Sanden SN3500, Installation Manual

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Installation
82005-IM-K Sandel SN3500 Installation Manual Page 3-11
Can also be used to operate a switching relay, or external annunciator
whenever a TACAN is selected by the NAV pushbutton. The TACAN
receiver(s) are configured on the NAV maintenance pages.
P3-4: GPS1 Relay Sense / GPS SELECTED Input
This input is used when the SN3500 is set up for slave mode so an external
GPS switch can be used to switch to an external GPS receiver. Causes
proper mode switching and annunciation on the SN3500 display. This input is
active only when enabled in the OBS / RELAY / CDI maintenance page 10.
P3-5: NAV2 Relay Sense
Feedback from NAV2 relay, if used. When replacing a SN3308 with the
SN3500, see configuration page 7-14.
P3-6: Analog DME Valid or REV Control
Discrete input for Analog DME valid or Reversionary Display On/OFF control.
For Reversionary Attitude Display units the Reversionary Display is enabled
by a closure to ground through an external toggle switch or maintained
pushbutton switch.
P3-7: GPS1 Switching Relay Discrete Output
Can be used to operate a switching relay whenever GPS1 (or Loran1) is
selected by the NAV pushbutton. The receiver type is selected on the LNAV1
maintenance page.
P3-8: VHF NAV2 Switching Relay Discrete Output
Can be used to operate a switching relay whenever VHF NAV2 is selected by
the NAV pushbutton. VHF NAV2 is enabled on the NAV2 maintenance page.
P3-10: GPS APPR ARM Discrete Output or TACAN Relay Out
Open Drain active-low output used to select APPR ARM mode of the external
GPS receiver. Accessible during normal use from the pilots NAV menu
operation.
Can also be used to operate a switching relay, or external annunciator
whenever a TACAN is selected by the NAV pushbutton. The TACAN
receiver(s) are configured on the NAV maintenance pages.
P3-12: GPS2 Relay Sense
Feedback from GPS2 relay, if used.
P3-13: NVIS Ctrl or REV Control
For NVIS capable units NVIS mode is enabled by a closure to ground through
an external toggle switch or maintained pushbutton switch. NVIS mode is
annunciated onscreen so an external annunciator is not required.