Siemens KNX EIB TP-UART 2-IC Manual page 24

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
- Frameformat Extended:
Octet 0 Octet 1
Ctrlbyte extCtrlbyte
00R1cc00 Axxx xxxx
a) group (multicast) or broadcast addresses
if (A == 1) then group addressed
=> "addressed"
b) physical addressed (point to point)
if (A == 0) then physical addressed
=> if (destination address == physical address of TP-UART)
=> "addressed"
If the TP-UART is "addressed" and no error occurs then the TP-UART sends an IACK. If the TP-UART
is "addressed" and an error occurs (parity or checksum error) then it generates an INACK.
Note:
Also during activated address evaluation the host is able to manipulate the IACK generation of the TP-
UART by sending the U_AckInformation service.
3.2.3.1.8 U_AckInformation-Service
The U_AckInformation-Service is only sent to the TP-UART if a host controller wants to check the
destination address itself. This service is sent by the host after the address evaluation and must be
sent latest 1,7 ms after receiving the address type octet of an addressed frame. The Nack-/ Busy-/
Addr-Bits sets internal flags in the TP-UART. The NACK flag is set by the TP-UART itself if it is
detecting any frame error.
If the TP-UART receives this service and the addressed bit is set it will generate a ACK, NACK or
BUSY-frame on the EIB depending on the settings of the NACK/busy-flags.
UART-Controlfield
7 6 5 4
0 0 0 1
AckInformation
Fig. 11: U_AckInfo-Service
Technical Manual
page 24
3 2 1 0
0 x x x
Nack Busy Addr
© Siemens AG 2012
Subject to change without further notice.
Octet 4 Octet 5
High byte Low byte
destaddress destaddress
pages 42
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