MON20/20 Software for Gas Chromatographs

User Manual

SEPTEMBER 2010

3-9000-745

 

 

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 –1produces an infinite polling loop that can be terminated by clicking Stop.

7.1.4Transmitting 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.

7-7

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Emerson Process Management 3-9000-745 manual Transmitting using a single data type
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3-9000-745 specifications

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