User Manual

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Siemens AG pages 42 Technical Manual
Infrastructure and Cities Sector,
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Control Products and Systems © Siemens AG 2012 page 29
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The TP-UART calculates over the complete received telegram (including the Layer 2 checksum) a
CRC16-CCITT with the following parameters:
- Width= 16 bit
- Truncated polynomial = 1021hex
- init value = FFFFh
- I/O not reflected
- no xor on output CRC
- Test string „123456789“ is 0xE5CC
and adds it to the receiving frame (sending order is highbyte then lowbyte).
After Reset CRC calculation is disabled.
UART-Controlfield (25
hex
)
7 6 5 4 3 2 1 0
0 0 1 0 0 1 0 1
Fig. 21: U_ActivateCRC
3.2.3.1.9.6 U_PollingState
This service must be send to the TP-UART if an Pollingframe-Ctrlbyte is received. If the TP-UART
detects a collision during sending the slave slot to the EIB the TP-UART generates a State indication
with the Slave Collisionflag set.
UART-Controlfield Polling Address high
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
1 1 1 0 s s s s c c c c c c c c
Slotnumber
Polling Address low Pollingstate
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
c c c c c c c c c c c c c c c c
Fig. 22: U_PollingState-Service
Ctrl-Byte Src-Addr Src-Addr PollAddr PollAddr
Receive from Bus s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s
Ctrl-Byte
Send to Controller s 0 1 2 3 4 5 6 7 p s
PollCtrl+Slotnr PollAddr PollAddr
Rec from Controller s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s s 0 1 2 3 4 5 6 7 p s s
Send to Bus