 green
3 yellow
5 black
6 red
7 brown
8 white