User Manual

5. ELECTRICAL DESCRIPTION
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LZ T 123 7605 P1C
Extended I/O Signals
Digital Inputs
The digital input IN-1 is available on pin 3 of the RJ12 connector. Its state
is detected by IO5 of the embedded Radio Device engine, see Control
Terminal-Radio Device signal cross reference table, page 30.
The distinction between low level and high level signals is at the voltage
level of 3 V. Voltages above 3 V are detected as high level voltages and
voltages below 2.8 V are detected as low level.
Digital Outputs
The RJ12 power supply connector has two different output drivers:
• OUT-1 is driven by a high side switch that applies V
IN
to pin 5 of the
RJ12 connector. IO1 of the embedded radio device is used to activate
the OUT-1 signal, see Control Terminal - radio device signal cross
reference table, page 30.
• OUT-2 is driven by a low side switch that shorts pin 2 of the RJ12
connector to ground when activated. IO3 of the embedded Radio
Device engine is used to activate OUT-2, see Control Terminal - Radio
Device signal cross reference table, page 30.
V
IN
Monitoring
The voltage, V
IN
, can be monitored internally by the Control Terminal, for
example if the Control Terminal is supplied from an external battery.
ADC1 on the Radio Device is used for this purpose, see Control Terminal-
Radio Device signal cross reference table, and is calibrated to operate in the
voltage range 0 – 31.875 V. The resolution of the 8 bit converter, ADC1,
provides a measurement accuracy of approximately 3%.
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