GE 1200 Series Interconnection And Wiring Manual page 24

1200-2000 Series Fire Panels, Repeaters, and Emulators
24
Interconnection and Wiring Guide
Figure 21: LON port PCB connections
1. LON2000
2. Service switch
3. LON device
4. LON device
5. Data + (D+)
6. Data - (D-)
7. Termination
Jumper in terminated (T) position: serial communication port is terminated into 120Ω
Jumper removed: serial communication port is not terminated.
If a LON2000 interface board is used in the first or last panel of a LON network, the jumper has to be
set to (T) (terminated).