Portwell PCI-ICM485-4 Serial Communication Port Card, provide effective asynchronous serial communications in RS422 and RS485 networks on long communications lines in noisy environments.
Portwell PCI-IDI-48A PCI Digital I/O Card This series of cards provide as many as 48 optically-isolated inputs for AC/DC signals with Change-of-State (COS) Detection capability. Each input is reverse polarity protected and rectified by photo-coupler diodes. Standard 12/24 AC control transformer outputs can be accepted as well as DC voltages. The input range is up to 60VDC or AC Rms at frequencies of 40 to 10kHz. Each input circuit contains a switchable filter that has a 4.7 millisecond time constant (without filtering, the response is less than 30 microseconds). The filter must be selected for AC inputs in order to eliminate the on/off response to AC. The filter is also valuabl e for use with slow DC input signals in a noisy environment. The filter may be switched out for DC inputs in order to obtain faster response. Filters are individually selected by jumpers. See Figures 1-1 and 3-1 for jumper arrangements.