Kipp&Zonen COMBILOG Data Logger - Manual (Page 122)

A DSAP - respectively SSAP-entry is identified by setting the
highest bit in the address byte of Destination-Address (DA) or
Source-Address (SA) respectively. The entry itself is carried
out in the first, resp. the second position in the ReqDataUnit
data field.
The DSAP- and SSAP-entries in the request telegram also ap-
pear in the response telegram, where DA, SA, DSAP and
SSAP in the response telegram correspond to SA, DA, SSAP
and DSAP in the request telegram!
If no storage expansion is carried out in the request telegram,
the orders are carried out via the Default-SAP. The Default-
SAP has the number 0. It does not have to be indicated separ-
ately in the telegram.
DSAP and SSAP entries are only possible with telegrams with
data field (SD2 and SD3 telegrams).
Hardware Manual COMBILOG 1022 122