www.accuenergy.com
V: 1.0 Revised: Jan. 2018
63
Appendix
B. Modbus Register Map
This chapter will discuss how to operate the meter via the communication port using
software. Before starting this chapter, you should be familiar with Modbus and read
other chapters of this manual to make sure that you have a good understanding of the
functions and applications of this product.
This chapter includes: Modbus protocol, communication format and communication
address table.
B.1 MODBUS-RTU Protocol
Modbus RTU protocol is used for AcuDC 240’s communication. Data format and error
check methods are defined in Modbus protocol. The half duplex query and respond
mode is adopted in Modbus protocol.
Modbus allows master device (PC, PLC etc.) to communicate with slave devices, it will not
allow data exchange between slave devices. Therefore, terminal devices will not engage
the communication link at initialization, only response to the master’s request.
B.1.1 Transmission Mode
The mode of transmission defines the data structure within a frame and the rules used to
transmit data.
• Coding System 8 bit
• Start Bit 1 bit
• Data Bits 8bits
• Parity Even/ Odd/ None2/ None1
• Stop Bit 1/2bit
• Error Checking CRC
To Next Page
Loading...
Need help?
General
