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Since its not documented anywhere I will provide P1235/P1525 wiring info 1639-K401 pinout

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libram11

Vendor
Oct 7, 2010
50
US
I've had to document all of this to correct a customer site so here it is for everyone.

Serial port 3/4 RJ12 6 pin (tab down facing away left to right, this is how rj's are numbered)
Pinout
1 Pwr/RTS
2 GND
3 TX
4 RX
5 GND
6 CTS

1639-K401 RJ12 to rj45 adapter (personally I'd throw this away and make a new cord)
RJ12 pin RJ45 pin
1 No Connect
2 No Connect
3 3
4 2
5 5
6 8

Pin connections needed when fully wired inside a db25 (NOT using the 1639-K401)
RJ12 pin RJ45 Pin Db25 pin
1 2 5
2 3 7 (spliced inside connector)
3 4 3
4 5 2
5 6 7 (spliced inside connector)
6 7 4

If using the 1639-K401
RJ45 pin db25 pin
3 3
4 2
5 7
6 4
 
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