Parameter Description
VariableType
You can choose the following variable types of the Modbus data to be read:
1: char : 8 bits,
2: unsigned char : 8 bits,
3: short : 16 bits,
4: unsigned short : 16 bits,
5: long : 32 bits,
6: unsigned long : 32 bits,
7: float : 32 bits,
8: double : 64 bits,
9: ascii-text : 8 bits / char
Real Type
Real type - determines, if the registers of real values have to be processed in reversed
order.
0: Normal order,
1: Reversed order,
2: Byte swap order,
3: Word swap order,
Real types 2 and 3 are available from V03.04.02.01.
Integer Byte
Order
It determines in which byte order format the read value will be processed (default: 0)
0: Normal order (big-endian)
1: Reversed order (little-endian byte swap)
2: Byte swap order (big-endian byte swap)
3: Word swap order (little-endian)
Note: Integer byte order is available for 16 bits and 32 bits variable types only, and it is
supported for the version starting from MindConnect IoT2040 V03.04.02.13.
Response
Address
Offset
Offset of the data to return in register units.
Response
Quantity
Quantity of the returned data. Only for string data a value greater than 1 is supported.
TCP Gateway slave number
If you are using a TCP Gateway, you must select the appropriate slave number for
the configuration of the data points.
Addressing:
The information is stored in the Modbus Slave device in 4 different tables. 2 tables store on/off
discrete values (coils) and two store numerical values (registers). Each coil is 1 bit long and
assigned a data address between 0 and 65535. Each register has the size of 1 word(16 bits/ 2
bytes) and has a data address between 0 and 65535.
Coil/ Register numbers Data addresses Function type Table name
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