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7-1
Section 7: Using MON 20/20 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 Using 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 “Assigning scale ranges to User_Modbus
registers” on page 7-15 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 (DCS). To facilitate installation and debugging, the Modbus
program emulates a DCS.
NOT REQIURED FOR NORMAL GC OPERATION
The Modbus Test is reserved for advanced functions. The Modbus Test function is not
required for normal GC operation. Skip this section unless you are developing software,
engaging in a software debugging process, or designing a custom installation that
directly accesses the GC Controller Modbus registers.
CAUTION