Garmin GTR 225 Installation Manual page 53

5.2.10.2.2 King Serial DME Tuning
When SERIAL DME – DATA or SERIAL DME – CLOCK is asserted high and driving a 360  load, the
driver output voltage is not less than 8 V, and when asserted low is not greater than 10 mV.
SERIAL DME – RNAV/CH REQ, SER DME – RNAV MODE, and DME COMMON are considered
active if either the voltage to ground is less than 1.9 V or the resistance to ground is less than 375 . These
inputs are considered inactive if the voltage to ground is 11-33 VDC.
DME COMMON must be pulled low to indicate to the GTR/GNC that it is the device channeling the
DME.
Pins 18, 19, 20, and 41 are configured for King Serial DME tuning.
SERIAL DME - DATA
SERIAL DME - CLOCK
SERIAL DME - RNAV/CH REQ
SERIAL DME - RNAV MODE
DME COMMON
SERIAL DME - DME REQUEST
190-01182-02
Rev. B
Pin Name Connector
P2002
P2002
P2002
P2002
P2002
P2002
GTR 225/GNC 255 TSO Installation Manual
Pin I/O
19 I/O
18 I/O
20 In
21 In
41 In
44 I/O
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