Kipp&Zonen COMBILOG Data Logger - Manual (Page 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.
Hardware Manual COMBILOG 1022 108