The PC104P-SIO4B is a four channel full-duplex serial board that is available with RS-422/485 transceivers. Each channel can operate up to 10 Mbits/sec in synchronous mode and 1 Mbit/sec in asynchronous mode. Up to 32 Kbytes of FIFO buffering for both transmit and receive (256 Kbytes Total FIFOs) data on each channel provides for a smooth and efficient interface between the serial interfaces and the PCI host computer.
The board is based on the Zilog© Z16C30© high speed Integrated Universal Serial Controller (USC) which supports Asynchronous, Isochronous, Bisync, Monosync, HDLC/SDLC and Nine-Bit protocols. The USC chip provides full duplex operation with baud rate generators, digital phase-locked loop for clock recovery and a full duplex DMA interface.