SRM9000 can control simoco srm9000 radio's using the serial interface. You need a programming cable, or make one! You can use an FTDI TTL232R USB to TTL cable wired to an RJ45 plug which fits to the microphone connector on the front of the radio. The tx data and rx data are 5v TTL so you require some form of level shifting. A MAX232 circuit would equally do using 3 wires from pin 1,2 and 7 (ground).
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