Motorola GM950 Programming Software Review
Install CPS:
The Motorola GM950 is a 25W/45W mobile transceiver covering VHF (136–174 MHz) and UHF (403–470 MHz) bands. Unlike modern radios using USB-based CPS (Customer Programming Software), the GM950 requires a legacy RLN4008B RIB (Radio Interface Box) and a DB9-to-RJ45 cable connected to a physical COM port running MS-DOS or Windows 95/98. The official GM950 CPS (v1.12) suffers from: Motorola Gm950 Programming Software
| Error Message | Likely Cause | Solution |
| :--- | :--- | :--- |
| "Communication Timeout" | Wrong COM port, cable not connected, radio off | Check serial port assignments in DOS. Use MODE COM1 4800,N,8,1 |
| "Checksum Mismatch" | Codeplug corruption or wrong software version | Find the exact RSS version for your radio’s firmware. |
| "Model Number Mismatch" | You are using GM950 Plus software on a standard GM950 | Re-download correct RSS. Never force-write. |
| "Radio Not Responding" | USB adapter lag or bad cable | Use a true COM port. Replace the cable. |
| "DOSBox: Serial error" | Virtual machine not passing hardware interrupts | Config: serial1=directserial realport:COM1 in dosbox.conf | Configure MDC1200, DTMF, or other signaling parameters
The Motorola GM950 Programming Software is compatible with Windows-based operating systems, including Windows 10, 8, and 7. However, it may not be compatible with macOS or Linux systems, which may limit its use for some users. | Error Message | Likely Cause | Solution
The software will display a progress bar. Once complete, save this original file as a backup (e.g., GM950_backup.cps). Step 3: Modifying the Codeplug
Port Configuration: In Windows Device Manager, ensure your USB-to-Serial adapter is set to COM1. In your DOSBox configuration file, set the serial port to match (e.g., serial1=directserial realport:COM1). 3. Programming Steps MOTOTRBO CPS Download & Setup Guide | Motorola CPS Software