"Theodore Y. Ts'o" <[EMAIL PROTECTED]> moved upon the face of the 'Net and spake thusly:
> Most all text terminals uses DTR flow control and if one connects a
> terminal to a PC with a standard null-modem cable, the cabling supports
> DTR/DSR flow control.
>
> I've seen this assertion made often, but I've never seen any evidence to
> back it up. All of the terminals with which I'm familiar do RTS/CTS
> flow control, not DTR/DSR flow control. Apparently historical Unix
> systems didn't find these terminals common either, or it's likely that
> historical Unix systems (including AT&T SVR4) would have supported
> DTR/DSR flow control either, and they didn't.
>
I've used both terminals and printers that only do (hardware) flow
control on DTR. This pain is most easily solved by connecting the
device's DTR through to the host's CTS, rather than bothering with DTR
flow-control.
Since some UART chips don't even implement DSR (eg. some of the ones
used in Stallion products), this cabling trick is sometimes the only
way to use these DTR-flow devices.
cjb.
--
Christopher J Biggs \ [EMAIL PROTECTED] \ Vice-Pope torture and marketing
Stallion Technologies\ Brisbane, Australia \ Holy Church of Givashitology
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