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1. AD MODBUS
1-1. Overview
AD series use MODBUS protocol with RS-485 physical layer for communication.
Transmission mode of MODBUS protocol is supported only by MODBUS-RTU
(MODBUS-ASCII is not supported). MODBUS use the single master / multi-slave
communication method. In MODBUS protocol, only the master device sends the query,
and the slave device specified (unicasted) by master device return the response.
In the case of queries to all slave devices (broadcast), each slave device performs
query processing but does not return the response. If the slave device receives the
incorrect query frame, the slave device discards the query and waits for the next query.
AD operates as a MODBUS slave device.
By MODBUS communication, it is possible to monitor the operation status and to
change various settings of AD.
Wiring / connection of communication system
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