Connect the programming cable to the DB9 serial port (or USB adapter) on your computer.
First, let's clarify a common misconception. You cannot program a GM950 with generic "CHIRP" software or open-source tools. The GM950 uses a closed firmware architecture that relies exclusively on Motorola’s official . Motorola Gm950 Programming Software
Modern computers do not have DB-9 serial ports (RS-232). You have two options: Connect the programming cable to the DB9 serial
Obtain CPS:
Many guides mention a "RIB" (Motorola part # RLN4008). The GM950 is one of the few radios that does not strictly need a RIB for most functions if you have a correctly wired "RIB-less" cable. A RIB-less cable has a transistor or level shifter inside the DB-9 connector. However, for absolute stability (especially for tuning), using a genuine RIB adds a layer of protection against static and voltage spikes. The GM950 uses a closed firmware architecture that
: Configure Private Line (CTCSS) and Digital Private Line (DCS) to ensure communication privacy by filtering out unwanted transmissions. Channel Customization Power Levels