Teledyne 3000ZA operating instructions 2.3 RS-232 Port, Commands via RS-232 Input

Trace Oxygen Analyzer Installation

3.3.2.3RS-232 PORT

The digital signal output is a standard, full duplex 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 output 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).

Each status output is followed by a carriage return and line feed.

Three input functions using RS-232 have been implemented to date. They are described in Table 3-5.

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 3000ZA implementation.

Table 3-6: Required RS-232 Options

Parameter Setting

Baud 2400

Byte 8 bits

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