JB> I am trying to understand how to correctly place the different

 JB> parameters that make up an initialisation string for a modem. 



In general,  AT&F (reset to factory defaults) goes first.  Most

modems aren't too fussed about parameter order - but later parameters

may affect earlier ones.  A simple example for you:  AT&FS37=5  tells

my modem to reset itself to factory defaults - including 'connect at

full speed' (14.4k) - then tells it to connect at 1200 baud.



 JB> I have read the manual that can with the modem I have borrowed, and

 JB> whilst it tells me waht each parameter means/what it does, I have no

 JB> idea if it is necessary to ensure certain ones go first. 



See above.  AT&F gives you a definite starting point to 'tweak' from.



 JB> As far as trying to work out an init string for this modem (Dataplex

 JB> 225 V.34) is it just a matter of putting in those parameters that it

 JB> does not default to?   I find the whole thing confusing!!



Dataplex 225's are made in Australia.  You should be able to run it

with just  AT&F.   If you like to get some feedback on its workings 

as well, try AT&F&C1&D2X3.

Translation:

AT&F = reset to factory defaults (your manual should describe these).

&C1  = set 'received signal detect' to follow the *other* modem's signals,

       so if the *other* modem quits, your modem will know about it.

&D2  = tells modem to 'hang up' if *your* computer stops sending its

       'ready' signal to the COM port for some reason (eg: you quit the

       comm program while still on-line)

X3   = ignore the 'dial tone' (on phone line), report a CONNECT {speed}

       message when connecting, or a BUSY message if 'engaged tone' is

       detected.





NB: a lot of phone lines don't support high speed modeming.  Mine barely

manages 14.4k.  Telecom only guarantees 2400 baud on residential lines!



 JB> I'm starting to think it's one of the black arts!!



Hmmm, we were discussing voodoo as a solution to phone line problems 

a few weeks back.... :)



good luck,   Fraser

--- Blue Wave/Max v2.12 [NR]