MDR-2000
V3
User's Reference Manual
Overview
The MDR-2000 communicates with the PBX via an RS232-C compatible port. Communications
with downstream processing facilities is made possible by using another RS232-C port via direct
connection or modem. The MDR-2000 can be setup to communicate at speeds up
to
19200 Baud,
but
is
limited by the data capability
of
the downstream facilities to accept the data at the higher
speeds, the modem equipment and the quality
of
the transmission lines.
To ensure data integrity, the data transmitted to the downstream processing unit is encapsulated in a
data packet. The packet contains byte count and checksum information to provide error detection
capability.
If
an error is detected by the software the MDR-2000 is requested to send the packet
again. This feature is important in ensuring the integrity
of
the downstream report processing.
While the MDR-2000 is transferring data downstream it continues to collect and process informa-
tion from the PBX. This facility means that prime-time data collection from the MDR-2000 is
practical.
The unique design
of
the MDR-2000 incorporates the use
of
hardware and software
to
isolate
internal data integrity violations. This means that the data stored in the MDR-2000 is interrogated
upon transmission to downstream facilities to ensure that what was originally stored in the MDR-
2000's large buffer memory
is
in fact unaltered when selected for transmission.
Commands by the downstream processing unit to the MDR-2000 or by technicians for remote
diagnosis are very simple. Commands exist in two command structures, computer-to-computer
and interactive.
By using groups
of
computer-to-computer commands the MDR-2000 will perform all
of
the func-
tions necessary for automatic data collection. These commands provide the functionality listed
below.
Communications Commands:
o Send the current record or block
of
records to the downstream processing system.
o Advance to the next record or block
of
records.
o Clear all
of
the previously transmitted records. This command makes room for new records .
.
-
o Reset to the beginning
of
the buffer. This command helps recover records lost due to down-
stream processing failures.
o Doorbell. This command returns a simple 'Hello' response to ensure that a connection to the
MDR-2000 has been made.
2-2
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