malcolmnixon wrote:
> Greetings all,
>
> I'm not to familiar with Linux so this may be a dumb question.
>
> I'm trying to use the RTS line of /dev/ttts4, however that line (pin-7) has
> been re-purposed as the TX line of /dev/ttts5.
>
> The TS-7800 manual regarding UARTs states that:
>>> When some TS-UART ports are enabled, they override the
>>> meanings of other pins with their own meanings. When
>>> disabled, the pins revert to their original meaning.
>
> How would I go about permanently disabling /dev/ttts5?
At the lowest level, a TS-UART is enabled when its speed is set to a
non-zero baud rate. When the baud rate is 0 the port is disabled.
From the software perspective under Linux, the port is disabled when
the corresponding device node(s) are closed, and enabled when a
corresponding device node is open. (I put "(s)" because many TS-UARTs
have a separate device node for 9-bit mode.)
If you never open the device and never write a different value to the
STAT register of that port you are effectively keeping it disabled.
> Many thanks,
> - Malcolm
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