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Model 300E Carbon Monoxide Analyzer
Instruction Manual
Operating Instructions
P/N 04288 REV: A
61
6.3.6.
Communications Menu (COMM)
The M300E comes with 2 serial communications ports located on the rear panel.
The serial communication ports can be configured to use several different
communications protocols. By default the COM1 port is setup to use RS-232 and
COM2 port is configured to be a half-duplex, RS-485 port but can be configured to
be either a second RS-232 or, with the optional Ethernet interface, a 10BaseT
connection.
See Section 6.8 for more information on setting up these COM Ports.
6.3.7.
M300E Internal Variables
The M300E has several user adjustable software variables.
Table 6–4: Variable Names (VARS)
Variable Description
Legal
Values
DAS_HOLD_OFF
Internal Data Acquisition System holdoff timer:
No data is stored in the iDAS channels during situations
when the software considers the data to be questionable
such as during warm up of just after the instrument
returns from one of its Calibration mode to SAMPLE Mode
May be set for
intervals between 0.5
– 20 min
DYN_ZERO
When ON, this function causes the analyzer to
automatically adjust the SLOPE and OFFSET of its
measurement calculation as the last step when
performing an AutoCal (see Section 7.4).
When DYN_ZERO is turned OFF, this data must be
updated manually.
OFF / ON
DYN_SPAN
When ON, this function causes the analyzer to
automatically adjust the SLOPE and OFFSET of its
measurement calculation as the last step when
performing an AutoCal (see Section 7.4)
When DYN_SPAN is turned OFF, this data must be
updated manually.
NOTE: USE OF DYN_SPAN FEATURE IS NOT
ALLOWED FOR APPLICATINS REQUIRING EPA
EQUIVALENCY.
OFF / ON
CLOCK_ADJ
Changes rate of the time-of-day clock to compensate for
variation in the internal Time of Day clock of each
analyzer.
-60 to 60 sec/day
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