OMEGA Engineering offers two low-cost, high channel capacity digital input/output TTL interfaces: the DIO-48 (48 digital I/O lines) and DIO-168 (168 digital I/O lines) for the IBM PC/XT/AT and compatibles.

The channels may be configured through software as inputs or outputs in-groups of eight. All I/O lines are TTL level compatible. In addition to the digital I/O lines, the DIO-PC-48 includes six 16-bit counter/timers and the DIO-PC-168 includes three 16-bit counter/timers. The counter timers may be used for event counting, frequency measurement, and generation and general timing applications.

Included are software routines written in Turbo Pascal, C, and BASIC, which may be incorporated into the application program for access to the I/O modules. Instructions for these routines are included with the source code. The DIO-168 includes a resident driver program, which allows I/O module accesses via high level calls and is easily implemented from most languages. The driver is optional with the DIO-PC-48.

For connection to the outside world, OMEGA offers optional outboard products for the DIO-PC-168/48. The
DIO-RLY-24 relay provides 24 SPDT 10 A relays and the DIO-SSS-24 accommodates 24 solid state I/O modules. If high level outputs are not required, the DIO-STB-24, 24 screw terminal board may be used. The DIO-PC-48 can accommodate up to two outboards, while the DIO-PC-168 can work with up to seven outboards.

With DIO-CD24 Series accessory boards, the digital I/O cards may also be used for reading and generating analog signals. Both analog inputs and outputs feature 12-bit resolution with 0-10 V, 0-5 V and + 5 V ranges. Software is included in "C" Pascal and BASIC for interfacing the DIO-CD24 boards with the digital I/O boards. The DIO-CD24 requires 5 V power.