Mototrbo and AlphaCom interfacing

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AlphaCom and MOTOTRBO integration

This article describes how the AlphaCom can be integrated to the digital radio system Mototrbo from Motorola. Most suitable radio model is DM3600 (display model), but for basic functionality also DM3400 can be used. The interface between AlphaCom and the radio is either the IP-ARIO unit or the FBSAR board.

Functionality

What functionality depends on whether the AlphaCom and the radio communicate via serial data or not. If more than groupcall functionality is required, then a specific USB to Serial adapter from Motorola is necessary, a XCMP converter. The adapter is connected to the serial port on the IP-ARIO and to the accessory port on MOTOTRBO radio (USB).

The MOTOTRBO™ Extended Control and Management Protocol (XCMP) allows the AlphaCom to control and manage MOTOTRBO™ radios.

Without XCMP converter

Without the XCMP converter only basic groupcall is supported (no caller ID)

With XCMP converter

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 Caller ID

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

The following functionality has not been tested yet:

Incoming Emergency Call
Talkgroup change
Remote monitor (listen in at radio)

Connections

Connections between the MOTOTRBO radio and IP-ARIO:

RX audio to Radio IN (Motorola 770 mV nom.)
TX audio to Radio OUT (Motorola 80 mV nom.)
PTT to RCO output (active low)
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.
Optional: XCMP converter. The adapter is connected to the serial port on the IP-ARIO and to the accessory port on MOTOTRBO radio (USB).

Configuration

Outgoing call to radio:

In Users & Stations, set the radio interface (IPARIO or FBSAR) to Station Type = PNCI.

Event:

Event Owner: Stations w/UDP 8 (all stations)
Event type: 25 - Event trigger with parameter
Subevent: 255
When Change To: ON
When Related To: The IPARIO interface
Action:
WUDD 501 %op(%udd(501),+,1)
WUDD 502 %sev
WUDD 503 %op(%op(%udd(503),*,10),+,%udd(502))
IF %op(%udd(501),=,4)
$DSPL L%1.dir U19 031354 'Call: %udd(503) M=PTT'
EDO 1 "AT+CCR=1,4,1,%udd(503)\r"
LOG "=> AT+CCR=1,4,1,%udd(503)"
WUDD 504 1
ENDIF