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AcuRev 1300

intothe most signifcant bit (MSB) position. The LSB is extracted and examined, if the LSB

equals to 1, the register is exclusive ORed with a preset, xed value; if the LSB equals to

0, noaction will be taken. This process is repeated until eight shifts have been performed.

Afterthe last (eighth) shift, the next 8-bit byte is exclusive ORed with the register’s current

value, and the process repeats for eight more shifts as described above. The nal contents

of the register, after all the bytes of the message have been applied, is the CRC value.

Whenthe CRC is appended to the message, the low-order byte is appended rst, followed

by the high-order byte.

5.2 Communication Format

This section is for instance will be as far as possible use as shown in table 5-3 format, (as hexadecimal

Numbers).Table 5-3 Protocol IIIustration

Addr: Slave device address

Fun: Function Code

Data start reg hi: Start register address, high byte

Data start reg lo: Start register address, low byte

Data #of reg hi: Number of registers, high byte

Data #of reg lo: Number of registers, low byte

CRC16 Hi: CRC high byte

CRC16 Lo: CRC low byte

1. Read Data (Function Code 03H)

Query:

Addr Fun

Data start

reg hi

Data start

reg lo

Data #of regs

Data #of

regs lo

CRC16

06H 03H 00H 00H 00H 21H 84H 65H

AccuEnergy AcuRev 1300 User Manual

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