INVT CHE100-011G/015P-4 - Page 121

Communication Protocol
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10.7 Example
10.7.1 RTU mode, read 2 data from 0004H
The request command is:
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
Node address 01H
Command 03H
High byte of start address 00H
Low byte of start address 04H
High byte of data number 00H
Low byte of data number 02H
Low byte of CRC 85H
High byte of CRC CAH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
The reply is :
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
Node address 01H
Command 03H
Returned byte number 04H
Higher byte of 0004H 00H
Low byte of 0004H 00H
High byte of 0005H 00H
Low byte of 0005H 00H
Low byte of CRC 43H
High byte of CRC 07H
END T1-T2-T3-T4 (transmission time of 3.5 bytes)