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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)

4-13

1 2 ... 610 611 612 613 614 615 616 617 618 619 620 ... 701 702

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Delta DVP-ES2 Manuale Utente Pagina 615

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