Modbus - Protocol Specific; Modbus - Exchange Mode; Modbus - Edit Exchange Definition - Applied Systems Engineering ASE2000 User Manual

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29. Modbus – Protocol Specific
Most test set operations are independent of the specific protocol being used and are described
in the non-protocol specific topics. The most common protocol specific activity is defining the
message structure for a particular RTU. This involves defining the number and types of points
(analog, digital, and accumulator) configured 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 specific
considerations, if any, for Task and Exchange operational modes and, within those modes, any
communication mode (Line Monitor, Master Simulation, and RTU Simulation) protocol specific
considerations.
29.1. Modbus – Exchange Mode
For Exchange Mode, protocol specific tasks are editing Exchange Definition and setting RTU
address information.
29.1.1. Modbus – Edit Exchange Definition
Configure one or more Read exchanges (Read Coil Status, Read Input Status, Read Holding
Reg, Read Input Regs) with device point information. The specific Read exchange(s) to configure
is a function of how points are configured in the device. In the following example, the device
configuration 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 Definition.
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