Fluid Components International ST100 Series Modbus - Manual (Page 8)

ST100 Series Modbus Operation
4 Fluid Components International LLC
ST100 Modbus Service Registers
The ST100 Modbus supports the new service registers which are ‘Reset Totalizer’ and ‘Start-Stop totalizer’.
• Reset Command for Totalizer
The ST100 can manually ‘reset’ the totalizer number by using Function 03 holding command through 4117 integer register. This is a write
only command. If another master has control on write, then function will return with a “write protected” error message.
• Start and Stop Command for Totalizer
The ST100 can manually ‘start’ or ‘stop’ the totalizer number by using Function 03 holding command through 4118 integer register. This is
a read/write command. If another master has control on write, then function will return with a “write protected” error message.
Service and Setup Functions
Variable / Parameter Modbus Slave Register Data Type Access
Totalizer Reset
To reset the totalizer write the value of
4117 INTEGER
WRITE ONLY
(Function 03)
Totalizer Start/Stop
To start the totalizer enter a value of 1
To stop the totalizer enter a value of 0
4118 INTEGER
READ/WRITE
(Function 03)
READ
(Function 04)
Totalizer 1 Max MS 4115 FLOAT
READ/WRITE
(Function 03)
Totalizer 1 Max LS 4116 FLOAT
READ/WRITE
(Function 03)
Service Data - Table 2
Examples of Totalizer Service Registers using MODSCAN 32
1. How to check the totalizer value?
Figure A
1A. To read the totalizer value, open ModScan32 program and set the data definition (register #4111 and #4112) as shown in Figure A
below.