Compactflash

Serial Port: Opto-isolated Matlabs type LTC485 Transmitter/Receiver. Compatible with RS-485 specification. Up to 32 drivers and receivers allowed on line. Pod I/O bus programmable from 00 to FF hex (0-255 decimal). Whatever address is assigned is stored in EEPROM and used as default at next Power-On. Input Common Mode Voltage: 300V minimum (opto-isolated). If opto-isolators are by-passed: -7V to +12V. Receiver Input Sensitivity: +200 mV, differential input. Receiver Input Impedance: 12 kilohm minimum Transmitter Output Drive Capability: 60 mA, 100 mA short-circuit current capability. Serial Data Rates: Programmable for 1200, 2400, 4800, 9600, 14400, 19200, and 28800 baud. Crystal oscillator provided.

Compliance

If the local power supply has an output voltage greater than 16VDC, you can install a zener diode in series with the supply voltage. The voltage rating of the zener diode (VZ) should be equal to VI - 16 where VI is the power supply voltage. The voltage rating of the zener diode should be VZ x 0.15 watts. Thus, for example, a 24 VDC power supply would require use of an 8.2V zener diode with a power rating of 8.2 x 0.15 equals approx. 1 watt.

Environment

Operating Temperature Range: 0° to 50°C (Optional -40° to +80°C.). See Temperature De-rating discussion on the REMOTE ACCES Overview page that presents "Specifications Common to all REMOTE ACCES Pods" for temperature de-rating based on power voltage applied. Storage Temperature Range: -50° to +120°C. Humidity: 5% to 95% non-condensing. Enclosure is designed to meet NEMA4 requirements. Size: NEMA4 enclosure 4.53" long by 3.54" wide by 2.17" high.(115mm x 899mm x 551mm)

I/O Chipset

Number: Up to 54 Sample Rate: Inputs can be scanned, under command, either sequentially or at random. Change of State Detection: Change-of-state flags can be set on any enabled input bits and can be read via the serial port. Logic Input Low: -0.5V to +0.8V. Logic Input High: +2.0V to +50.0V Low-level Input Current: 450 microampere maximum.

Power Consumption

Power for the opto-isolated section can be applied from the computer's +12 VDC power supply via the serial communication cable. Power for the rest of the pod can be supplied by a local power supply. Opto-Isolated Section: 7.5 to 25 VDC @ 40 mA. (Note: Due to the small amount of current required, voltage drop in the communication cable will be inconsequential.) Local Power: 7.5 to 16 VDC @ 100 mA typical. See box below. If the local power supply has an output voltage greater than 16VDC, you can install a zener diode in series with the supply voltage. The voltage rating of the zener diode (VZ) should be equal to VI - 16 where VI is the power supply voltage. The voltage rating of the zener diode should be VZ x 0.15 watts. Thus, for example, a 24 VDC power supply would require use of an 8.2V zener diode with a power rating of 8.2 x 0.15 equals approx. 1 watt.