Kippzonen COMBILOG Data Logger Manual do Utilizador descarregar pdf (Página 108)

SD: Start-Delimiter (length = 1 byte):

The Start-Delimiter SD marks the beginning of a telegram. It

assumes the following values in an ASCII-protocol:

SD request telegram response telegram

with check sum

# >

without check sum $ =

Table 11.8 Start-Delimiter (SD) in the ASCII-protocol

DA: Destination-Address (length = 2 byte):

The Destination-Address DA identifies the communication part-

ner's address, to whom data shall be transmitted or from whom

data shall be requested. Destination-Address can assume val-

ues from 1 to 127 in an ASCII-protocol. The value is here given

as a two-digit ASCII-string (ASCII "01".."7F").

ReqDataUnit: Request-Data-Unit (length = 1 ... n byte):

The Request-Data-Unit identifies a data field in the request

telegram, which contains the data for the communication part-

ner with the DA address.

ResDataUnit: Response-Data-Unit (length = 1 ... n byte):

The Response-Data-Unit identifies a data field in the response

telegram, which contains the data for the calling communica-

tion partner.

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