MDR-2000
V3
User's Reference
Manual
Data Collection
exactly the
same
way as the Primary Phone
Number
except that
ifthe
entry is empty no action is
taken. This is the means to suppress the reporting
of
an alarm to a secondary destination.
After the record is sent the MDR-2000 waits for an
ACK
character (06H) to be sent by the host.
If
no
ACK
is sent in approximately 2 seconds the record is retransmitted. Any character other than
the
ACK
also causes the record to be retransmitted. The retransmission will occur up to 10 times
after which the MDR-2000 will simply disconnect.
3.3
External Alarm Generation
On
certain models
of
the MDR-2000, those with 24 external jumpers labeled
'A'
through 'X
',
detection
of
external events is possible.
When
power is first applied to the
MDR-2000
it retrieves
and stores the status
of
the 24 jumpers for reference.
When
the condition
of
one
of
the
jumpers
changes this generates an alarm.
The alarm is reported with a condition code
of
'
M2KEXT
:'
followed
by
the letter corresponding to
the jumper.
If
multiple jumpers change simultaneously then they will all be reported
on
the same
alarm message.
These
jumpers
report a change in the condition
of
the
jumpers
, and give no indication
of
the open or
closed status
of
the jumper. Therefore it is incumbent
on
the implementers
of
the system to ensure
that the initial condition
of
the jumpers is what is expected as normal. The change in
jumper
condition
must
be held for a least
112
second, a feature incorporated to help reduce nuisance alarms
and also to help with the circuit debouncing logic.
In
designing circuitry to open or close the
jumpers
the implementers must be careful
not
to apply
any voltage
or
current to the jumpers that
may
damage the MDR-2000. As a guideline, the circuit
must be equivalent to a dry reed relay contact closure.
3.4
Internal Alarm Generation
The
MDR-2000
has the capability
of
reporting internally generated alarms which result
when
certain conditions internal to the unit occur. These messages are reported in the same format as the
external and
PBX
generated messages described in the previous sections. The following is a
description
of
the internally generated alarms:
3-8
To Next Page
Loading...