| 144-Bit Digital I/O Card |
Description
ACL-7122 is a high-density 144-bit Digital I/O card for the IBM PC/AT computer and compatibles. All 144 digital I/O channels can sink 24mA for power control applications. Six 50-pin ribbon connectors are provided on-board, each one serving 24 digital I/O lines that are pin compatible with Opto-22 I/O racks.
ACL-7122 emulates Mode 0 of an 8255 PPI and its pin assignment is fully compatible with Opto-22 I/O rack and modules. Its digital inputs and outputs are TTL-compatible and use 74LS244 driver/buffer circuits to provide high drive outputs. The circuits also demand less current than regular TTL circuits.
With the interrupt control circuitry, either PC0 or PC3 from Port C of the ACL-7122's 8255 PPIs can generate an interrupt request. IRQ3 to IRQ15 can be user selected by jumper setting. You can monitor the digital output status by reading directly from the ACL-7122's output ports.
| What is an 8255 PPI? The 8255 PPI controls 24 bits of digital I/O. It has three 8-bit ports (A, B and C), which can be functionally programmed as either input or output. Ports A and B are always used for digital I/O, while Port C can be configured for digital I/O, control, status or handshaking signals. Although the 8255 has 3 modes of operation, the ACL-7122 only emulates Mode 0 of the PPI. This mode provides simple input and output for each of the three ports. No handshaking is required as data is directly written to or read from a specified port. |
Software
Two software development kits are available for the ACL-7122.
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 programs for the ACL-7122.
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.
Specifications
- PC/AT Bus
- IRQ levels: IRQ3, ..., IRQ15
- Compact Sized PCB
- SMT Component Design
- 144 TTL/DTL compatible Digital I/O Channels
- Emulates six industry standard mode 0 8255 PPI
- Buffered circuits for high driving capability
- Direct interface with OPTO-22 compatible I/O modules and racks
- Programmable interrupt handling
- Output status readback
- Power consumption : +5 V @ 0.9 A typical, 1.1 A max.
- Register compatible with ACL-722 and PCL-722
Ordering Information
ACL-7122 : 144-Bit Digital I/O Card
ACLS-DLL1 : Optional
Software Utility/ACLS-DLL1 Windows 3.x Driver,
C-Library and Example Programs
TB-24R : 24 Relay Output Board
TB-16P8R : 16 Isolated Input & 8 Relay Outputs
TB-24P : 24 Isolated Inputs