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3 Installation Model 3000PA
3-8
Teledyne Analytical Instruments
Note: The Remote Probe connector (paragraph 3.3.3) provides
signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the –C Internal valve
option—which includes additional zero and span gas inputs—
the 3000P automatically regulates the zero, span and sample
gas flow.
Range ID Relays: Four dedicated Range ID relay contacts. The first
three ranges are assigned to relays in ascending order—Low range is as-
signed 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.
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 percent
• The range in use (HI, MED, LO)
• The span of the range (0-10 %, 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.
Four input functions using RS-232 have been implemented to date.
They are described in Table 3-1.
Table 3-1: Commands via RS-232 Input
Command Description
as<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
co<enter> Reports "Raw Cell Output" (current output of the sensor
itself) in µA. For example—
Raw Cell Output: 99 µA.