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MON20/20 Software for Gas Chromatographs User Manual
SEPTEMBER 2010 3-9000-745
7-7
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 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.
7.1.4 Transmitting using a single data type
To assign a data type to a group of registers you will read or edit, 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.
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.