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LIST OF HOLDING REGISTERS OF THE MODBUS PROTOCOL
The parameters of the instrument that can be read or programmed through the communication interfaces
available on the instrument, according to the hardware setup, are listed in the following table.
The registers of the R type are those readable while those of the W type are those writable.
In the case of the Modbus TCP protocol, the instrument address (“Unit Identifier” field) must always be FFh.
If a fieldbus (different from Modbus) is used, only the R or R/W registers will be present in the input
area and only the W or R/W registers will be present in the output area.
The registers have a size of 16 bits.
Address Holding Register
R/W Notes
0001
Register Status
R
See the relevant table
0002
Gross weight (MSW)
R
Value INT. - Most significant word
0003
Gross weight (LSW)
R
Value INT. - Less significant word
0004
Net weight (MSW)
R
Value INT. - Most significant word
0005
Net weight (LSW)
R
Value INT. - Less significant word
0006
(Reserved)
R
0007
(Reserved)
R
0008
Digital inputs on board the MCT 1302
R
See the relevant table.
0009
Digital outputs on board the MCT 1302
R
See the relevant table.
0010
Cell signal
R
Value INT.
0011
Tare (MSW)
R/W Value INT. - Most significant word
0012
Tare (LSW)
R/W Value INT. - Less significant word
0101
Zero control (MSW)
R/W Value INT. - Most significant word
0102
Zero control (LSW)
R/W Value INT. - Less significant word
0103
Unload set point (MSW)
R/W Value INT. - Most significant word
0104
Unload set point (LSW)
R/W Value INT. - Less significant word
0105
Unload prolonged time
R/W Value INT.
0106
Unload end time
R/W Value INT.
0107
End cycle time
R/W Value INT.
0108
Time to enable the end cycle output
R/W Value INT.
0109
Dose end mode
R/W Value INT.
0110
Correction mode
R/W Value INT.
0111
Minimum level (MSW)
R/W Value INT. - Most significant word
0112
Minimum level (LSW)
R/W Value INT. - Less significant word
0113
Maximum level (MSW)
R/W Value INT. - Most significant word
0114
Maximum level (LSW)
R/W Value INT. - Less significant word
0115
Minimum level output
R/W Value INT.
0116
Maximum level output
R/W Value INT.
0117
Cycle output
R/W Value INT.
0118
Cycle end output
R/W Value INT.
0119
Alarm output
R/W Value INT.
0120
Timer mode
R/W Value INT.
0151
Batching start tare
R/W Value INT.
0152
Batching print
R/W Value INT.
0201
Number of recipes in the archive
R
Value INT.
0202
Recipe name (character 01 + character 02) R/W Value INT. To manage the archive from serial item.
0203
Recipe name (character 03 + character 04) R/W Value INT. To manage the archive from serial item.