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UM0934 bảng dữ liệu(PDF) 95 Page - STMicroelectronics

tên linh kiện UM0934
Giải thích chi tiết về linh kiện  ST7570 S-FSK power line networking System-on-Chip
PDF  113 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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UM0934 bảng dữ liệu(HTML) 95 Page - STMicroelectronics

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UM0934
Extended functions
Doc ID 17389 Rev 2
95/113
Both NTX and NREJ values are programmable by accessing the MIB object 0085h
(Section 6.5.27). Default values are NTX = 8 and NREJ = 9.
Figure 23
shows the transmission of an alarm with default values.
Figure 23.
Alarm transmission
7.2.2
Alarm reception
As soon as a burst of alarms is received, the ST7570 generates a CMD_AlarmIndication
message to the host.
In order to avoid the detection of fake or corrupted alarm messages, the system generates
an indication only if NRX consecutive alarms are received. Parameter NRX is programmable
through the MIB object 0085h (Section 6.5.27).
After the CMD_AlarmIndication message, the ST7570 ignores all the alarms that may occur
in the next NREJ time-slots.
If a CMD_AlarmRequest message is sent during the alarm reception or the reject window,
the ST7570 provides an immediate positive confirmation but it does not transmit any
additional alarms.
Default values are NRX = 2 and NREJ = 9.
Figure 24
shows the behavior of a node (node 2) with NRX = 2, assuming that node 1 is
transmitting an alarm burst (with NTX = 8 and NREJ = 9).
1
2
3
4
5
6
7
8
9
Alarm
Request
1
2
3
4
5
6
7
8
Alarm Transmission (N
TX )
Reject Window (N
RE J)
Alarm
Confirm
Alarm RECEPTION
Alarm IGNORED
Alarm TRANSMISSION



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