IDO-xx

IDO-xx Series cards provide 16, 32, or 48 opto-isolated differential outputs and plug into expansion slots of IBM PC/XT/AT or compatible computers. Solid-state, P-Channel FET switches are used as the output elements and provide both greater reliability and much faster turn-on and turn-off time than is possible with electromechanical relays. User-supplied load voltages can be from 5V to 60V. Output connections are via 50-wire ribbon cables that mate with headers on the card. A strain relief bar where the cables exit the card assures that the cables will not interfere with adjacent cards. Standard cables are six feet long but alternate lengths are available. Model STA-50 Screw Terminal Accessory cards, one per each 16 bits, can be used to provide easy connection to your system.

The card uses six bytes of I/O Bus address; one byte for each eight bits of output. Outputs of a programmable array logic chip enable data bytes to be clocked into latches. Outputs of the latches, in turn, are connected via opto-couplers to the output P-channel FET drivers. The opto-couplers used are rated to at least 2000 V_RMS and on-card isolation channel-to-channel and channel-to-computer exceeds 500 V_RMS in optimal test environments (* see note). The P-Channel FET drivers are capable of 1 Ampere steady-state current, 2A pulse (Note: Current output may be limited by the cable to as little as 0.5A). Diodes are included across the load for inductive-spike protection.

*Note on Isolation: The Opto-isolators used are rated to at least 2000 V_RMS. On-card isolation channel-to-channel and channel-to-ground is governed by factors such as cabling, spacing of pins, spacing between traces on the PCB, humidity, dust, and other environmental factors. This is a safety issue so a careful approach is required. For CE certification, isolation was specified at 60 VDC. The design intention was to eliminate the influence of common mode. Tolerance of higher isolation voltage can be obtained on request by applying a conformal coating to the board.

There are 48-bit, 32-bit, and 16-bit versions. The latter two models are de-populated versions of the 48-bit card.

Each bit of the IDO card is optically-isolated from the output driver which switches the supply voltage to the output pin. The negative connection is made on the return pin and each output is isolated from every other output.

When the opto-isolator is ON, the FET is activated by the Zener-diode-limited supply voltage. When the FET is ON, the full Supply voltage is available at the output pin. When the opto-isolator is deactivated, the FET opens and the output drops to the return line voltage level.

Note, because high voltages can be present, a protective cover is included and cables plugged into the headers on the card extend through this cover and exit the card through a cutout in the mounting bracket. (A strain-relief bar is also provided at that exit point.) If there is the possibility that some other card in your system will have sharp trimmed component leads that could pierce the cable(s), then you can use shielded "Zippertubing" (our part number ZTR-xx) to protect the cable and prevent possible short circuits.

Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers

A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Specifications

Digital Outputs

• Number of Channels: 16, 32, or 48
• Output Voltage Range: 5V to 60V (Voltage supplied by User)
• Load Current per Channel: 1 Ampere max. steady state, 2A pulse
  (Note: Current may be limited by the cable. Certain ribbon cables limit current to 0.5 A.)
• Isolation: Optically isolated channel to channel and channel to ground (* see note)
  Opto-isolater: P/N ILQ2 exceeds 2000 V_RMS
• Switching Time:
  Turn-On: 50 µsec
  Turn-Off: 2 µsec, inductive-spike protection via a diode
• Switch Resistance: 0.4 ohms when saturated
• Switch Leakage Current: 1 uA

  *Note on Isolation: The Opto-isolators used are rated to at least 2000 V_RMS. On-card isolation channel-to-channel and channel-to-ground is governed by factors such as cabling, spacing of pins, spacing between traces on the PCB, humidity, dust, and other environmental factors. This is a safety issue so a careful approach is required. For CE certification, isolation was specified at 60 VDC. The design intention was to eliminate the influence of common mode. Tolerance of higher isolation voltage can be obtained on request by applying a conformal coating to the board.

Environmental

• Operating Temperature: 0°C to +60°C
• Storage Temperature: -20°C to +100°C
• Humidity: 5% to 95% non condensing
• Size: 13.310 inches. Install in a full-size slot.

Power Requirements

• +5 VDC at 540 mA typical for fully populated 48 bit card

Regulatory Compliance

• This product is in full compliance with CE requirements