XIO-DI8

The XIO-DI8 performs the interface function of isolating and conditioning external input voltage signals into levels compatible with standard 8-bit TTL/CMOS digital ports such as those found on Single-Board-Computers and Microcontrollers. Eight optically isolated and non-polarized input channels allows any combination of DC or AC signals to be monitored.

The input voltage range for each channel is individually configured by means of a socketed resistor. In addition, low-pass filters can be selectively enabled for the reliable measurement of AC or noisy DC signals. The eight conditioned channels form a byte where each bit reflects the state of one input, Bit-0 = IN0, Bit-1 = IN1 and so on. Activated inputs cause a logic "1" to appear in the associated bit position. The byte is buffered and drives one of three possible Host digital input ports.

Which Host port will be driven is determined by installing a single resistor network in one of three corresponding DIP sockets. This routes the output byte to only the designated Host input port. The two remaining Host ports remain unaffected and available for other purposes, including additional XIO family boards.

Connections between the Host and XIO-DI8 is made through dual IDC headers which directly support the two most common pinout arrangements. Other pinouts are easily accommodated using custom cable assemblies. Field wiring is made through a single 16-position removable screw-terminal strip that accepts wires in the range of 12-24 AWG.

The XIO-DI8 operates from a single +5Vdc supply which can be provided by the Host, through either of the IDC headers, or externally by means of a two-position removable screw-terminal strip.

For ease of installation, the XIO-DI8 can be mounted in one of three ways: Placed within a 3" SNAPTRACK^® (121-0024), By using standoffs, or By attaching it to a DIN rail using optional SNAPTRACK^® adapter clips (121-0019).