Teledyne T200 Operation Manual page 310

Principles of Operation
13.3.3.4. ANALOG OUTPUTS
13.3.3.5. EXTERNAL DIGITAL I/O
13.3.3.6. INTERNAL DIGITAL I/O
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Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
The analyzer comes equipped with four analog outputs. On the instrument‟s rear panel
analog connector (see Figure 3-4), they are labeled A1, A2, A3 and A4.
CONCENTRATION OUTPUTS: Outputs labeled A1, A2 and A3 carry the
concentration signals of NO
measurement and electronic factors apply to these signals.

See Sections 3.3.1.3 and 5.4 for information on setting the reporting range type and
measurement range scaling factors for these output channels.

See Sections 5.9.3.2 for instructions calibrating and scaling the electronic output of
these channels.
TEST OUTPUT: The fourth analog output, labeled A4 is special. It can be set by the
user (see Section 5.9.4) to carry the current signal level of most of the parameters
accessible through the TEST menu of the unit‟s software.

In its standard configuration, the T200 comes with all four of these channels set up
to output a DC voltage. However, 4-20mA current loop drivers can be purchased
for the first three of these outputs, A1, A2 and A3.
OUTPUT LOOP-BACK: All of the functioning analog outputs are connected back to
the A/D converter through a Loop-back circuit. This permits the voltage outputs to be
calibrated by the CPU without need for any additional tools or fixtures (see Section
5.9.3.4).
This external digital I/O performs two functions.
STATUS OUTPUTS: Logic-Level voltages (0-5 VDC) are output through an optically
isolated 8-pin connector located on the rear panel of the analyzer (see Figure 3-4).
These outputs convey good/bad and on/off information about certain analyzer
conditions. They can be used to interface with certain types of programmable devices.

For information on setting up the status outputs (see Section 3.3.1.4).
CONTROL INPUTS: By applying 5V DC power to these digital inputs from an
external source such as a PLC or Data logger zero point and span point calibrations can
be remotely initiated. .

For information on setting up the status inputs (see Section 3.3.1.6).
There are several internal digital control signals that are generated by the motherboard
under CPU control and used to control subsystems of the analyzer.
ELECTRICAL TEST CONTROL: When the CPU sets this control signal to high
(ON) the electric test feature (ETEST) is initiated (see Section 8.3).

The ETEST can be initiated by following the procedure in Section 12.7.12.2, or by
setting the SIGNAL I/O Function ELEC_TEST to ON.
, NO and NO , respectively.
X 2
A variety of scaling
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