Maxtrac/GM300/R1225/M1225/M100/M120 RJ45 Programming Adaptor

This pinout will require you to have a RJ45 to DB25 female adapter as pictured below:

rj45_db25.jpg

You can find these on ebay by searching for DB25 RJ45.

Please note:

This will also require a short (1 inch) piece of 24 gauge wire to go between pin 4 & 11 on the DB25F

RJ45 ColorDB25F PinSignal
Green1Ground
Orange15BUS

You simply plug in whatever length of ethernet patch cable into this adapter and the other end into the radios mic jack.