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KNX EIB TP-UART 2-IC
HOST
Ctrl-Byte
1. Databyte
2. Databyte
immediate Ack-Info
.
.
Chksum
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
7
6
5
4
1
0
0
0
L-Data
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
Siemens AG
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems
P. O. Box 10 09 53,
D-93009 Regensburg
TP-UART
)
hex
3
2
1
0
0
0
0
0
Data-Index 00 = Start
© Siemens AG 2012
Subject to change without further notice.
Ctrl-Byte
1. Databyte
2. Databyte
.
.
Chksum
immediate Ack
Additional Information
7
6
5
4
F
F
R
1
EIB-Controlfield
pages 42
GAMMA instabus
Release: February 2012
EIB
3
2
1
0
c
c
0
0
Technical Manual
page 27
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