Figure 28 Control unit - Detector cable assembly
2.7.4 Modbus Cables
The Modbus connection between the Remote Display Unit and the first Control Unit should be made using
a suitable cable, refer to section 2.6. For each of the Modbus connections strip the cable to the required
length to connect to the terminals in the Control Unit, including the drain wires for the cable screens.
The wires should be terminated into the MODBUS IN terminals.
Subsequent Control Units should be connected using the MODBUS OUT terminals to the MODBUS IN
terminals. The end of line jumpers indicated in Figure 8 should be fitted only in the last Control Unit
connected.
When connecting between the Remote Display Unit and the Control Unit the 24v power supply cable
should be connected to the Remote Display Unit before connecting the Modbus cable.
A system wiring diagram is shown in Figure 29.
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