Introducing the pcim-dda06/16, Overview: pcim-dda06/16 features, Software features – Measurement Computing PCIM-DDA06/16 User Manual
Page 7: Introducing the pcim-dda06/16 -1, Overview: pcim-dda06/16 features -1, Software features -1
Chapter 1
Introducing the PCIM-DDA06/16
Overview: PCIM-DDA06/16 features
The PCIM-DDA06/16 has six channels of analog output and 24 bits of digital input/output. Analog outputs are
from AD660 DACs, with each output buffered by an OP27. Digital I/O is performed with an 82C55.
Analog output ranges are either Bipolar or Unipolar. Bipolar ranges are ±10 V and ±5 V. Unipolar ranges are 0
to 10 V and 0 to 5 V. You set the analog output range for each DAC with an onboard switch. You set the
analog outputs for simultaneous or individual transfer with an on-board jumper.
The PCIM-DDA06/16 digital I/O lines are a direct interface to an 82C55. The 82C55 is a CMOS chip with
TTL level inputs and outputs. The 8255 can source or sink about 2.5 mA. This is enough to switch other TTL
or similar inputs, but is inadequate to drive relays, LEDs or solid state relays without additional buffering.
The 82C55 digital I/O chip initializes all ports as inputs on power-up and reset.
The PCIM-DDA06/16 digital I/O is controlled by programming the 8255's mode register. There are three
possible modes. The most commonly used mode is Mode 0, simple input and output.
Software features
For information on the features of InstaCal and the other software included with your PCIM-DDA06/16, refer
to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
.
for the latest software version.
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