Chapter 1
Introducing the CIO-DIO24H
Overview: CIO-DIO24H features
The CIO-DIO24H is a high-drive TTL board with 24 digital I/O connections, and one 82C55 parallel-interface
chip. The I/O is configured as two 8-bit ports and two 4-bit ports based on an 82C55 mode 0 emulation. Each
port may be individually programmed as input or output.
All digital inputs are LSTTL. The output signals are buffered, high-output drive TTL. The digital output drivers
are 74S244 chips that can sink 64 mA and source 15 mA. The input buffers are 74LS373 chips and have
standard high input impedance of the 74LS series devices.
All I/O bits are set to input mode (high impedance) on power up and reset. If you are using the board to control
items that must be OFF on reset, install pull-down resistors. The board is equipped with open locations where
you can install SIP resistor networks for either pull-up or pull-down.
All signals pass through a 37-pin connector.
Software features
For information on the features of
Insta
Cal and the other software included with your CIO-DIO24H, refer to
the
Quick Start Guide
that shipped with your device. The
Quick Start Guide
is also available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
.
Check
www.mccdaq.com/download.htm
for the latest software version.
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