48-Bit Digital I/O Card

• Compact size (suitable for any size of chassis)
• 32-bit PCI-Bus, Plug and Play
• 48 TTL/DTL compatible digital I/O lines
• Emulates Two industry standard mode 0 of 8255 PPI
• Buffered circuits for higher driving
• Direct interface with OPTO-22 compatible I/O module
• Programmable interrupt handling
• Output status readback

The PCI-7248: 48-Bit Digital I/O board is a high density parallel Digial I/O board for PCI computer in industrial applications. All 48 digital I/O channels can sink 24mA for power control application.

Parallel Digital I/O
This board provides 2 ports that emulate industry standard 8255 Programmable Peripheral Interface (PPI) chips, each offers 3 ports; PA, PB, and PC. PC is subdivided into 2 nibble-wide (4-bit) ports. Each channel has an individual connector with OPTO-22 pin assignment. It is very essential to use isolated input to prevent the grond loop problems.

PCI-Bus Plug and Play
The PCI-7248 uses SAIC PCI controller to interface the board to the PCI bus. The ASIC fully implement the PCI local bus specification Rev 2.0. All bus relative configuration, such as base memory address and interrupt assignment, are automatically controlled by software. It does not need any user interaction and pre-study for configuration. This removes the burden of searching for a conflict-free configuation, which can be very time consuming and difficult with some other bus standards.

Internal Programmable Timer/Counter
PCI-7248 has a programmable timer counter for generating periodic interrupts to the host processor. The timer/counter chipset is 82C54, which includes 3 16-bit counter,at 2MHz clock input. One counter is used as an event counter for counting events coming from input channel. The reminder two are cascaded together making a 32-bit timer, which can control the rate of interrupt generation.

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