2 cmd (command code) and data, Cmd (command code) and data -8 – Delta DVP-ES2 User Manual
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D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
4.3.2 CMD (Command code) and DATA
The content of access data depends on the command code. For descriptions of available command
codes, please refer to 4.2.2 in this chapter.
Example: read consecutive 8 words from address 0614H~H61B (T20~T27) of PLC Slave ID#1.
PC→PLC
“ 01 03 06 14 00 08 04 80”
Sent message:
Field Name
Example (Hex)
START
No data input ≥ 10 ms
Slave Address
01
Command code
03
06
Starting Address
14
00
Number of Points
08
CRC CHK Low
04
CRC CHK High
80
END
No data input ≥ 10 ms
PLC→PC
“ 01 03 10 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 72 98”
Feedback message:
Field Name
Example (Hex)
START
No data input ≥ 10 ms
Slave Address
01
Command code
03
Bytes Count
10
Data Hi (T20)
00
Data Lo (T20)
01
Data Hi (T21)
00
Data Lo (T21)
02
Data Hi (T22)
00
Data Lo (T22)
03
Data Hi (T23)
00
Data Lo (T23)
04
Data Hi (T24)
00
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