I've been stalled for a few hours trying to find a good source for RS-232 pinout and conversion. I am using the tips pictured above for Rs-232 lines between the controllers and the equipment. Uses a cat-5, which allows termination to length.
To build an 8-wire RS232/RS485 serial cable for use with the Nema-4 enclosure, use a standard CAT-5 networking cable to act as the extension between the computer and the radio modem. (This cable will be carrying RS232 signals, not ethernet signals.)
Assemble both the yellow and green adapter according to this table:
DB9 pin RS-232
Signal Name RS-485
Signal Name Wire color
(Adapter) RJ45 pin # Wire color
1 DCD Orange 2 Orange
2 RXD TX- Red 4 Blue
3 TXD RX- Yellow 6 Green
4 DTR Blue 1 White/Orange
5 GND GND White 8 Brown
6 DSR - - -
7 RTS RX+ Black 3 White/Green
8 CTS TX+ Green 5 White/Blue
9 PWR(RI) PWR* Brown 7 White/Brown
When the adapters are assembled, test the cable by attaching the loopback plug into the yellow adapter and the CAT-5 cable, and the green one into the PC and the CAT-5 cable.
Use the loopback test in the X-CTU software to determine that packets can be transmitted correctly.
Remove the loopback adapter and attach the radio modem.
This is a great link!http://www.digi.com/support/kbase/kb...tdetl.jsp?kb=3