GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Siemens AG pages 42 Technical Manual
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems © Siemens AG 2012 page 27
P. O. Box 10 09 53, Subject to change without further notice.
D-93009 Regensburg
immediate Ack-Info
immediate Ack
1. Databyte
TP-UART
Chksum
2. Databyte
1. Databyte
Ctrl-Byte
Chksum
2. Databyte
Ctrl-Byte
.
.
.
.
EIB
HOST
Fig. 15: TP-UART receive telegram
3.2.3.1.9.1 U_L_DataStart-Service
The U_L_DataStart-Service initialize the TP-UART-IC to receive a complete EIB-Linklayer-Frame from
the host. As additional data the EIB-Control-byte is transmitted which is the control field of the L_Data-
frame or L_Polldata-frame. If the repetition flag in the control byte is just cleared the TP-UART
transmits the frame only once time with repetition flag set.
UART-Controlfield (80
hex
) Additional Information
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
1 0 0 0 0 0 0 0 F F R 1 c c 0 0
L-Data Data-Index 00 = Start EIB-Controlfield
Fig. 16: L_DataStart Service
FF = Frame Format
10 Standard Length L_DATA service
00 extended L_DATA service
11 L_POLLDATA service
R = Repeatflag (on the EIB 1 = not repeated, 0 = repeated)
1 = repeat the telegram on the EIB (see U_MxRstCnt service, default 3 times)
send first time with repeatflag = 1 and repeat with repeatflag = 0
0 = don’t repeat the telegram on the EIB; send only one time with repeatflag = 1
cc = class
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