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MODBUS SLAVE
The correct settings of the connected Modbus devices are described in the application note titled
"MODBUS configuration", where the entire settings are described, including automatic actions.
Automatic action with a Modbus Slave on the input side means that there is another modbus master
device that writes to the switch registers and thus controls the switch outputs that are available in event
management.
COIL = 1 bit register, HOLDING = 16 bit and 32 bit registers
Close
- the event starts with writing logical 1 to the COIL register
Open
- the event starts with writing logical 0 to the COIL register
Direct
– the event is sent every 3 seconds when a registry entry changes, the change is sent immediately
Change
- the event starts with each registry entry change
Example:
The Modbus Master device writes to COIL register No. 3 on the switch and thus turns on/off
port No. 1 on the switch.
MODBUS MASTER
The correct settings of the connected Modbus devices are described in the application note titled
"MODBUS configuration", where the entire settings are described, including automatic actions. In
automatic action with Modbus Master on the side, the switch is in the role of Modbus Master device,
which reads registers from other Modbus Slave devices and thus controls events on the output side.
Value Change
- changes the value of the read register
Slot Active
- active slot, correct reading of the register
True
– the event is active if logical 1 is in the read register
False
- event is active if logical 0 is in the read register
Change
- the event is triggered with each change in the value of the read register
Example:
The switch reads the register from slot 8 and, if logical 1 is read from the register, turns the
camera 1 to position 11.
Event Management – MODBUS SLAVE/MASTER
Application notes:
MODBUS configuration (18 pages)
