User guide

Modbus RTU Slave Configuration
Click the Modbus RTU Slave button to access the configuration page.
1) Serial Port: Select which serial port is being used for communication. This port must be
configured on the Port Configuration page. If it has not yet been configured, it will display
Disabled after the Port descriptions in this dropdown.
2) Enter a Device Label to identify the device within the gateway.
3) Slave Address: This Slave Address must be unique for all Modbus RTU Slave devices on the
RS485 network.
4) Inactivity Timeout: Amount of time the gateway will wait for a Read/Write request before
issuing a timeout.
5) To enable data swapping, select the required Swap Indicator. If the bytes appear in the wrong
order, enable swapping to change the data. This swapping does NOT change Coils and their
ordering inside the Bit Pack.
6) Bit Pack: Select the formatting of the Coil Status/Input Status. Automap will use this packing size
to map coils to/from the other protocol. The bit pack selection here should match that of the
other protocol. The starting address is considered Bit 0 and is the low-order bit.
7) Enable Modbus ASCII: Enable ONLY if you want to communicate using Modbus ASCII. The
Master must support Modbus ASCII.
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