System Feature Overview 59
68007024085 April 2011
Data Revert Channels are exclusively used by the system for transporting data packets. They are
not used for voice communication. As Data Revert Channels offload most of the data
communication from the Trunked Channels, they facilitate more voice communication over these
channels. Data Revert Channels are especially useful for transporting location responses.
Each channel programmed into a radio has a configurable CPS option to designate the GPS
transmission channel on which the radio transmits Location Update messages. The CPS options
for the GPS transmission channel are Trunked, Revert, and None. Choosing Trunked means that
the data messages to the Server are transmitted on the Rest Channel. In the case of Revert, data
messages to the Server are transmitted over one of the revert channels that are programmed into
the subscriber. There may be instances when the radio is known to be out of range of any control
station accepting location updates. In order to extend battery life, minimize time away from the
Rest Channel, and/or to efficiently use frequency resources in these situations, the radio can also
be configured to disable the transmission of data messages on revert channels by using the
selection None.
To configure a radio to support data messages, there are a few parameters that must be managed
correctly. How these parameters interact to dictate the radio’s performance is shown in the table in
section Section 2.4.3.4 “GPS Revert Channel”.
2.4.4 Telemetry Services
The MOTOTRBO radios incorporate telemetry functionality that is only supported in the digital
mode of operation. Both the MOTOTRBO portable and mobile radio support General Purpose
Input/Output (GPIO) lines on the radio accessory connector.
With this telemetry functionality, the originating radio can send a telemetry command to another
radio. Sending the telemetry command can be triggered either by GPIO pins or a programmable
button. In either case, the telemetry command can be sent out on the “normal traffic” channel (e.g.
the selected channel for single site conventional systems). Alternatively, if the telemetry command
is triggered by a programmable button, the telemetry command can be sent out on a CPS
configured telemetry channel that is selected from the “Channel Pool” or visible zone channels.
Telemetry commands instruct GPIO pins on the target radio to be set, clear, toggle or pulse. The
telemetry commands can also be used to query the status of GPIO pins at the target radio.
At the receiving end, the basic built-in telemetry functionality allows the target radio to translate the
received telemetry command and to trigger GPIO action. It also enables the target radio to display
a programmed Text Status Message or act on a telemetry command received from the originating
radio responding to an event at the originating radio's GPIO pins. The Telemetry Text Status
Message is provisioned in the source telemetry radio and is displayed as a popup alert at a target
radio via the telemetry application. Since the Telemetry Text Status Message is not sent as a
standard text message, it is not saved in the Inbox or indexed. Furthermore, its target can only be
another radio since it must be received and processed by the telemetry application within the
radio.
It is possible for the message to be forwarded to an external computer connected to the radio, or
the option board, where a customer supplied application could monitor and take an action.
MOTOTRBO provides a telemetry interface for third-party telemetry applications. Further
information is available in the Telemetry Services ADK listed under “MOTOTRBO Applications
Interfaces” on page 129.
Telemetry over-the-air signaling utilizes the data service similar to the way that text messaging
works. It can co-exist with voice and text messaging. If telemetry messages are expected to occur
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