Template:Networking rutos manual modbus modbus tcp get parameters table

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Get Parameters


Modbus parameters are held within registers. Each register contains 2 bytes of information. For simplification, the number of registers for storing numbers is 2 (4 bytes), while the number of registers for storing text information is 16 (32 bytes). The register numbers and corresponding system values are described in the table below:

required value register address register number number of registers representation
System uptime 1 2 2 32 bit unsigned integer
System hostname 7 8 16 Text
Router serial number 39 40 16 Text
LAN MAC address 55 56 16 Text
Router name 71 72 16 Text
Current WAN IP address 139 140 2 32 bit unsigned integer
Digital non-isolated input (4 PIN connector) 324 325 1 32 bit unsigned integer
Digital open collector output (4 PIN connector) 325 326 1 32 bit unsigned integer
PIN 3 direction 326 327 1 16 bit unsigned integer
PIN 4 direction 327 328 1 16 bit unsigned integer