Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Command Code, Etx

4 . Communications

4.5Command Code

4.5.1 Command Code: 01, Read Status of Contact (Input point X is not included)

Number of Points (max) = 255 (Dec) = FF (Hex)

Example：Read contacts T20~T56 from Slave ID#1

PC→PLC “:01 01 06 14 00 25 BF CR LF”

Sent message:

Field Name	ASCII
STX	:
Slave Address	01
Command code	01
Starting Address Hi	06
Starting Address Lo	14
Number of Points Hi	00
Number of Points Lo	25
Error Check (LRC)	BF
ETX 1	0D (Hex)
ETX 0	0A (Hex)

Assume Number of Points in sent message is n (Dec), quotient of n/8 is M and the remainder is N. When N = 0, Bytes Count in feedback message will be M; when N≠0, Bytes Count will be M+1.

PLC→PC “:01 01 05 CD 6B B2 0E 1B D6 CR LF”

Feedback message:

Field Name	ASCII
STX	:
Slave Address	01
Command code	01
Bytes Count	05
Data (Coils T27…T20)	CD
Data (Coils T35…T38)	6B
Data (Coils T43…T36)	B2
Data (Coils T51…T44)	0E
Data (Coils T56…T52)	1B
Error Check (LRC)	E6
END 1	0D (Hex)
END 0	0A (Hex)

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