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10-8 MODBUS TEST
MON2000
Getting Modbus Data JULY 2010
2. Use the Function pull-down menu to select
the desired read or write option.
3. In the Data Addr data field, type the
starting register.
Note that the data type is set automatically
by WinMB, per the specified data address.
Use the Data Type pull-down menu to select
a different data type for these registers.
To select data types for SIM_2251 registers
1000 to 9000, see Section 10.3.2.
4. In the Quantity data field, type the number
of registers to be retrieved (range from 1 to
2016).
Table 10-4 Available Modbus Function Codes
Function Code Description Broadcast
1 (Read Coil) read one or more coil values
3 (Read Reg) read one or more register values
5 (Set Single Coil) set (write) one coil value
5 (Set Single Reg) set (write) one register value
15 (Set Multiple Coils) set (write) multiple coil values
16 (Set Multiple Regs) set (write) multiple register values
Table 10-5 Default Data Type per Register Range for SIM_2251
Register Range Default Type
1000 – 2999 Boolean
3000 – 4999 Integer
5000 – 6900 Long
7000 – 8999 Float
To ensure best data type
assignments, review a PC
Config Report (see
Section 2.16.3 to view a
live report; see Section 7.1
to view a report file; see
Appendix A for a sample
report).