Can Bus; Unit Id; Figure 4-2 Can Bus Termination For Gtr 200 - Garmin GTR 200 Installation Manual

4.4 CAN Bus

The CAN bus conforms to the BOSCH standard for Controller Area Network 2.0-B, and complies with
ISO 11898. Pins 25 and 26 are used to terminate the CAN bus. The CAN bus on J2001 is used for
communications between G3X system LRUs, and is the preferred connection method to G3X systems.
The GTR 200 should only be terminated if it is located at the end of the CAN bus. To terminate the CAN
bus at the GTR 200, short pins 25 and 26 together, this creates a 120 ohm termination internal to the
GTR 200 LRU. If installed, the jumper between pins 25 and 26 should be 3" or less, and contained
completely within the connector backshell.
GTR 20/200 GTR 20/200
CAN BUS HI CAN BUS HI
CAN BUS LO CAN BUS LO
CAN_TERM_A CAN_TERM_A
CAN_TERM_B CAN_TERM_B
CAN BUS LO
CAN BUS HI
CAN TERM B
CAN TERM A

4.5 Unit ID

The Unit ID pins are used for setting up the GTR 200 to be identified in the G3X system when connected
by the CAN bus as either a COM 1 or a COM 2 radio.
For installations with dual GTR 200 radios, leave pin 8 open to identify the GTR200 as COM 1. Connect
pin 8 to pin 27 on the second GTR 200 to identify it as COM 2. If installed, the jumper between pins 8 and
27 should be 3" or less, and contained completely within the connector backshell.
For single installations do not connect pin 8 to pin 27 (leave open) to identify the GTR 200 as COM 1.
Refer to drawings in Appendix D
ID IN
ID LO
190-01553-00
Rev. G
J2001 J2001 P2001 P2001
7 7
6 6
25 25
NOTE: JUMPER (BETWEEN PINS 25 & 26) REQUIRED NOTE: JUMPER (BETWEEN PINS 25 & 26) REQUIRED
26 26 WHEN GTR 20/200 IS LOCATED AT END OF CAN BUS WHEN GTR 20/200 IS LOCATED AT END OF CAN BUS

Figure 4-2 CAN Bus Termination for GTR 200

Pin Name
for ID connections.
Pin Name
Pin I/O
6 I/O
7 I/O
25
26
Pin I/O
8
27
GTR 200 Installation Manual
Page 4-3
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