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Example : Read two parameters of AC drive address52(34H) from
CD22. CD22=20.00(07D0H) CD23=30.00(0BB8H).
1. RTU
Computer command message AC drive response message
D1 Address 34H D1 Address 34H
D2 Function 03H D2 Function 03H
D3 Start address (H) 00H D3
Quantity of data
(count by byte)
04H
D4 Start address (L) 16H D4 CD22 content (H) 07H
D5 # of data (H) 00H D5 CD22 content (L) D0H
D6 # of data (L) 02H D6 CD23 content (H) 0BH
D7 CRCL CRCL D7 CD23 content (L) B8H
D8 CRCH CRCH D8 CRCL CRCL
D9 CRCH CRCH
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