Configuring The Hardware; Differential Input Mode; Single-Ended Input Mode; Connecting The Board For I/O Operations - Measurement Computing PCI-DAS1200/JR User Manual

PCI-DAS1200/JR User's Guide

Configuring the hardware

All hardware configuration options on the PCI-DAS1200/JR are software controlled. You can select some of
the configuration options using InstaCal, such as the analog input configuration (16 single-ended or eight
differential channels) and the source for the two independent counters. Once selected, any program that uses the
Universal Library will initialize the hardware according to these selections.

Differential input mode

When all channels are configured for differential input mode, eight analog input channels are available. In this
mode, the input signal is measured with respect to the low input. The input signal is delivered through three
wires:
The wire carrying the signal to be measured connects to CH# IN HI.

The wire carrying the reference signal connects to CH# IN LO.

The third wire is connected to LLGND.

Differential input mode is the preferred configuration for applications in noisy environments, or when the signal
source is referenced to a potential other than PC ground.

Single-ended input mode

When all channels are configured for single-ended input mode, 16 analog input channels are available. In this
mode, the input signal is referenced to the board's signal ground (LLGND). The input signal is delivered
through two wires:
The wire carrying the signal to be measured connects to CH# IN HI.

The second wire is connected to LLGND.


Connecting the board for I/O operations

All I/O signals are brought through a 100-pin high-density connector. The C100FF-x cable is used to connect
field signals to the board. This cable has a pair of 50-pin ribbon cables that are joined at one end to a 100-pin
connector. The first 50-pin cable (pins 1-50) carries the analog signals. The second 50-pin cable (pins 51-100)
carries the digital signals. The 100-pin connector mates with the PCI-DAS1200/JR connector. The two 50-pin
ribbon cables are terminated with standard 50-pin header connectors.
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Installing the PCI-DAS1200/JR