Extremely low cost
9-pin, 2.2kOhm SIP resistors (not included with board) may be ordered separately: SP-K2.29C (please call 01462 480055 to order)
General Description
The PCI-DIO24/SIPSCKT is a low cost, 24-bit, logic level digital I/O board for PCI bus compatible computers. The PCI-DIO24/SIPSCKT is based on the industry standard 82C55 chip, and the 82C55 I/O pins are brought directly to the board's I/O connector. The 82C55 is a powerful 24 bit chip and functions as two 8-bit ports, (Ports A and B) and a third 8-bit port (Port C) that may be further divided into two 4-bit ports (Port C-HI and C-LO). The CMOS outputs of the 82C55 are suitable for driving a wide array of logic devices, though the chips ±2.5 mA drive capability may not be enough in some applications.
The PCI-DIO24/SIPSCKT is connector and software compatible with Measurement Computing's highly popular ISA based CIO-DIO24 board as well as a host of other 8255 based boards from other vendors.
The board is also supported by a wide variety of external signal conditioning, including electromechanical relay and solid state I/O module racks.
The use of pull-up resistors and pull-down resistors is important if you need to set a fixed default value to keep the input value from floating.
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