basically, the theory is that the modem interprets something in a disconnect
series as a command and thus gets set off-hook, or hangs, or whatever. DUMB
mode makes it not understand any commands at all. For some reason setting
it to DUMB mode has fixed a lot of problems with the centry racks, including
th emodems not answering (AA off) after a disconnect, and the modem hanging
with only the MR light on, which needs a hard-reset to fix.
>>>4) What S= register will force the modem to reset on lowering of DTR? (the
>>>manual doesn't say)
>>
>>isn't that &d3? I couldn't get &d3 to work which is why I use &d2 and dumb
>>mode.
>
>It is; though we have seen odd results with &d3, wherein (I think) the reset
>causes the PM to think someone's on-line. This apparently lead to a cycling
>condition where the modems were regularly resetting.
well, I think what happens is the portmaster cycles DTR too soon or too late
which is what causes the cycling condition. I've asked hays for an S
register that sets the wait time for DTR cycle, to no avail. Thsi is why I
set it to &d2. But &d2 not resttting the modem after DTR really DOES drop,
this causes modem weirdness as described above (modem not going back to the
original settings after a user hangs up), which is where dumb mode comes in.
DUMB mode is documented on the century-2, but not the century16 (the original )
always sorry to start a thread :)
mickey
-- Mickey Panayiotakis -- Internet Interstate (301) 652-4468 mickey@intr.net