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MX8000-3EX Installation and Operation Guide
8.8.7
System Messages
The character $01 at the beginning of a data string indicates that the MX8000–3EX is reporting its internal
status. A sample system message is shown in Figure 8–15. Table 8–28 lists the possible system messages
and what format the data can take.
$01 $30 $36 $32 $37 $39 $34 $22 $30 $33 $34 $35 $22 $7A $39 $30 $30 $30 $63 $OD
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Table 8–28 lists the system messages. Some system messages are one byte. Other messages are always sent
with other information, such as the line card number. All system messages are sent separately. For example,
if two line cards have a problem at the same time, the MX8000–3EX will send one message for each
LinePort. The V-Byte and a carriage return ($0D) always follow system messages.
$77
$78
$7B
$7D
$70 + 2 bytes for line card number
$72 + 2 bytes for line card number
$71 + 2 bytes for line number
$73 + 2 bytes for line number
$79 + 4 bytes indicating MX8000. (See
Note below.)
$7A + 4 bytes indicating MX8000.
$7F + 2 bytes indicating the number of the
log on code (not the code itself).
$7E + 2 bytes indicating the number of the
log off code (not the code itself).
Note: The 4 bytes are the ASCII coded values for the model numbers "MX8000". For example, "$79 $39 $38
$30 $30" means "battery trouble with MX8000".
8.8.8
Communication from a Computer to the MX8000–3EX
8.8.8.1
ACKing and NACKing Data
The computer must respond to messages sent by the MX8000–3EX with an ACK or NACK.
An ACK ($06) is sent when the computer's V-Byte calculation agrees with the V-Byte value sent in the
message and the general format of the message looks correct (for example, the last byte was $0D).
A NACK ($15) is sent whenever the computer suspects an error in the transmission of the message. The
computer must respond within one timeout period of receiving the last byte of a message. (See Ack Time
(Acknowledge Time) on page 5–19)
8–28
Date
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Figure 8–15: System Message
Table 8–28: System Messages
SYSTEM MESSAGE
System Message Data
Time
(Battery Restore)
V=Byte
End Of Message
Indicator
MEANING
(PRINTED MESSAGE)
AC LOST
AC RESTORE
COMPUTER TROUBLE
COMPUTER RESTORE
LINE CARD TROUBLE
LINE CARD TRBL RSTR
PHONE LINE TROUBLE
PHONE LINE RESTORE
BATTERY TROUBLE
MX8000–3EX
BATTERY RESTORE
MX8000–3EX
LOG ON OPERATOR
LOG OFF OPERATOR
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Table of Contents
Troubleshooting
