Theodore Ts'o writes:
> If that's not possible, can someone enumerate all of the different
> half-duplex can be done? Simply having all of this information in one
> place would be really helpful, both as documentation and so we can
> actually put together that list of #define's.
Ok, at work, we use a lot of multi-drop RS485, and it requires that RTS
is set TRUE during transmission. In this mode, we have a "master" device
and several "slave" devices which get polled regularly.
The timing between RTS becoming TRUE and sending the first byte is "as
small as possible", typically less than one character time. The important
bit here is that RTS is TRUE and the driver is active immediately before
the start bit of the first character is transmitted.
The timing between the last character being sent and RTS becoming FALSE is
also "as small as possible", ie less than one character time.
In both cases, we're talking about the order of ms at 38400 baud.
Oh, we also use RS422, but this is already covered by the existing serial
driver. ;)
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