Features:
- 24 Bits of Digital I/O
- 8 Outbit Bits, 8 Input Bits, Plus 8 Bits Selectable as Input or Output
- Outputs Switch 25mA up to 50V
- Inputs Monitor up to 32V
The Keithley PIO-HV 24-Bit, Open Collector, High Voltage Digital I/O board is a 24-bit parallel interface that allows the control and monitoring of digital signals with voltages greater than standard 5-volt logic levels. It supports up to 50V, allowing the user to connect their own arbitrary logic power supply, and it can drive very high currents. It also provides open-collector digital I/O. The board was designed to be used with IBM PC/XT/AT and compatible computers.
Most digital I/O boards are designed to interface directly with +5 volt logic signals (e.g., LSTTL or NMOS families). To interface a standard logic level board to higher voltages requires external signal conditioning, which is both expensive and bulky. Some digital output boards use electromechanical relays to expand their output capability. Though these relays work well in many applications, their low switching speed, high power consumption, and relatively short life make their use inadvisable in many applications. The PIO-HV with its high voltage input and output capabilities provides a compact, inexpensive alternative to external signal conditioning and relay solutions.
The PIO-HV’s 24 bits are divided into three 8-bit ports. Port A is an 8-bit output port, port B is an 8-bit input port, and port C is switch-selectable as input or output. This switch can be set through the PIO-HV rear panel, allowing Port C direction to be changed without opening the computer. The output ports are open collectors and will switch 25 milliamps at up to 50VDC. The input ports will monitor voltages up to 32VDC with a switching threshold of 3.2VDC.
All connections to the PIO-HV are made through a 37-pin D connector, which extends out the rear of the host computer. The user can wire directly to a mating 37-pin connector (part #SFC-37) or use a screw terminal board such as the STA-U or STC-37 to simplify field wiring.
The PIO-HV Keithley 24-Bit, Open Collector, High Voltage Digital I/O Board may still be available for purchase and support from Artisan Technology Group beyond End-Of-Life (EOL) by the manufacturer (OEM).
Artisan Scientific Corporation dba Artisan Technology Group is not affiliated with or a distributor for Keithley. The depiction, description, or sale of products featuring names, trademarks, brands, and logos is for identification and/or reference purposes only and does not indicate any affiliation with or authorization by any rights holder.