Our COMH 131 ISA RS-422/485 serial communications board utilizes the 16550
UART--the same UART found in the IBM® asynchronous serial adapter. This means
that writing to one of our adapters is virtually the same as writing to the IBM
serial port. The output of each port may be set to half-duplex transmissions for
RS-485 operation, or to full-duplex transmission for RS-422 operation. RS-485
two- or four-wire operation is supported. Address locations are switch
selectable and interrupt request lines are set via on-board jumper blocks. Our
COMH 131-E upgrade to the 16850 UART, with a 128-byte buffer.
The cards provide up to 500VDC of ground isolation. Full support for Windows
95/98/2000/ME/NT is provided, though simplier applications may require no
additional drivers at all.
Our free Developer's Toolkit™, featuring drivers, samples, applications, and
programming information collected over the years, is included. Our goal is to
provide the developer with a single high-level programming interface that will
function with a wide variety of CyberResearch products across today's mainstream
operating systems, including DOS and Windows® 95/98/2000/ME/NT.