Troubleshooting
6-72 Manual # 42-02-1P21
Addressing and CAN Bus Termination
Set SC-3HN addresses as shown in the job prints for the installation. Generic examples are pro-
vided below.
Riser Assignment
There may be up to four Main risers and four Auxiliary risers. Jumper locations JP3, JP2, and
JP1 are used to assign the appropriate riser to the SC-3HN board. In the following table, a “1”
indicates a jumper in place.
Floor Number and Front or Rear Opening
DIP switch SW1, switches 1 through 7 set the floor address for the board, beginning with Floor 1.
Switch 8 selects Front or Rear opening.
Baud Rate
Jumper JP4 is reserved for future use to select a different CAN Bus baud rate should it become
necessary. For now, the only option is to leave the JP4 jumper in place, setting baud rate to 125
kbps.
CAN Bus Termination
The CAN Bus must be terminated ONLY ON THE LAST SC-3HN connected to the wire drop
(farthest board from Dispatcher).
Table 6.23 Riser Assignment by Jumper Binary Representation
JP3 JP2 JP1 Riser
1 1 1 Main A (Binary value 7)
1 1 0 Main B (Binary value 6)
1 0 1 Main C (Binary value 5)
1 0 0 Main D (Binary value 4)
0 1 1 Auxiliary A (Binary value 3)
0 1 0 Auxiliary B (Binary value 2)
0 0 1 Auxiliary C (Binary value 1)
0 0 0 Auxiliary D (Binary value 0)
64
32
16
8
4
2
1
SW
8
7
6
5
4
3
2
1
ON
Floor address example = 11
ON switch adds its value to floor address.
OFF=FRONT, ON=REAR
When setting addresses, use the values silk
screened on the circuit board, not those shown
on the DIP switch.
JP5 OFF/Unterminated
All but last board
JP5 ON/Terminated
Last board on wire drop ONLY.
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