GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Technical Manual pages 42 Siemens AG
Infrastructure and Cities Sector,
Building Technologies
page 28 © Siemens AG 2012 Control Products and Systems
Subject to change without further notice. P. O. Box 10 09 53,
D-93009 Regensburg
control field
FFR1 cc00
data link frame type class repeat flag
FFR1 0000 L_DATA request system set by TP-UART
FFR1 1000 L_DATA request alarm set by TP-UART
FFR1 0100 L_DATA request high set by TP-UART
FFR1 1100 L_DATA request normal set by TP-UART
1111 0000 L_POLLDATA request system priority = 1
Fig. 17: Legal EIB-Controlfield
3.2.3.1.9.2 U_L_DataContinue-Service
The U_L_DataContinue-Service transmits one byte of the contents of an EIB-L_Data-Frame to the TP-
UART. The data-index starts with 1 and the maximum value is 62 depending on the length of the
frame.
UART-Controlfield Additional Information
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
1 0 i i i i i i d d d d d d d d
L-Data Data-Index (1 – 62) EIB-Data Byte for L-Data-Frame
Fig. 18: U_L_DataContinue-Service
3.2.3.1.9.3 U_L_DataEnd-Service
The U_L_DataEnd-Service marks the end of the transmission of the EIB-Frame. After receiving this
service the TP-UART checks the checksum and if correct the transmission starts on the EIB else the
UART returns a state-indication with Receive-Errorflag is set.
UART-Controlfield(80
hex
) Additional Information
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
0 1 l l l l l l c c c c c c c c
L-Data Length (7 – 63) Checksum
Fig. 19: U_L_DataEnd-Service
3.2.3.1.9.4 U_MxRstCnt
This service adjusts the maximum number of repetitions on bus after a frame has not been
acknowledged with IACK. Values from 0 to 7 are separately adjustable for BUSY or INACK. No
acknowledge will be handled as INACK. If the host clears the repetition flag in the U_L_DataStart
service always no repetitions will be sent.
After Reset 3 repetitions are active.
UART-Controlfield (24
hex
) MxRstCnt
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
0 0 1 0 0 1 0 0 c c c 0 0 c c c
Busy Cnt Nack Cnt
Fig. 20:U_MxRstCnt
3.2.3.1.9.5 U_ActivateCRC
This service activates a 16 bit CRC calculation for every received Layer 2 Service from the bus (except
when the TP-UART is Polling Slave or the busmonitormode is active). However the CRC calculation
only becomes active at the host speed of 19200 Baud.
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