External Digital I/O; Internal Digital I/O; I 2 C Data Bus; Power-Up Circuit - Teledyne T200 User Manual

EXTERNAL DIGITAL I/O

The external digital I/O controls the Status Outputs and the Control Inputs.

INTERNAL DIGITAL I/O

The internal Digital I/O controls some subsystems, such as the electrical and optical tests,
the PMT preamplifier range control, and the O3 generator.
I C DATA BUS
2
I 2 C is a two-way, clocked, bi-directional digital serial I/O bus that is used widely in
commercial and consumer electronic systems. A transceiver on the Motherboard converts
data and control signals from the PC-104 bus to I
relay board, optional analog input board and valve driver board circuitry.

POWER-UP CIRCUIT

This circuit monitors the +5V power supply during start-up and sets the analog outputs,
external digital I/O ports, and I
instrument software can establish control.
R
ELAY
The CPU issues commands via a series of relays and switches located on a separate printed
circuit assembly, called the Relay PCA (Figure 6-13), to control the function of key
electromechanical devices such as heaters and valves. The Relay PCA receives instructions
in the form of digital signals over the I
activates its various switches and relays appropriately.
The Relay PCA is located in the right-rear quadrant of the analyzer and is mounted
vertically on the backside of the same bracket as the instrument's DC power supplies.
200 Teledyne API T200 NO/NO
C circuitry to specific values until the CPU boots and the
2
PCA
/NO Analyzer with NumaView™ Software
2 x
2 C format. The data are then fed to the
C bus, interprets these digital instructions and
2
083730200A DCN7962