Teledyne Trace Oxygen Analyzer, 3000TA-XL-EU Command Description, Parameter Setting

3 Installation Model 3000TA-XL-EU

	Table 3-5: Commands via RS-232 Input
Command	Description
as<enter>	Immediately starts an autospan.
az<enter>	Immediately starts an autozero.
st<enter>	Toggling input. Stops/Starts any status message output from
	the RS-232, until st<enter> is sent again.

The RS-232 protocol allows some flexibility in its implementation. Table 3-6 lists certain RS-232 values that are required by the 3000TA implementation.

Table 3-6: Required RS-232 Options

Parameter	Setting
Baud	2400
Byte	8 bits
Parity	none
Stop Bits	1
Message Interval	2 secondsWhen CRC opens again,

zero and span are done, and the sample is being analyzed.

Range ID Relays: There are four dedicated Range ID relay contacts. The first three ranges are assigned to relays in ascending order—Low range is assigned to Range 1 ID, Medium range is assigned to Range 2 ID, and High range is assigned to Range 3 ID. The fourth range is reserved for the Air Cal Range (25%).

Network I/O: A serial digital input/output for local network protocol. At this printing, this port is not yet functional. It is to be used in future options to the instrument.

RS-232 Port: The digital signal output is a standard RS-232 serial communications port used to connect the analyzer to a computer, terminal, or other digital device. It requires a standard 9-pin D connector.

The data is status information, in digital form, updated every two seconds. Status is reported in the following order:

•The concentration in ppm or percent

•The range in use (HI, MED, LO)

•The span of the range (0-100 ppm, etc)

•Which alarms—if any—are disabled (AL–x DISABLED)

•Which alarms—if any—are tripped (AL–x ON).

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