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Garmin GNC 420 Manual

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400 SERIES INSTALLATION MANUAL Page 4-19
P/N 190-00140-02 Page Rev L
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 Connector Pin I/O
NAV PAR DME - 8MHZ P4006 14 Out
SER DME – CHAN REQ/PAR DME - 4MHZ P4006 20 Out*
SER DME – RNAV MODE/PAR DME - 2MHZ P4006 21 Out*
NAV PAR DME - 1MHZ P4006 33 Out
NAV PAR DME - 800KHZ P4006 37 Out
NAV PAR DME - 400KHZ P4006 39 Out
NAV PAR DME - 200KHZ P4006 40 Out
NAV PAR DME - 100KHZ P4006 42 Out
NAV PAR DME - 50KHZ P4006 43 Out
NAV DME COMMON P4006 22 In
* 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
DC
.
4.10.2.2 King Serial DME Tuning
Pin Name Connector Pin I/O
NAV SER DME - DATA P4006 19 Out
NAV SER DME - CLOCK P4006 18 Out
SER DME – CHAN REQ/PAR DME - 4MHZ P4006 20 In*
SER DME – RNAV MODE/PAR DME – 2MHZ P4006 21 In*
NAV DME COMMON P4006 22 In
* 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
DC
.
NAV DME COMMON must be pulled low to indicate to the NAV module that it is the device channeling
the DME.
… 55 …


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