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Modbus Registers

Below is a list of available MODBUS registers. The same register numbers are also used by the MIOS-2 protocol.

Modbus Read / Write (0x17) Function

METEL IO modules have implemented the MODBUS function (0x17) Read/Write of Multiple registers. Typically it is required to have two separate requests (and responses) for:

1. Writing of outputs via MODBUS function (0x16) Writing Multiple Registers

2. Reading of inputs via MODBUS function (0x03) Read Holding Registers

This requires a total of 4 frames to be sent over MODBUS. If using 0x17 function only one request is needed for the reading and writing of outputs. This requires a total of 2 frames to be sent over MODBUS.

Default Settings of Communication

Device ID: 1
Baudrate: 115 200
Parity: None
Data bits: 8
Stop bits: 1

Note: The MODBUS address is the same as the address of the main device of which the IF module is part.

Subject Channel Type R/W Value Offset
States of
Balanced Input 1 (bin) DI#33 bit R 0 = inactive
1 = active
Balanced Input 2 (bin) DI#34 bit R 3034
Balanced Input 3 (bin) DI#35 u16 R 3035
Balanced Input 4 (bin) DI#36 u16 R 3036
Balanced Input 1 AI#33 u16 R 1000 = 1000Ω
0 = 0Ω
Balanced Input 2 AI#34 u16 R 5034
Balanced Input 3 AI#35 u16 R 5035
Balanced Input 4 AI#36 u16 R 5036
Inputs DI#33 - DI#48 u16 R 0x0000 - 0x000F