Model 104-DIO-48S, 48-bit parallel digital input/output card designed for PC/104-based data acquisition, has Change of State (COS) Detection on selected ports, allowing card to generate an interrupt port by port. Since one READ determines the data, there is no need for constant polling, reducing processor overhead and allowing applications to run more smoothly.
Board contains two type 82C55A Programmable Peripheral Interface chips (PPI) to provide computer interface to the 48 I/O lines. Each PPI provides two 8-bit ports on A and B and two 4-bit ports on C; each port can be software configured to function as either inputs or latched outputs. Each I/O line is buffered and capable of sourcing 15mA or sinking 24mA. Pull-ups to 5V on the board are provided for contact monitoring. 104-DIO-48S uses two industry-standard 50-pin headers on board face, plus one 10-pin header for optional counter timer. Included are 1MHz onboard clock and three 16-bit down counters, which can be configured for event counters, frequency measurement, or generating frequency or pulse outputs.
Other features of the Model 104-DIO-48S include:
- Individually enabled or disabled software interrupts on IRQs 2-15, with a status register to determine the source of the interrupt
- Power requirement: +5V @ 200mA, maximum (depending on output configuration)
- Operating temperature range: 0-65°C (-40° to +85°C optional)
- Compatible with Opto-22 and other industry standard I/O racks