ACL-7124
24-Bit Digital I/O Card

Compact Size, Low Cost, Easy to Use!!

Features

• 24 TTL/DTL Compatible Digital I/O Channels
• Emulates Industry Standard Mode 0 of 8255 PPI
• Buffered Outputs for High Drive Capability
• Directly Interfaces with Opto-22 Capability
• Programmable Interrupt Handling
• Output Status Readback
• Fully Compatible with ACL-724 and Advantech's PCL-724

Hardware Description

The ACL-7124 offers 24 programmable digital I/O channels on a compact card for the IBM PC/AT/XT and compatibles. These 24 channels emulate the operation of an 8255 Programmable Peripheral Interface (PPI) in mode 0. It can directly control Opto-22 compatible I/O racks and modules through a 50-pin ribbon connector.

• Digital I/O
  The ACL-724 has 24-lines of digital inputs and outputs which are TTL compatible and use 74LS244 drive/buffer chips to provide high output drive. The chips also demand less current than regular TTL circuits. All of the I/O lines can sink up to 24mA, which provides a higher driving capacity than the 8255 chip.

• Interrupt Control
  With the interrupt control circuitry, an input channel PC0 from Port C of the 8255 PPI can generate an interrupt request. An on-board jumper (JP1) can be used to select interrupt IRQ2 through IRQ7. In addition, the interrupt capability of PC0 can also be enabled, programmed or disabled by a jumper.

• Read-Back
  The output status can be read back directly from the corresponding output port. This allows monitoring the outputs via the software.

• Power Consumption
  +5V @ 500mA Typical, @ 800mA Max.

• Program Library & Examples
  An extensive library of functions are available that support Microsoft C and Borland C/C++. Example programs are included to demonstrate how to write C program for the ACL-7124.

• Windows 3.x Driver (ACLS-DLL1)
  The ACLS-DLL1 is a high performance Windows driver for digital I/O functions. It supplies a DLL that can be accessed from C, C++ and Visual Basic under Windows 3.x environment.

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