On Jun 16, 2004, at 6:47 PM, Mark Wieder wrote:
DS> The rts=on and dtr=off are unusual.
DS> I suspect the weather station is using those to provide the voltages
DS> for its transmit line. Maybe it is using those for all power.
Or, as in x10, it is maybe using rts and dtr for a handshaking protocol.
I made an assumption.
This is the way I understand the handshaking settings (based on Windows mode info):
octs=on The computer looks at the CTS line (input) to control data output.
odsr=on The computer looks at the DSR line (input) to control output.
dtr=on/off The computer sets the DTR line (output) to the fixed value.
dtr=hs The computer flips the DTR line as needed to control data input.
rts=on/off/hs Like DTR
rts=tg Use for RS485 control; RTS is on only then transmitting
idsr=on Ignore input characters that come in while DSR (input=power on) is off.
I assumed the SerialControlString was the same way.
Note that on some of these "on" means handshaking and on some "on" means fixed on.
I assumed that (as in the Windows mode control) rts=on means on solid, but the coder of the serial routines might have assumed otherwise.
Even so, it is strange to _require_ that dtr=off.
Dar Scott
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