AccuEnergy AcuDC 210 Series, Руководство пользователя

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AcuDC 210/220 Series
4.1 Modbus Protocol Introduction
The Modbus
TM
RTU protocol is used for communication in the AcuDC 210/220 series
meter. Data format and error check methods are defined in Modbus protocol. The
half duplex query and response mode is adopted in Modbus protocol. There is only
one master device in the communication net. The others are slave devices, waiting
for the query of the master. Only the master device can communicate with slave
devices. The slave devices cannot communicate with each other. They can only
respond to the query of master device.
1. Transmission mode
The mode of transmission defines the data structure within a frame and the rules
used to transmit data. The mode is defined in the following which is compatible
with Modbus RTU Mode*.

Coding System 8bit

Parity None

Start bit 1bit

Stop bit 1bit

Data bits 8bit

Error checking CRC