Delta DVP-SS2

4. Communications
4-15
4.5.3 Command Code: 03, Read Content of Register (T, C, D)
Example: Read coils T20~T27 from Slave ID#01
PC→PLC “: 01 03 06 14 00 08 DA CR LF”
Sent message:
Field Name
ASCII
STX
:
Slave Address
01
Command code
03
Starting Address Hi
06
Starting Address Lo
14
Number of Points Hi
00
Number of Points Lo
08
Error Check (LRC)
DA
END 1
0D (Hex)
END 0
0A (Hex)
PLC→PC
“:01 03 10 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 B8 CR LF”
Feedback message:
Field Name
ASCII
STX
:
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
Data Lo (T24)
05
Data Hi (T25)
00
Data Lo (T25)
06
Data Hi (T26)
00
Data Lo (T26)
07
Data Hi (T27)
00
Data Lo (T27)
08
Error Check (LRC)
C8
END 1
0D (Hex)
END 0
0A (Hex)