190-01879-11 GMA 245/245R Installation ManualRev. 6 Page 4-54.4.1 CAN Bus TerminatorThe following procedures are applicable only if the GMA 245 is at the end of the CAN bus, a 120 Ωtermination will be required to be added between the CAN HI and CAN LO pins at the unit. Thistermination can be accomplished in 2 different ways.Method 1Using a 1/4 Watt 120 Ω 5% wirewound resistor, splice in the resistor at the unit pins connecting one side ofthe resistor to HI and the other to the LO. Heat shrink over the leads of the resistor to prevent shorting tothe backshell.Method 2Use the optional accessory GPN 011-03002-00 (Connector Kit, 9 Pin, w/CAN Term). Referencing theJ2401 wiring diagrams in this manual, install 011-03002-00 no more than 0.3 meters from the GMA. Pins1 and 2 are the resistor connection for the 9 pin D-sub terminator in this kit. This kit allows easy removal ofthe termination for allowing CAN Bus changes in the aircraft installation.4.5 Lighting BusThe GMA 245 can be configured to track a 14 or 28 Vdc lighting bus using these inputs. Refer toAppendix C for lighting interconnections.Backlighting refers only to the lighting of the text labels on the front panel and is controlled by the inputsin Table 4-5. The brightness of the LED annunciators that illuminate each key when selected is controlledby a photocell that operates independently of the backlight input.NOTEBacklighting of button and panel text is controlled by the aircraft lighting bus inputs if thelighting bus is connected. If the lighting bus is not connected, all backlighting is controlledby the photocell.Table 4-5 Lighting BusPin Connector Pin Name I/O5 J2402 LIGHTING BUS 14V LO/28V LO --6 J2402 LIGHTING BUS 14V HI/28V LO IN7 J2402 LIGHTING BUS 14V HI/28V HI IN
