Drive response messages need to be same
as command message when do communica-
tion loop detection.
Ex. Computer commands the address 52(34H) driver, data1=11,
data2=22, data3=33, data4=44
1. RTU
53
(3) 08H : Communication loop detection
Computer command message
D1 : Communication address
D2 : Function code
D3 : Data 1
D4 : Data 2
D5 : Data 3
D6 : Data 4
D7 : CRCL or LRC (H)
D8 : CRCH or LRC (L)
(0~FFh)
(08h)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
Drive response message
D1 : Communication address
D2 : Function code
D3 : Data 1
D4 : Data 2
D5 : Data 3
D6 : Data 4
D7 : CRCL or LRC (H)
D8 : CRCH or LRC (L)
(0~FFh)
(08h)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
(0~FFh)
Computer command message Drive response message
D1 Address 34H D1 Address 34H
D2 Function code 08H D2 Function code 08H
D3 Data 1 11H D3 Data 1 11H
D4 Data 2 22H D4 Data 2 22H
D5 Data 3 33H D5 Data 3 33H
D6 Data 4 44H D6 Data 4 44H
D7 CRCL CRCL D7 CRCL CRCL
D8 CRCH CRCH D8 CRCH CRCH
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