PIO-HV 24-Bit, Open Collector, High Voltage Digital I/O Board Functional Description Keithley’s PIO-HV is a 24-bit parallel interface that allows the control and monitoring of digital sig- nals with voltages greater than standard 5-volt logic levels. It supports up to 50V, allowing you to connect your 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 com- pact, inexpensive alternative to external signal conditioning and relay solutions. • 24 bits of digital I/O 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- • 8 output bits, 8 input bits, plus bit input port, and port C is switch-selectable as input or output. This switch can be set through the 8 bits selectable as input or PIO-HV rear panel, allowing Port C direction to be changed without opening the computer. The out- output put ports are open collectors and will switch 25 milliamps at up to 50VDC. The input ports will mon- itor voltages up to 32VDC with a switching threshold of 3.2VDC. • Outputs switch 25mA up to 50 volts 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 • Inputs monitor up to 32 volts screw terminal board such as the STA-U or STC- ® 37 to simplify field wiring. • 32-bit DriverLINX drivers plus a Specifications suite of bundled software Connector Pin Assignment ™ including ExceLINX , PORT A - OUTPUTS ™ ™ All digital I/O is through a standard 37-pin D- # OF BITS: 8. VisualSCOPE , TestPoint , and ™ CONFIGURATION: Open collector. type male connector that projects through the LabVIEW drivers MAXIMUM VOLTAGE: 50V. rear panel of the computer. For soldered con- OUTPUT CURRENT: 25mA at less than 1V. nections, a standard 37-pin D female (ITT/Cannon DC-37S or equivalent) is the cor- Ordering Information PORT B - INPUTS rect mating part, and can be ordered from # OF BITS: 8. PIO-HV 24-Bit, High-Voltage Keithley as part #SFC-37. CONFIGURATION: Common ground (single ended). Parallel Digital I/O INPUT IMPEDANCE: 1500Ω. Board with ASO-PIO INPUT HIGH LEVEL: Greater than 3.5V (at 1.5mA). Software CLAMP VOLTAGE 19 INPUT LOW LEVEL: Less than 2V or open circuit. 37 PA0 DIG COM 18 MAXIMUM INPUT: 32V. 36 PA1 DIG COM 17 35 PA2 DIG COM 16 34 PA3 DIG COM 15 PA PORT 33 PA4 APPLICATIONS PORT C - OUTPUTS DIG COM 14 32 PA5 DIG COM 13 # OF BITS: 8. 31 PA6 DIG COM 12 30 PA7 • Contact monitoring CONFIGURATION: Open collector. DIG COM 11 29 PC0 PB0 10 MAXIMUM VOLTAGE: 50V. 28 PC1 • Relay control PB0 9 27 PC2 OUTPUT CURRENT: 25mA at less than 1V. PB0 8 26 PC3 PB0 7 PC PORT • Parallel communications PB PORT 25 PC4 PB0 6 24 PC5 PB0 5 PORT C - INPUTS 23 PC6 • Process control PB0 4 22 PC7 # OF BITS: 8. PB0 3 21 DIG COM DIG COM 2 • Energy management CONFIGURATION: Common ground input. 20 DIG COM DIG COM 1 INPUT IMPEDANCE: 1500Ω. • Display drivers INPUT HIGH LEVEL: Greater than 4.0V (at 2.0mA). REAR VIEW INPUT LOW LEVEL: Less than 2V or Open Circuit. MAXIMUM INPUT: 32V. ACCESSORIES AVAILABLE Configuration C-1800 ENVIRONMENTAL PIO-HV STA-U C1800 PIO-HV to STA-U Cable Guide OPERATING TEMP: 0 to 50°C. C1800/M PIO-HV to STP-37/FC Cable STORAGE TEMP: –20 to 70°C. STA-U Universal Screw Terminal Accessory C-1800/M PIO-HV STP-37/FC HUMIDITY: 0 to 90% (non-condensing). STP-37/FC Screw Terminal Panel with female D37 connector EMC: Conforms to European Union Directive 89/336/EEC. STC-37 Direct Screw Terminal Connector WEIGHT: 4oz (120g). TESTPOINT TestPoint Software Package PIO-HV DIMENSIONS: 7.0in L × 4.25in H × 0.85in D (17.8cm × 10.8cm × 2.2cm). 1.888.KEITHLEY (U.S. only) www.keithley.com A G R E A TER M EASU R E OF C O N F I DENCE DATA A CQUISITION PRODUCT S For digital signals with greater than 5V logic levels STC-37