MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 49
connector pinouts when the unit uses the digital
modem mode. Review the RXLEVEL command on Page 53 and
the TXLEVEL command on Page 59 for guidance on setting
appropriate levels.
9600—9600 bps modem speed (used for MDS 4790A/E and
MDS 9790A)
4800—4800 bps modem speed (used for MDS 4790E)
19200—19200 bps modem speed (used for MDS 4790C)
DEFAULT—Default modem speed for radio (model dependent)
Minor Alarm Event
Assignments
NMASK [0000 0000–FFFF FFFF]
Table 10 and Table 11 list the major and minor alarm classifications. It
is possible to reassign alarm outputs (illustrated in Figure 19 on
Page 22) to a different category, and to change which alarm events
trigger an automatic switchover in redundant master stations. However,
this should be done rarely, if ever.
The AMASK command (Page 40) and NMASK command reclassify major
and minor alarm events, respectively, changing the alarm output relay
status and switchover conditions. Use these commands to tailor a radio’s
alarm response. For example, a major alarm at a redundant master sta-
tion causes switch-over to the other transceiver board. By reconfiguring
a minor alarm as a major alarm, a minor alarm condition can force a
transceiver board switch-over.
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 NMASK command alone displays the current setting of
minor alarm events in hexadecimal format. Entering the
NMASK com-
mand followed by an eight-digit hexadecimal number reassigns each of
the 32 possible alarm events as enabled or disabled, with respect to
minor 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 that is a ‘1’
identifies the associated alarm event as a major alarm. Each bit that is a
‘0’ means that the alarm condition will not cause an alarm output relay
to assert, and will not cause a transceiver board switch over.
Contact GE MDS for more information on configuring the alarm
response.
Alarm Masks screen, Page 75
A
B
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