Motorola MOTOTRBO SYSTEM PLANNER Specifications download pdf (Page 47)

38 System Feature Overview

November, 2008

2.4.4.1 Physical Connection Information

The MOTOTRBO portable offers three GPIO pins, and the MOTOTRBO mobile offers five GPIO

pins for telemetry. These GPIO pins can be set to high or low, toggled, or pulsed for a configured

duration. A pin can be configured to be active high or active low. It is recommended to use an AC-

powered MOTOTRBO mobile for most extended telemetry applications. Motorola does not

currently offer external hardware for telemetry configuration.

The GPIO lines have a 4.7k ohm pull-up resistor tied to a regulated 5 V

supply within the mobile

radio. The regulated supply remains on as long as power is supplied to the mobile, even if the

mobile is turned off so the pull-ups are active even when the radio is off.

When configured as input, the voltages of the GPIO lines should be within the range of 0 V

5.5 V

•0 V

to 0.8 V

are interpreted as low level

•2.2 V

to 5.5 V

are interpreted as high level

When configured as output, the GPIO will be able to source a current of 1mA maximum at the

following levels:

•4.7 V

to 5.5 V

for a high level

•0 V

to 0.8 V

for a low level

2.4.4.2 Telemetry Examples

See section 3.2.1.1.2 and section 3.2.2.1.2 for diagrams and descriptions of the following simple

telemetry examples in both direct and repeater mode.

• Send Telemetry Command from Radio to Another Radio to Toggle an Output Pin

• Send Telemetry Message from Radio to Another Radio when Input Pin State Changes

• Send Telemetry Command to Toggle an Output Pin from Radio to Another Radio when Input

Pin State Changes

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Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 47