Acces PCI-DIO-24H PCI Bus Digital Input/Output Card

The Acces PCI-DIO-24H is a versatile digital input/output card designed for integration into PCI-bus systems for data acquisition and control applications. This card provides 24 bits of digital I/O, configurable in independent 8-bit or 4-bit ports, utilizing an 8255-5 Programmable Peripheral Interface (PPI) chip. It is compatible with universal PCI, PCI-X, and both 3.3V and 5V PCI-bus slots, offering flexibility in system integration. The PCI-DIO-24H is equipped with buffered I/O lines capable of sourcing up to 32 mA and sinking up to 64 mA, with configurable pull-up resistors on the I/O lines. It also features a resettable fused +5 VDC output for powering external devices. This model is compatible with industry-standard I/O racks from manufacturers such as Western Reserve Controls, Gordos, and OPTO22. Optional 1 MHz or 10 MHz counters are available on certain configurations.

### Technical Specifications

* **Digital I/O Lines:** 24
* **Interface:** PCI Bus
* **Core Logic:** Emulates 8255-5 Programmable Peripheral Interface (PPI) chip, supporting 82C55 Mode 0 programming.
* **Port Configuration:**
* Three independent 8-bit ports (Port A, Port B, Port C).
* Port C can be further divided into two 4-bit nibbles (Port C-HI and Port C-LO).
* Each port or nibble is independently selectable for input or output functions via software control.
* **Buffering:**
* All 24 I/O lines are buffered by type 74ABT245B tristate buffer transceivers.
* I/O buffer enable/disable controlled by program.
* Output drive capability: Sourcing 32 mA, sinking 64 mA.
* Input buffers: 74LS373 chips with high input impedance.
* **Logic Levels:**
* VCCIO configurable via jumper selection: 5V or 3.3V.
* With 5V VCCIO:
* Low Input: ≤ 1.5V, ≤ 2uA.
* High Input: ≥ 3.5V, ≤ 2uA.
* Low Output: ≤ 0.55V @ 64mA.
* High Output: ≥ 2.4V @ -15mA (for 74S244 drivers) or ≥ 3.8V @ 32mA (for buffered outputs).
* With 3.3V VCCIO:
* Low Input: ≤ 0.8V, ≤ 2uA.
* High Input: ≥ 2.0V, ≤ 2uA.
* Low Output: ≤ 0.55V @ 24mA.
* High Output: ≥ 2.4V @ 24mA.
* **Pull-up/down Resistors:**
* Pull-up resistors on I/O lines are present on the card (to +5 VDC).
* Jumper selectable pull-up or pull-down configuration (10k ohm) for Ports A, B, and Port C low/high nibbles.
* **Power Output:**
* Resettable fused +5 VDC output available on the I/O connector.
* Fuse rating: 0.5A, resettable by cycling computer power.
* **Power Requirements:**
* Basic Unit: +5 VDC @ 170 mA (without drawing from auxiliary fused output).
* With one 1 MHz counter: +5 VDC @ 190 mA.
* With three 1 MHz counters: +5 VDC @ 230 mA.
* **Optional Counters:**
* Optional 1 MHz or 10 MHz counters available (based on 82C54 programmable interval timers).
* Timer Range: 48 bits.
* Clock: On-board, 1 MHz crystal-controlled oscillator.
* Active Count Edge: Negative edge (falling edge).
* **Interrupts:**
* INTA# mapped to IRQn via PCI BIOS at boot-time.
* External interrupt input (IR INPUT), polarity programmable.
* User interrupt on Port C bit 3.
* Change of State (COS) interrupt capability on specific models (e.g., PCIe-DIO-24HS).

### Electrical

* **I/O Voltage:** User configurable 3.3V or 5V logic levels.
* **Output Drive:** Up to 32 mA source, 64 mA sink per channel (at 5V logic level).

### Interfaces

* **Bus Type:** Universal PCI, PCI-X, 3.3V/5V compatible.
* **PCI Express Versions:** PCIe-DIO-24D, PCIe-DIO-24H, PCIe-DIO-24HC are available.
* **External Connector:**
* PCI-DIO-24H: 50-pin male connector on the card mounting bracket.
* (Note: Some sources mention a 37-pin D-sub for PCI-DIO-24D, while the PCI-DIO-24H consistently uses a 50-pin connector for external conditioning accessories and I/O racks.)
* **I/O Wiring:** Compatible with industry-standard I/O racks (e.g., Western Reserve Controls, Gordos, OPTO22, Grayhill, Potter & Brumfield) via ribbon cables or direct connection.

### Physical

* **Form Factor:** Half-length PCI card.
* **Dimensions:** 4.80 inches long (122 mm). Some PCIe variants are 4.2 inches seated height.
* **Card Slot Compatibility:** Installs in any 3.3V or 5V PCI-bus slot. PCIe versions are x1 lane and can fit in x1, x4, x8, or x16 PCIe slots.

### Compatibility

* **Operating Systems:** Automatically detected under Windows 95/98/NT/XP. Full support for Windows 7 through 11 (32/64-bit), Server 2008, Embedded, and Compact versions. Support for DOS, Windows 95, 98, Me, NT4, 2000, XP. Linux support available. Embedded OS support includes Windows XPe, WES7, VxWorks.
* **PCI Bus:** Universal PCI, PCI-X, 3.3V and 5V compatible.
* **Industry Standard I/O Racks:** Compatible with racks from Western Reserve Controls, Gordos, OPTO22, Grayhill, Potter & Brumfield.

### Environmental

* **Operating Temperature:** 0°C to 50°C. Optional extended temperature ranges may be available (e.g., -40°C to +85°C for PCIe variants).
* **Storage Temperature:** -20°C to 70°C (PCI) or -55°C to +150°C (PCIe variants).
* **Humidity:** 0 to 90% non-condensing.

Why Choose Aumictech for Acces PCI-DIO-24H?
At Aumictech, we specialize in supplying high-end industrial automation hardware. Whether you need robust digital I/O for control systems, reliable data acquisition for laboratory applications, or seamless integration with existing enterprise infrastructure, our team ensures the Acces PCI-DIO-24H delivers maximum performance for your application.