User manual

34 en | Installation NurseCall Main Unit
953.92 | v1.0 | 2007.07 User Manual TeleAlarm SA®
6.2.9 Setting the 100 Ohm termination jumper
Inside the NurseCall Main or Relay Units, the RS-485 interface can be configured with a jumper.
1. Disassemble the unit as described in Section 10.5.2 Unit Dismantling, page 68.
2. Remove the RS-232 board as described in Section RS-232 board removing, page 69.
3. Put the 100 Ohm termination jumper J112 (1).
Fig. 6.10 Setting the 100 Ohm termination jumper on the RS-232 board
4. Assemble the RS-232 board and the unit. This is basically the reverse of the dismantling
procedure.
1
i
NOTICE!
If you do not want to disassemble the NurseCall Main Unit, you also can short-out the pins 3
and 4 of the connector. This has the same effect as the jumper setting described above.
X See Section 13.7.4 RS-485 (unit rear), page 87 for connector wiring.