Modbus communication in AQ-200 series IEDs
devices can communicate using both Modbus RTU serial protocol and Modbus TCP
protocol. Same data can be accessed using both these protocols.
To use Modbus
TCP it can be activated with parameter Modbus
TCP enable in menu Communication à Protocols à Modbus TCP.
Modbus RTU can
be activated with parameter Protocol in menu Communication à Connections.
via Modbus in AQ-200 series can be viewed in the Modbus map. The map can be
opened from ToolsàCommunicationàModbus
Map in Aqtivate
setting tool. Modbus map can be saved into a text file with Save-icon.
In the map
Modbus data is arranged in registers, HR stands for Holding Register and one
register is 16bits. Some data in a protection relay does not map directly to
16bits, therefore there is data that requires more than one register in the
This tool is used to make changes to the register map when communicating using a Modbus protocol. It can be found at Tools > Communication > Modbus configurator
. New modified map can be done by copying the needed rows by dragging from the default map into configurable map and then choosing the wanted holding register for the signals. Full description of the tool can be found in AQtivate instruction manual (downloadable at www.arcteq.fi/downloads
AQwire is a free software developed by Arcteq which can be used for testing Modbus communication. Download the instruction manual and the software at www.arcteq.fi/downloads
. Downloading the software requires you to be logged in.