External Digital I/O; I C Data Bus; Power Up Circuit; Power Supply/ Circuit Breaker - Teledyne 100E Instruction Manual

Theory Of Operation Model 100E Instruction Manual
independently. A variety of scaling factors are available, See Section 6.5 for information
on setting the range type and scaling factors for these output channels
Test Output: The third analog output, labeled A4 is special. It can be set by the user (see
Section 7.5.7) to carry the current signal level of any one of the parameters accessible
through the TEST menu of the unit's software.
In its standard configuration, the Analyzer 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 two of these outputs, A1 and A2.
Output Loop-back: All three 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

10.4.12. External Digital I/O

This External Digital I/O performs two functions.
STATUS OUTPUTS: Logic-Level voltages are output through an optically isolated 8-pin
connector located on the rear panel of the analyzer. 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 (see Section 6.8.1).
CONTROL INPUTS: By applying +5VDC power supplied from an external source such as a
PLC or Datalogger (see Section 6.8.2), Zero and Span calibrations can be initiated by
contact closures on the rear panel.
10.4.13. I
2
C Data Bus
2
I C is a two-wire, clocked, bi-directional, digital serial I/O bus that is used widely in
commercial and consumer electronic systems. A transceiver on the Motherboard converts
2
data and control signals from the PC-104 bus to I C. The data is then fed to the
Keyboard/Display Interface (see Section 10.6.1.4) and finally onto the Relay Board.
2
An I C data bus is used to communicate data and commands between the CPU, the
Keyboard/Display Interface and the various switches and relays on the Relay Board.

10.4.14. Power up Circuit

This circuit monitors the +5V power supply during start-up and sets the Analog outputs,
2
External Digital I/O ports, and I C circuitry to specific values until the CPU boots and the
instrument software can establish control.

10.5. Power Supply/ Circuit Breaker

The analyzer operates on 100 VAC, 115 VAC or 230 VAC power at either 50Hz or 60Hz.
Individual units are set up at the factory to accept any combination of these five
attributes. As illustrated in Figure 10-17 below, power enters the analyzer through a
188 045150102 Rev XB1