Siemens SINEC L2

S5-95U, SINEC L2 Data Transmission by Accessing Layer 2 Services
8.2 Types and Characteristic Features of the Layer 2 Services
You have the following layer 2 services at your disposal:
Table 8-1. Layer 2 Services of the L2 Interface of the S5-95U
When Do You Use this
Layer 2 Service?
SDA
(Send Data with
Acknowledge)
Layer 2 Service Service can be Used if
the S5-95U is
Active Passive
Description in
Section
Active station sends data
to one active or passive
station.
SDN
(Send Data with No
Acknowledge)
Active station sends data
to one or more active or
passive stations.
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X
X
8.5
8.6
SRD
(Send and Request
Data with Reply)
Active station sends data
and/or fetches data from
one active or passive
station.
X 8.9
RUP_SINGLE
(Reply UPdate
SINGLE)
Active or passive station
holds data so that they can
be fetched once by an
active station.
Active or passive station
holds data so that they can
be fetched several times
by one or more active
stations.
RUP_MULTIPLE
(Reply UPdate
MULTIPLE)
X
X X
X 8.7
8.8
EWA 4NEB 812 6112-02 8-5