User’s Manual of IMG-110T
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4.5.2 Slave ID
The Modbus protocol provides a unique ID number (1 ~ 247) to all of the slave devices. The ID number is used to identify the
address of the slave device to respond to requests from the master device. The Modbus equipment ID number is set by the
manufacturers. Most of them can be modified. It is an actual ID number.
Virtual ID is used to specify the ID Modbus of each connected gateway. When the Modbus master device accesses the virtual
ID, the gateway device converts the virtual ID address into the actual ID address. When the Modbus slave device responds to
the master device, the gateway device will convert the actual ID address to the virtual ID address. For the Modbus master, it
only needs to access the "virtual" ID. The conversion between the virtual ID and the actual ID is called ID mapping. The
Gateway device achieves the function of ID mapping by setting the ID range and ID offset. Only the channel type in the slave
mode of the channel can be set up, including the Slave ASCII, Slave RTU and Slave TCP. Virtual ID + ID Offset = Real ID
(Actual ID).
This function allows setting the value for slave ID configuration. Press the “Add” and “Submit” buttons to set the value and
the screen in Figure 4-7 appears.
Figure 4-7: Slave ID Screen
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