36
Press the [Backspace] or [Escape] button to cancel
this function and return to the Standby mode, or,
press the [Enter] button to print the indicated mes-
sages. When the [Enter] button is pressed, the CPM2
will print the printer messages, starting with the oldest
message. The messages will be printed in red if the
Star DP8340 printer is being used. If the CPM2
receives new alarms from the line card while the
buffer is being printed, the new alarms will be sent to
the printer when the buffer printout is completed.
8.6.5 [E] Examine Printer Messages on Display
Screen
With the CPM2 in the Standby mode, press the [E] key
to review printer messages on the display screen.
When the [E] key is pressed, this message will be dis-
played:
Exam PRINTER msg
LCard#:FF ent:EXE
Enter a hexadecimal number to view the following:
Enter... to view
00
CPM2 internal trouble messages (if any)
01to1E Messages for specified line card
FF
Messages for all line cards
If an error is made in entering the number, simply re-
enter the desired number on the keypad.
Press the [Backspace] or [Escape] button to cancel
this function and return to the Standby mode, or,
press the [Enter] button to view the indicated mes-
sages. When the [Enter] button is pressed, the CPM2
will display the printer messages, starting with the
most recent message. When [Enter] is pressed, a
message similar to this will be displayed:
L01-1234-05
Alarm xx
"xx" indicates the number (in hexadecimal) of printer
messages in the line card buffer.
Press the [Enter] button to scroll through the mes-
sages; the messages will be displayed in order from
the most recent to the oldest. Press the [Backspace]
button to scroll from the oldest message to the most
recent.
When finished viewing the messages, press the
[Escape] button.
8.6.6 [F] Examine Computer Messages on Display
Screen
With the CPM2 in the Standby mode, press the [F] key
to review computer messages on the display screen.
When the [F] key is pressed, this message will be dis-
played:
Examine COM1 msg
LCard#:FF ent:EXE
Enter a hexadecimal number to view the following:
Enter... to view
00
CPM2 internal trouble messages (if any)
01to1E Computer messages for specified line card
FF
Computer messages for all line cards
If an error is made in entering the number, simply re-
enter the desired number on the keypad.
Press the [Backspace] or [Escape] button to cancel
this function and return to the Standby mode, or,
press the [Enter] button to view the indicated mes-
sages. When the [Enter] button is pressed, the CPM2
will display the computer messages, starting with the
most recent message. When [Enter] is pressed, a
message similar to this will be displayed:
1011......0000.A
..03 1.06 xx
"xx" indicates the number (in hexadecimal) of com-
puter messages in the line card buffer.
Press the [Enter] button to scroll through the mes-
sages; the messages will be displayed in order from
the most recent to the oldest. Press the [Backspace]
button to scroll from the oldest message to the most
recent. When finished viewing the messages, press
the [Escape] button.
8.6.7 MLR2E Computer Interface
The CPM2 is able to send alarm messages to a com-
puter connected to the COM1 serial port. This section
describes the communication procedures, and the
communication formats available for use.
8.6.8 Overview of Communication
When the CPM2 receives data from a line card, it for-
wards the data to COM1 and awaits an acknowledg-
ment signal from the computer. If a NAK signal is
received from the computer, the CPM2 will make 4
attempts to send the data. If all four attempts fail,
CPM2 buzzer will sound and the CPM2 will retain the
alarms in its internal buffer until communications are
restored. This routing provides reliable and supervised
communication between the CPM2 and the line
cards. The CPM2 also monitors the connection to the
computer by sending a supervisory “heartbeat” signal
through COM1 every 30 seconds. If the “heartbeat”
transmission determines that the computer is off-line
or disconnected, a message similar to this will be sent
to the printer:
Com#1 Absent!! 09:45-21/09/92
Note that the message indicates the time and date
that communications through COM1 were deter-
mined to be interrupted. When COM1 communica-
tions are re-established, a message similar to this one
will be printed:
Com#1 Restored 09:50-21/09/92
Note that the message indicates the time and date
that communications through COM1 were deter-
mined to be re-established. The “heartbeat” feature
may be disabled if this feature is not compatible with
the central station automation software being used on
the computer.
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