Auxiliary Inputs and Outputs

File > New Sample [or Open] > Analysis Conditions tab

Analog and digital signals can be connected to the analyzer. Two industry standard D shell connectors are available on the analyzer. A shielded cable with male pins must be used for any auxiliary signal connected to the analyzer. The analog connector uses a 15 pin body; the digital connector uses a 25 pin body. The cable shield must connect to a metal shell D connector housing.

Analog inputs are enabled by marking one or both check boxes on the Insert Experiment window.

Click Insert then select Experiment. After an auxiliary input is enabled, it remains enabled for the duration of the experiment. Because an analysis can be comprised of many experiments, an input can be disabled or enabled at various points in the analysis, as determined by the selection on the New Experiment windows.

Digital inputs are controlled by inserting a Wait step in the analysis. On the Wait window, select Wait for digital input number. Specify 1 or 2 to indicate the input signal. Enter a number of minutes to wait; if the signal is not received before that amount of time elapses, the analysis continues without the input.

Analog and digital outputs are enabled by marking the applicable check box(es) on the Outputs window. The Outputs window is available when setting the initial conditions for an experiment (by clicking the Outputs button on the New Experiment window), or at many other points in the analysis (by inserting a Set Outputs step in the experiment). The state of the auxiliary outputs can be changed frequently throughout the analysis.

The state of the auxiliary inputs and outputs is displayed on the analyzer schematic. Auxiliary signals can be incorporated in reports (overlaid over other data in graphs), in the Results view of the Analysis window (during analysis) and in the Peak Editor.

In the Auxiliary Status Display on the analyzer schematic, a zero or a one is displayed to show the state of each digital output (DO), relay output (RO), and digital input (DI). See Digital.

The voltage is displayed for each analog input (AUX 1 and AUX 2).

Analog

The 15 pin analog connector provides two output signals and two input signals.

Output signals:

  • The TCD signal (could be as high as 12 volts —positive or negative).
  • The sample temperature signal, which is a buffered voltage from the sample thermocouple. The voltage ranges from –0.365 V at –40 °C, 0 at 0 °C, to 10.88 V at 1110 °C. The signal follows the type-K thermocouple nonlinear characteristic.

The signals are available at these pins:

TCD (+) 7

TCD (–) 5

Temp (+) 8

Temp (–) 6

Input signals:

The inputs are available for connection to other detectors, such as a mass spectrometer. The voltage range is –15 to 15 volts. The analyzer application can record these signals at the same time as it records TCD and sample thermocouple data.

The signals connect to these pins:

Auxiliary input 1 (+) 4

Auxiliary input 1 (–) 3

Auxiliary input 2 (+) 2

Auxiliary input 2 (–) 1

All other pins in the 15 pin connector are floating (not connected). Connect the metal shell of the connector to the chassis ground and cable shield to maintain shielding of the signals.

Digital

The 25 pin digital connector provides floating signals to control and monitor external hardware — such as auxiliary detectors or chart recorders.

The outputs consist of four sets of latching relay contacts and four opto-coupled photo transistors. The inputs are two optically isolated photo couplers.

The analyzer application sets these as logic 1 or logic 0 — as defined by the analysis step. They are displayed on the analyzer schematic.

A logic 1 causes the relay to connect the common contact to the normally open contact. The relay will retain this condition even when power to the analyzer is disconnected. A logic 0 causes the relay to connect the common contact to the normally closed contact.

A logic 1 to the opto-coupled outputs causes the NPN photo transistor to be turned on. A logic 0 turns the NPN photo transistor off.

The two opto-coupled inputs are read by the analyzer as logic 1 (when current flows through the opto-coupler photo diodes) or logic 0 (when no current is flowing).

Electrical Specifications

Relays

Maximum voltage = 250 VAC, 48 VDC

Maximum switching current = 4A at 250 VAC; 3A at 30 VDC

Maximum switching current = 100 mA at 100 VDC

Opto-coupled outputs

Maximum voltage: VCE = 70 VDC

Maximum reverse voltage, VCE = 7 VDC

Maximum current = 10 mA

Opto-coupled inputs

Maximum reverse voltage = 3 v

Nominal forward voltage 1.3 v at 10 mA

Minimum current required to be recognized by the analyzer = 1 mA

Digital Connector Pin Designations
Pin Type Function
1 Relay 1 normally closed
2 Relay 1 common
3 Relay 1 normally open
4 Relay 2 normally closed
5 Relay 2 common
6 Relay 2 normally open
7 Relay 3 normally closed
8 Relay 3 common
9 Relay 3 normally open
10 Relay 4 normally closed
11 Relay 4 common
12 Relay 4 normally open
13 Not Used Not used
14 Opto output 1 collector
15 Opto output 1 emitter
16 Opto output 2 collector
17 Opto output 2 emitter
18 Opto output 3 collector
19 Opto output 3 emitter
20 Opto output 4 collector
21 Opto output 4 emitter
22 Opto input 1 anode (+)
23 Opto input 1 Cathode (-)
24 Opto input 2 anode (+)
25 Opto input 2 cathode (-)
 
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