Dme Tuning (Gns 430 Only) - Garmin GNC 420A Installation Manual

4.10

DME TUNING (GNS 430 ONLY)

4.10.1 DME Tuning Function
The GNS 430 can channel a DME based on the tuned VLOC frequency. The GNS 430 outputs 2 of 5,
BCD or Slip parallel DME and King Serial DME channeling format. When DME COMMON is held low,
the GNS 430 actively tunes the DME.
4.10.2 DME Tuning Electrical Characteristics
4.10.2.1 Parallel DME Tuning
Pin Name
NAV PAR DME - 8MHZ
SER DME – CHAN REQ/PAR DME - 4MHZ
SER DME – RNAV MODE/PAR DME - 2MHZ
NAV PAR DME - 1MHZ
NAV PAR DME - 800KHZ
NAV PAR DME - 400KHZ
NAV PAR DME - 200KHZ
NAV PAR DME - 100KHZ
NAV PAR DME - 50KHZ
NAV DME COMMON
* These pins are outputs when the GNS 430 is configured for 2 of 5 parallel DME tuning.
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 µA.
NAV DME COMMON must be pulled low to indicate to the NAV module that it is the device channeling
the DME.
NAV DME COMMON is considered active if either the voltage to ground is < 1.9 V or the resistance to
ground is< 375 Ω. These inputs are considered inactive if the voltage to ground is 11-33 V
4.10.2.2 King Serial DME Tuning
Pin Name
NAV SER DME - DATA
NAV SER DME - CLOCK
SER DME – CHAN REQ/PAR DME - 4MHZ
SER DME – RNAV MODE/PAR DME – 2MHZ
NAV DME COMMON
* These pins are inputs when the GNS 430 is configured for King Serial DME tuning
When NAV SER DME – DATA or NAV SER DME – CLOCK is asserted high and driving a 360 Ω load,
the driver output voltage is not less than 8 V, and when asserted low shall not be greater than 10 mV.
SER DME – CHAN REQ/PAR DME – 4MHZ, SER DME – RNAV MODE/PAR DME – 2MHz, and
NAV DME COMMON are considered active if either the voltage to ground is < 1.9 V or the resistance to
ground
is< 375 Ω. These inputs are considered inactive if the voltage to ground is 11-33 V
NAV DME COMMON must be pulled low to indicate to the NAV module that it is the device channeling
the DME.
400 SERIES INSTALLATION MANUAL
P/N 190-00140-02
Connector Pin
P4006 14
P4006 20
P4006 21
P4006 33
P4006 37
P4006 39
P4006 40
P4006 42
P4006 43
P4006 22
Connector Pin
P4006 19
P4006 18
P4006 20
P4006 21
P4006 22
DC
I/O
Out
Out*
Out*
Out
Out
Out
Out
Out
Out
In
.
DC
I/O
Out
Out
In*
In*
In
.
Page 4-19
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