User`s manual

Software Installation
Intellio C218Turbo User's Manual 3-25
Feature
In “Port Feature Settings” sub-dialog, port feature [Terminal] is the only choice
if On Board Line Discipline is set to “Enable”. This is good for terminal
application users.
However, if On Board Line Discipline is set to “Disable”, port feature could be
either [Transparent] or [Terminal]. In case of [Terminal], all the tty line
discipline jobs will be done on host which surely is a burden to the host. In case
of [Transparent], no time-consuming tty line discipline is applied for the port
except flow control, thus non-terminal applications such as data acquisition will
benefit from it, e.g. gain better throughput and performance. The firmware on
board will do Xon/Xoff flow control and H/W flow control if ixon/ixany or ixoff
are set via ioctl() system call. In this case, the Non-Modem and Modem Baud
Rate do not apply.
Response
Three levels, Slow, Normal and Fast, of port response time are designed for
user's need. Ports with faster response time will consume more host CPU's
resource while slower response consumes less resource. The response time for
those ports with normal or slow response can be further tuned by the response
level in “Performance Tuning” menu. In addition, if the port feature is set to On-
board Line Discipline “Disable” and Feature “Terminal”, response option will be
locked at “Slow” level.
UART FIFO
You can set this feature to “Enable” (default) and gain most performance for the
board. Or you can set this feature to “Disable” to avoid from data loss when
communicating with plain communication devices using S/W flow control.
RTS/CTS Hardware Flow Control
This feature is for more flexible driver behavior. If set to “Disable” (default),
CTS signal is not needed for tty port to transfer data and RTS/CTS hardware
flow control function in driver is disabled. On the contrary, if set to “Enable”,
CTS signal is needed for tty port to transfer data and RTS/CTS hardware flow
control function in driver is enabled.