AccuEnergy Accuvim II User Manual - page 32

Ethernet Modual

2. Format of communication

Explanation of frame

Transaction 

identifier hi

Transaction 

identifier lo

Protocol 

identifier hi

Protocol 

identifier lo

Length hi Length lo

Unit 

identifier

00H

00H

00H

00H

00H

06H

01H

Fun

Data start reg hi

Data start reg lo

Data #of regs hi

Data #of regs lo

03H

40H

00H

00H

48H

Table 3-4

As shown in table 3-4 the meaning of each abbreviated word is:

Transaction identifier hi: Transaction Identifier high byte 

Transaction identifier lo: Transaction Identifier low byte 

Protocol identifier hi: Protocol Identifier high byte 

Protocol identifier lo: Protocol Identifier low byte 

Length hi: length high byte

Length lo: length low byte

Unit identifier: slave address

Fun: function code 

Data start reg hi: start register address high byte 

Data start reg lo: start register address low byte 

Data #of regs hi: number of register high byte 

Data #of regs lo: number of register low byte