Dme Tuning (Gtn 650 Only) - Garmin GTN 635 Installation Manual

5.2.18 DME Tuning (GTN 650 Only)

5.2.18.1 DME Tuning Function
The GTN 650 can channel a DME based on the tuned VLOC frequency. The GTN 650 outputs 2 of 5,
BCD, or Slip parallel DME and King Serial DME channeling format. When DME COMMON is held
low, the GTN 650 actively tunes the DME.
5.2.18.2 DME Tuning Electrical Characteristics
5.2.18.2.1 Parallel DME Tuning
PAR DME 100KHZ-A/NAV SERIAL DME HOLD
PAR DME 100KHZ-B
PAR DME 100KHZ-C
PAR DME 100KHZ-D
PAR DME 100KHZ-E
PAR DME 50KHZ
PAR DME 1MHZ-A
PAR DME 1MHZ-B
PAR DME 1MHZ-C
PAR DME 1MHZ-D/NAV SERIAL DME ON
PAR DME 1 MHZ-E
DME COMMON
For each of the parallel DME tuning discrete outputs, the driver output voltage is not more than 1.0 V
while sinking 20 mA. The maximum off state leakage current with respect to ground is less than 10 A.
DME COMMON must be pulled low to indicate to the GTN 650 that it is the device channeling the DME.
DME COMMON is considered active if either the voltage to ground is <1.9 V or the resistance to ground
is <375 . These inputs are considered inactive if the voltage to ground is 11-33 VDC.
Pins 37, 40, 41, 42, 43, 45, 47, 33, 54, and 56 are configured for 2 of 5 parallel DME tuning.
5.2.18.2.2 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
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 <1.9 V or the resistance to ground is <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 GTN 650 that it is the device channeling the
DME.
Pins 18, 19, 20, and 41 are configured for King Serial DME tuning.
Page 5-24
Rev. C
Pin Name
Pin Name
Connector Pin
P1004 37
P1004 39
P1004 40
P1004 42
P1004 54
P1004 43
P1004 45
P1004 46
P1004 47
P1004 33
P1004 56
P1004 41
Connector Pin
P1004 19
P1004 18
P1004 20
P1004 21
P1004 41
P1004 44
GTN 625/635/650 TSO Installation Manual
I/O
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
In
I/O
Out
Out
In
In
In
I/O
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