
122 System Components and Topologies
November, 2008
3.2.2.1.2 Telemetry Commands in Repeater Mode
Below are some basic telemetry configurations using both time slots of a repeater. A description of
each follows.
In the first basic configuration a portable radio is programmed with a button (shown by the pointing
finger above) that sends a preconfigured telemetry command over the air on the second time slot
to toggle a mobile radio’s output GPIO pin. The GPIO pin is connected to external hardware that
detects the closure and turns on a light (shown by a light bulb above). This configuration can be
extended to such things as remotely opening door locks, turning on pumps, or switching on
sprinklers. Another application might be to combine the voice from the radio’s external audio lines,
a relay closure, and a public announcement system to remotely make announcements over the
intercom from your portable radio.
This second basic configuration is a mobile configured on the second time slot, connected to
customer supplied external telemetry hardware (shown by the door icon in lower right corner),
detects a closure that signifies a door has been opened. Upon detecting the GPIO pin as active, it
sends a pre-configured Text Status Message to a particular portable radio. The portable radio
displays “Door Opened” to the user as a popup alert. This basic configuration can be used at
remote locations to detect a variety of sensors such as water levels, door and window intrusions,
or even motion sensors. Combining the first and second configuration, the user can create
complex control systems that initiates a large door to close, and then announces when the door
physically closes.
Figure 3-21 MOTOTRBO Radios in Digital Two-Slot Digital Repeater Mode with Telemetry Functions
f
1
s
1
f
2
s
1
MOTOTRBO
Digital Repeater
RX = f
1
TX = f
2
d
i
g
i
t
a
l
MOTOTRBO SU
(digital mode)
MOTOTRBO SU
(digital mode)
Slot 1
Slot 2
RX = f
2
TX = f
1
Slot = 1
RX = f
2
TX = f
1
Slot = 1
f
1
s
1
f
2
s
1
d
i
g
i
t
a
l
f
1
s
2
f
2
s
2
d
i
g
i
t
a
l
MOTOTRBO SU
(digital mode)
RX = f
2
TX = f
1
Slot = 2
MOTOTRBO SU
(digital mode)
RX = f
2
TX = f
1
Slot = 2
f
1
s
2
f
2
s
2
d
i
g
i
t
a
l
(Input)
Telemetry Device
(Customer Provided)
Telemetry Device
(Customer Provided)
GPIO
(Input)
Telemetry Device
(Customer Provided)
“Door Open”
Telemetry Device
(Customer Provided)
(Output)
GPIO
(Output)
GPIO
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