Lantronix IntelliBox-I/O IntelliBox-I/O - User Guide - Page 174
Local Slave, Address, Number
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C: Modbus Local Slave The IntelliBox itself hosts a local Modbus slave role. This local slave is addressable from Modbus/TCP at Unit Identifier 255 (0xFF).The local slave provides access to the relay and digital I/Os as a single data block: Address Name I/O 0 XIO1 User configurable as input or output 1 XIO2 User configurable as input or output 2 Relay Output The server treats broadcast (Unit Identifier 0) as a request to forward to the Modbus serial port, but does not attempt to apply the function locally. The local slave supports the following Modbus functions: Number 1 2 3 4 5 6 15 16 23 43/14 Name Read Coils Read Discrete Inputs Read Holding Registers Read Input Registers Write Single Coil Write Single Register Write Multiple Coils Write Multiple Registers Read/Write Multiple Registers Read Device Identification (Basic) Note: Any attempt to write to an XIO that the user has configured as an input returns exception 4 (slave device failure). IntelliBox-I/O 2100 User Guide 174