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Technical Description
The Dual SIO adapter utilizes the 16550 UART chip. This chip features
programmable baud rate, data format, interrupt control and has a 16 byte
transmit and receive FIFO.
Features
•
Fully independent operation of ports allowing two ports ports of
RS-422, Two ports of RS-485, or one port of each
•
Addressable as COM1: - COM4: or any other I/O address up to 3FF
Hex
•
"Shareable" IRQs allow more than one port to share a single IRQ
•
IRQ's 2/9, 3, 4, 5 supported
•
Support for non-standard baud rates available. These baud rates (such
as 31.25K or 76.8K baud) are supported by installing a different
oscillator. Please consult Sealevel Systems Technical Support for
more information.
•
Driver software included for Windows RS 485 operation
Line Termination
Typically, each end of the RS-422/485 bus must have line terminating
resistors. A 100 ohm resistor is across each RS-422/485 input and a 1K
ohm pull-up/pull-down combination bias the receiver inputs. If more than
two RS-485 nodes are configured in a multi-drop network, only the nodes
at each end of the bus should have the 100 ohm resistors installed.
Sealevel Systems Dual SIO
Technical Description
Page 6
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