QmR Modbus 9-3
9.2 QmR Data Structure for Modbus Access
This section provides a detailed technical reference that maps all QmR data
structures to Modbus registers as an example only. Any subset of this mapping can
be used. The top level categories of QmR data structures are as follows:
• System Control
• System Status
• System Setup
• Test Control
• Test Status
• Test Setup
9.2.1 Modbus ‘Coils’: Discrete Closures
System Control – Discrete Closure data structures of the QmR are available to the
Modbus Master via Modbus discrete signals (“Coils”). The following tables
summarize these control signals with an example mapping. The Modbus Master
has read/write access. All of these are Boolean types that have only a 1 or 0 value.
9.2.2 Modbus Inputs: Discrete Closures
System Status and Test Status Closure data structures of the QmR are available to
the Modbus Master via Modbus discrete signals (Inputs). The following tables
summarize these system and test status signals with an example mapping. The
Modbus Master has read-only access. All of these are Boolean types that have only
a 1 or 0 value.
A default Modbus setup that can be used as-is or a starting point for further
modifications using the built-in QmR mapping tool is provided at "Default
Modbus Setup" on page 9-18.
“Coils”
Address
(decimal)
Name/description of 8-bit values
00001 1 Start Signal – start the test cycle (1 = start, 0 = ignored)
00002 2 Abort Signal – stop the test cycle (1 = abort 0 = ignored)
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