Garmin GTR 200, Installation Manual

Page: 41 / 85

190-01553-00 GTR 200 Installation Manual
Rev. B Page 3-17
3.6.5.4 Lighting Bus Interface Check
The display and bezel key backlighting on the GTR 200 can track an external lighting/dimmer bus input
and use it to vary the display and bezel key backlight levels accordingly. This check is only applicable if
Lighting Source (on the Lighting Setup Page,
Section 3.6.4.6 ) is set to 14V or 28V, and verifies that the
interface is connected correctly.
1. Refer to Section 3.6.4 to select the Lighting Setup Page.
2. Ensure the lighting bus input is set to its minimum setting.
3. Slowly vary the input lighting bus level. Verify that the display brightness tracks the lighting bus
setting. Continue to maximum brightness and verify proper operation.
3.6.5.5 Discrete Input Checkout
If one or both discrete inputs (Table 3-10) are connected, the wiring is checked using the following
procedure.
1. Refer to Section 3.6.4 to select the Discrete Setup Page ( Section 3.6.4.5) .
2. While the momentary contact pushbutton(s) are not being pressed (inputs are not grounded), verify
the DISC 1 and DISC 2 check boxes are not checked. If one or both boxes is checked, the wiring
is likely the cause of the failure.
3. Activate the DISC 1 and/or DISC 2 input by pressing the associated momentary contact
pushbutton (inputs are grounded). Verify the appropriate checkbox is checked. If the checkbox is
not checked the wiring is likely the cause of the failure.
Table 3-10 Discrete Inputs
Pin Pin Name Description
2 DISC 1 Configurable discrete active low input 1
22 DISC 2 Configurable discrete active low input 2