Delta DVP-ES2 User Manual download pdf (Page 615)

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4. Communications

4.5 Command 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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Delta DVP-ES2 User Manual Page 615

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