NCN5121 Datasheet, PDF (42/57 Pages) ON Semiconductor – Transceiver

NCN5121
Host Ctrl
NCN5121
U_L_DataStart .req
1 00 000 00
Control Byte
x x xx x xx x
U_L_DataCont .req
10i i i i i i
Data Octet 1
x x xx x xx x
KNX Bus
U_L_DataOffSet .req
0 00 01 i i i
U_L_DataCont .req
10i i i i i i
Data Octet N
x x xx x xx x
w2.6 ms silence
U _L_DataEnd .req
01l l l l l l
Checksum
x x xx x xx x
L_Data . ind
x 0 r 1 p1 p0 0 0
Data Octet 1
x x xx x xx x
Data Octet N
x x xx x xx x
Checksum
x x xx x xx x
CRC−CCITT High Byte
x x xx x xx x
CRC−CCITT Low Byte
x x xx x xx x
L_Data .con
x 00 010 11
Control Byte
xx xx xxx x
Data Octet 1
xx xx xxx x
Data Octet N
xx xx xxx x
Checksum
xx xx xxx x
Immediate Ackn
xx xx xxx x
Figure 46. Send Frame, 9−bit UART Mode, Frame End with Silence, with CRC−CCITT
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