The following tables, show some of the cable configurations I have used for serial cable setups. Sometimes this is tough to remember, especially when you dont do it for a long time (since networks are so common, and serial connections are now becoming rare).
DB9 Female to DB9 Female (using straight through standard category 5 cabling - just like 10BaseT) :
| Connector A |  |
Connector B | ||
|---|---|---|---|---|
| color | signal | pin | signal | color |
| white | DCD | 1 | DCD | black |
| red | RD | 2 | RD | yellow |
| yellow | TD | 3 | TD | red |
| black | DTR | 4 | DTR | orange |
| green | GND | 5 | GND | green |
| brown | DSR | 6 | DSR | white |
| blue | RTS | 7 | RTS | brown |
| orange | CTS | 8 | CTS | blue |
| open | RI | 9 | RI | open |
For reference, this is the way the wires are numbered inside the DB9/DB25 connectors (matching numbers to the cables orange/white wire as number 1 and 8 would be white/brown). These numbers dont correspond to the pin out numbers listed in the tables above, they are the wire numbers in the cat5 cables (try not to confuse the two issues as I once did), the real important numbers are the pinout numbers from above :
| DB9 / DB25 | |
|---|---|
| Wiire Number | Wire Color |
| 1 | blue |
| 2 | orange |
| 3 | black |
| 4 | red |
| 5 | green |
| 6 | yellow |
| 7 | brown |
| 8 | white |