MODBUS TEST 10-7
MON2000
JULY 2010 Getting Modbus Data
10.3 GETTING MODBUS DATA
Use the following steps to read or write register
contents to the GC Controller (or any other
device). See the following subsections for
additional details.
Before retrieving data, print a PC Config
Report (see Section 2.16.3) and check the
Communication data for variable names
assigned to the Modbus registers.
1. In the Slave Addr data field, type the Comm
ID of the GC unit (or other device). WinMB
will accept a slave address of 1 to 247.
Enter “0” to use the broadcast mode. In the
broadcast mode, WinMB polls all known
devices. Each device interprets this message
as an instruction to read and take action;
however, a response message may not be
received by WinMB.
To access previous
settings, use the spin
arrows to view and select.
Any change is applied to the
corresponding register value at
each device. Table 10-4
shows which function codes
support the broadcast mode.