Figure 55 Control Unit Membrane
c. The Green LED above the button pressed will now be flashing. The Control Unit will
automatically store this new Modbus address.
d. When the address has been changed, the Control Unit returns to normal operation and indicates
the number of detectors connected.
Repeat the above for the number of Control Units installed per system.
After the addresses have been changed, please ensure that both EOL jumpers are fitted to the last
Control Unit only, all other Control Units need to have both the EOL jumpers removed.
Refer Figure 8 for EOL jumper positions.
NOTE: The Control Units 24Vdc Power Supply needs to be removed for a period of 10sec and
re-applied to ensure Modbus address changes are recognized on the Modbus network.
Once all Control Units have the correct Modbus addresses, the Remote Display Unit will need to be
programmed to detect the required number of engines on the system (refer Section 2.10.3)
2.10.2 Setting the Modbus address via the USB connection.
To change the Modbus address via the USB connection on the PCB (Refer Figure 56)
a. Connect the 24Vdc power supply to the Control Unit to be changed.
b. Connect the USB-B end to the USB socket located on the PCB inside the Control Unit (refer
Figure 56)
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