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AcuRev 1300
This chapter introduced how to use software to manipulate the meter through the
communication interface.This chapter content master needs you with MODBUS protocol
knowledge reserves and read through the content of all the other chapters in this manual,
this product features and applications concept has a more comprehensive understanding.
The chapter’s contents include MODBUS protocol, communication format, application
details of AcuRev 1300 series meter.
5.1 Modbus Protocol Introduction
1. Transmission mode
The mode of transmission denes the data structure within a frame and the rules used
to transmit data.
Coding System 8 bit
Start bit 1 bit
Data bits 8 bit
Parity No parity / odd parity / even parity
Stop bit 1bit or 2bit
Error checking CRC
2. Frame
When data frame reaches the terminal unit, it goes through the unit via a special
"port", theunit removes the data frame's header, reads the data, if there is no error, then
it implements the data's task. Afterwards, the unit puts its own data with the acquired
header, and sends back the frame to the sender. The response data frame contains: Address,
Function, Data and CRC Check. Any error will cause a failure to respond.
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