Filter
Top Products
Special offers from our partners!
Find Replacement BBQ Parts for 20,308 Models. Repair your BBQ today.
2. Select the desired read or write option from the Function pull down menu.
Function Code Description Broadcast
1 (Read Coil) Reads one or more coil values.
2 (Read Input Status) Reads one or more input status values.
3 (Read Multiple Regs) Reads one or more register values.
4 (Read Input Regs) Reads one or more input register values.
5 (Set Single Coil) Set (write) one coil value
6 (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
3. Type the starting register value in the Data Addr field.
Note
The data type is set automatically by the Modbus test program, based on the specified data
address.
4. In the Quantity field, type the number of registers to be retrieved.
The Modbus test program will accept a quantity value of 1 to 2016. The requested
number of registers cannot exceed the amount contained by the selected message
block but you can retrieve a partial block. You cannot cross a message block
boundary.
Also, in Standard Modbus mode each register is 16 bits. Therefore, integers (SHORT)
consist of 1 register while floats (FLOAT) and long integers (LONG) consist of 2
registers.
Note
Boolean registers are not user-defined (for either SIM_2251 or User_Modbus) and primarily
contain alarm flags useful for debugging. To view the contents of Boolean registers, select the
1 (Read Coil) function code.
Numeric registers for User_Modbus can be user-defined. To view the contents of Numeric
registers, select the 3 (Read Regs) function code.
5. Type the desired repeat count, which is the number of times the Modbus program
should read or set the specified registers before ceasing transmission, in the Repeat
field.
The Modbus test program will accept a repeat value of 1 to 9999. A value of –1
produces an infinite polling loop that can be terminated by clicking Stop.
6. Select the Use <data type> to decode registers check box.
7. Select a data type from the pull-down menu.
Tools
7
Tools
159