Applied Systems Engineering ASE2000

ASE2000 V2 Communication Test Set User Manual 208
29. Modbus–ProtocolSpecic
Most test set operations are independent of the specic protocol being used and are described
in the non-protocol specic topics. The most common protocol specic activity is dening the
message structure for a particular RTU. This involves dening the number and types of points
(analog, digital, and accumulator) congured in the device (RTU, IED) under test. This information
enables the test set to issue the proper data scan request and to parse and correctly display
information in data response messages. The following sections will describe the protocol specic
considerations, if any, for Task and Exchange operational modes and, within those modes, any
communication mode (Line Monitor, Master Simulation, and RTU Simulation) protocol specic
considerations.
29.1. Modbus – Exchange Mode
For Exchange Mode, protocol specic tasks are editing Exchange Denition and setting RTU
address information.
29.1.1. Modbus–EditExchangeDenition
Congure one or more Read exchanges (Read Coil Status, Read Input Status, Read Holding
Reg, Read Input Regs) with device point information. The specic Read exchange(s) to congure
is a function of how points are congured in the device. In the following example, the device
conguration consists of 16 Input Coil points and 8 Analog points in Input Registers.
From the Exchange view, right-click on the line containing the Read Coil Status exchange and
select Edit Exchange Denition.
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