General Information About Communication With Uss Over Rs485; Structure Of A Uss Telegram - Siemens Sinamics S110 Function Manual

Communication
9.5 Communication using USS
9.5.3

General information about communication with USS over RS485

General information
Communication using the USS protocol takes place over the RS485 interface with a
maximum of 31 slaves. The following character frame applies for the USS telegram:
For information about connection, please refer to the Equipment Manual.
9.5.4

Structure of a USS telegram

Description
The structure of a typical USS telegram is shown in the figure below.
Figure 9-48
Telegrams with both a variable and fixed length can be used. This can be selected using
parameters p2022 and p2023 to define the length of the PZD and the PKW.
The most common application using a fixed length is shown below:
STX
LGE
ADR
Net data
BCC
Total:
642
Header information
STX LGE
Structure of a USS telegram
1 byte
1 byte
1 byte
PKW 8 bytes (4 words: PKE + IND + PWE1 + PWE2)
PZD 4 bytes (2 words: PZD1 + PZD2)
1 byte
16 bytes (LGE indicates 14 bytes, because STX and LGE were not counted
in LGE)
n net data
ADR 1. 2.
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Final
information
: : : n BCC
Function Manual