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7 Tools
The options in the Tools pull-down menu allow you to do the following:
• Use the Modbus Test program to confirm that data is being accurately relayed from
the gas chromatograph to the PC.
• Manage users.
• Adjust the sensitivity of the LOI keys.
• Install upgrades to the GC.
7.1 The Modbus Test program
Use the Modbus program to poll the GC’s Modbus registers (or registers from another
device) to confirm that data is accurately relayed from the gas chromatograph to the PC.
Then, as necessary, assign data types to the returned data. See Section 7.1.9 for more
information. You can save all settings to a file for future reference.
You can use this program to facilitate software debugging or for special installations. With
this program, you can troubleshoot any device that employs registers including the GC, an
ultrasonic meter, or a flow computer.
Traditionally, Modbus registers are polled by using a data collection system. To facilitate
installation and debugging, the Modbus program emulates a Modbus master.
CAUTION!
Only one Modbus master should be connected to a single serial link at a time.
This section provides detailed instructions for using the Modbus program. Use this
program only if you are familiar with Modbus communication protocol and the operation
of MON2020.
7.1.1 Modbus protocol comparison
The GC and the Modbus test program can accommodate two different Modbus protocols:
SIM_2251 and User_Modbus. Some settings depend on which Modbus protocol is used.
The protocol you need depends, ultimately, on the hardware used for data acquisition
from the GC Modbus register contents.
The following comparison should help clarify the differences between the two protocols as
well as the utility of each.
Tools
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Tools
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