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Full Discussion: Serial Lines Explained
Top Forums UNIX for Dummies Questions & Answers Serial Lines Explained Post 302912179 by edfair on Wednesday 6th of August 2014 11:32:31 AM
Old 08-06-2014
Since most serial communications is via a UART this might help with the data transfer part:
Universal asynchronous receiver/transmitter - Wikipedia, the free encyclopedia

The UART voltage swings are between 0 and 5 volts. This signal is inverted and expanded to higher voltages by line drivers for transmission and inverted again and reduced to 0/5 swings by line receivers on the receiving end.

The transmitted signal starts degrading immediately and at higher transmission speeds it can be expected to be useless beyond 50 feet due to RC effects. (with a scope you would see rounding of what started as sharp shapes of voltage transitions)
 

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iscc(7) 						 Miscellaneous Information Manual						   iscc(7)

NAME
iscc - serial communications interface SYNOPSIS
controller iscc0 at isa0 DESCRIPTION
An onboard Zilog 8530 DUART provides AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications ports. Both serial communications ports can operate at baud rates from B50 to B38400, excluding B134 (see tty(7)). On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01) is available for use by application programs as an additional communications port. In the absence of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity. Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs. RESTRICTIONS
Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured as the serial system console. The iscc terminal driver enforces this restriction. No modem control is supported for either the CON or AUX serial communications ports. FILES
console terminal local terminal local terminal RELATED INFORMATION
console(7), devio(7), tty(7), MAKEDEV(8) delim off iscc(7)
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