Modbus is supported in both Master and Slave modes.
Use the Slave mode to communicate with MOXA/EDAM type units, reading the discrete input registers.
The Master mode allows the SMC Gateway to become a device that can be interrogated by other systems. Example uses could be letting a BMS system know that a fire alarm has activated, or that the DMR radio system has an issue.
Slave devices such as the MOXA ioLogix range are configured using a simple form, where text descriptions can be added to each input: