Programming
EPM2000/EPM2000e Reference Guide
48
MISSING DATA
Note: Information in this section pertains to Version 4.32 or higher firmware only.
FIFO FULL CONDITION
Under various measurement conditions, the pulse data communication buffer—or FIFO—may
become full. This causes pulse measurement data to be lost.
The EPM2000 has several means of alerting users to this type of situation:
1. Replacing the measurement value on the display with the word FULL.
2. Emitting an audible beep (if the beeper is enabled).
3. Alerting the host to the full condition (if host communications are enabled) by either:
· Placing the word FULL in the output data stream (if the host output format is ASCII
or ASCII+)
or
· Placing a hex 10 value in the output data stream (if the host output format is binary).
The hex 10 value is the only remaining binary status value that can hold a special
meaning—it represents missing or invalid data.
When the firmware detects a full condition, the FIFO clears and the system resynchronizes. Any
pulse data stored at the time the FIFO clears, is deleted.
COMMUNICATIONS BUFFER OVERRUN
Under certain conditions of heavy processing load and with host communications enabled, the
EPM2000 may generate measurement data at a rate faster than the communication port allows. If
the host output format is ASCII or ASCII+, the word OVERRUN appears in the output data stream.
If the host output format is binary, a hex 10 value appears in the output data stream. Buffer overrun is
most likely to occur when RS-232 communications is enabled at slower baud rates (9600 baud, for
example).
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