Functions
8.7 Communication via USS
Control Units CU240S
8-26 Operating Instructions, 11/2006, A5E00766042B AA
8.7.2 User data area of USS telegram
Basic USS parameters
General rule: Index[0] for USS on RS485, Index[1] for USS on RS232.
P2010 USS Baudrate [2400 … 115200] baud
P2011 USS Slave Address: [0 … 30]
P2012 USS PZD Length: [0 … 2 … 8] words
P2013 USS PKW Length: [0, 3 (3 words), 4 (4 words), 127 (variable length)]
P2014 USS Telegram Off-Time: [0 … 65535] ms. ‘0’ = no timeout check!
R2015 Received PZD via USS on RS232
P2016 BICO Selection for PZDs to be sent via USS on RS232
R2018 Received PZD via USS on RS485
P2019 BICO Selection for PZDs to be sent via USS on RS485
r2032 Control Word 1 from USS on RS232
r2033 Control Word 2 from USS on RS232
r2034 Control Word 1 from USS on RS485
r2035 Control Word 2 from USS on RS485
User data structure
The user data area of the USS protocol is used for transferring the application data, which
are parameter data (PKW) and process data (PZD).
The application data occupies the bytes within the USS frame (STX, LGE, ADR, BCC). The
size of the application data can be configured by parameters p2013 and p2012. The
following figure shows the structure and order for the parameter data (PKW) and process
data (PZD).
: : :
: : :
: : :: : :
   S
3=' 3='\3.: 3.:[
3.: 3='
33
S
S
Qp.
'DWD%\WHV
3URWRFRO'DWD
3URWRFRO:RUGV
Figure 8-18 USS Application Data
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