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MON20/20 Software for Gas Chromatographs User Manual
SEPTEMBER 2010 3-9000-745
7-5
Note
For a direct connection to the GC, ensure that the port setting is the same as the Com ID
number of the serial port used.
4. Click OK.
7.1.3 Getting Modbus Data
To read or write register contents to the GC, or any other device, do the
following:
Note
Before retrieving data, print a GC Config Report (see Section 5.12) and review the
Communication section to learn the variable names that are assigned to the Modbus
registers.
Note
Modbus registers assigned to alarms are application-specific.
1. In the Slave Addr field, type the COM ID of the GC. The Modbus
program will accept a slave address value of 1 to 247.
To use Broadcast Mode, which directs the Modbus program to poll all
known devices, enter 0 in the Slave Addr field. Each device interprets
this poll attempt as an instruction to read and take action; however, a
response message may not be received by the Modbus program.
Note
Changes are applied to the corresponding register value at each device.
Protocol ASCII Modbus
RTU Modbus
Parameter Typical Setting