40
MDS 4790/9790 Series I/O Guide
MDS 05-3438A01, Rev. F
• If you enter the command with the
[B]
parameter, the response
always applies the the
B
radio.
To determine which radio is the standby, use the
SHOW RADIO
command,
which indicates which radio (
A
or
B
) is
ACTIVE
. It also indicates if the
opposite slot is
INACTIVE
or
NOT EQUIPPED
.
Major Alarm Event
Assignments
AMASK [0000 0000–FFFF FFFF]
Table 10
and
Table 11 on Page 39
list the major and minor alarm clas-
sifications. It is possible to reassign alarm outputs (illustrated in
Figure 19
on
Page 22
) to a different category, and change which alarm
events trigger an automatic switchover in redundant master stations.
However, this should be done rarely, if ever.
The
AMASK
command and
NMASK
command (
Page 49
) reclassify major
and minor alarm events, respectively, changing the alarm output relay
status and switchover conditions. These commands can be used to tailor
a radio’s alarm response. For example, a major alarm at a redundant
master station causes switch-over to the other transceiver board. By
re-configuring a minor alarm as a major alarm, you can force a
switch-over at the occurrence of a (formerly) minor alarm condition.
Reclassifying alarms does not disable alarm notification
. The front
panel
ALARM
LED illuminates, the alarm event is logged, and the
ALARM
and
STAT
commands show the alarm status.
Entering the
AMASK
command alone displays the current setting of
major alarm events in hexadecimal format. Entering the
AMASK
com-
mand followed by an eight-digit hexadecimal number reassigns each of
the 32 possible alarm events as enabled or disabled, with respect to
major alarm output relay status and switchover criteria.
The hex value for the mask corresponds to the hex value for the
ALARM
command (see the
ALARM
command description). Each bit represents a
different major or minor alarm. The most significant 16 bits represent
specific major alarms and the least significant 16 bits represent specific
minor alarms. All major and minor alarms are “set” as the default
AMASK.
NOTE:
GE MDS does not use all bits. Some bits are reserved for
future use.
The default AMASK is FFFF FFFF, which signals an alarm on the data
port pin 25 for all major and minor alarms. To disable the alarm signal
on pin 25 for a specific alarm, reset the bit associated to the specific
alarm and convert back to hex.
Table 10
and
Table 11 on Page 39
pro-
vide the hex and binary values for each alarm code.
Alarm Masks screen
,
Page 75
A
B
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