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User Guide: LDRA6 Appendix A: Modbus Communications
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A-4 MODBUS MIRRORING
A-4.1 To use the EIA-485 Modbus mirroring feature set the address on the master LDRA6 to address 255
and then set the address on the slave LDRA6 to 1. The Master unit will then repeat (mirror) any zone
alarms that come into the Slave Unit. When using this feature none of the local Alarm/Zone inputs will
work on the Master unit, The Master unit is only a repeater for the single slave unit being used.