The Motorola CM140 operates in the 136–174 MHz (VHF) or 403–470 MHz (UHF) bands. Unlike modern trunking radios, the CM140 is a conventional analog FM radio. Its programming software is not a simple GUI but a low-level tool that writes directly to the radio’s EEPROM (typically an Xicor X24C16 or similar). The CPS communicates via a serial protocol at 9600 bps, 8 data bits, no parity, 1 stop bit.

: View the radio's serial number and firmware version, or update/recover firmware to regain access to password-protected devices.

RJ45 to USB or DB9 Serial cable (plugs into the microphone socket). Rear Port:

Plug in your programming cable. Open Device Manager (Right-click Start > Device Manager). Look for "Ports (COM & LPT)". Your cable should appear as "USB Serial Port (COMx)". Note the COM port number.