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Power System Troubleshooting
B-3
B.1.1 Brief Data Packet
Data packets sent from the power regulator in response to a B (brief cur-
rent status) command are a stream of nine ASCII characters consisting of
four parts:
1.
Packet header - One ASCII character. The power regulator transmits
an A, B, or C, depending on its slot position.
2.
Packet Data - Two ASCII characters representing the remaining bat-
tery capacity in minutes.
3.
Packet State - Four ASCII characters which provide the heatsink
status, battery pack state, test status, and power supply state.
4.
Packet Terminator - Two ASCII characters representing the checksum
to determine data packet errors.
Figure B-2 shows the brief data packet structure.
Table B-1 lists the meaning of each value in the following example of a
brief data packet:
The character format is 8 bits, no parity, with one stop bit. The baud rate
is 9600.
Table B-1
Sample Brief Packet Information
A|23|0|-|P|1|84
Character
Value
Information
1
A
Data packet from power regulator A
2–3
23
Battery capacity remaining = 23 minutes
4
0
Heatsink temperature within range
5
–
Battery pack discharging
6
P
Last battery pack test completed successfully
7
1
BBU mode
8–9
84
Checksum value
Содержание VAX 10000
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