To change a 9 pin to 25 pin connector use the following.
It is a direct conversion which does not account for
null modems. Note that pins 2 and 3 are reversed on the
9 pin and 25 pin, but this is not a null modem cable!
DB-9---DB-25---function
-
1--------8--------DCD
2--------3--------RXD
3--------2--------TXD
4--------20-------DTR
5--------7--------gnd
6--------6--------DSR
7--------4--------RTS
8--------5--------CTS
9--------22-------Ring
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