Mototrbo and AlphaCom interfacing

This article describes how the AlphaCom can be integrated to the digital radio system Mototrbo from Motorola.

Functionality:

• Without the XCMP converter only basic groupcall is supported (no

calling ID)

• With the XCMP converter and EventHandler configuration the following

functionality has been tested:

• Groupcall in fixed group (M-key is PTT)
• Semi-duplex private call to selectable MOTOTRBO radio
• Incoming group and private call to predefined intercom station
• Predefined text messages to MOTOTRBO radio
• Call Alert to MOTOTRBO radio
• Display of Calling ID
• The following functionality has not been tested yet:
• Incoming Emergency Call
• Talkgroup change
• Remote monitor (listen in at radio)

The following functionality is currently not supported:

• Receiving of text messages from AlphaCom (radio firmware issue). Which means that the radio handsets cannot receive for instance Call Request

Most suitable radio is DM3600 (display model); for basic functionality also DM3400 can be used. Connections:

• The Mototrbo radio is connected to IP-ARIO with:
• RX audio to Radio IN (Motorola 770 mV nom.)
• TX audio to Radio OUT (Motorola 80 mV nom.)
• PTT to RCO output (active low)
• When more than groupcall functionality is required than a specific USB to Serial adapter is necessary (XCMP converter); the adapter is connected to serial port on the IP-ARIO and to the accessory port on MOTOTRBO radio (USB).

• Audio is asymmetric, DC-block capacitor is required in TX audio line to radio.
• Ignition input of the radio needs to be connected to +12V to power-up the radio automatically.