Addressing the modem via pyserial

[Doru-Catalin Togea]

Hi!

I asked previously how to address the COM port from Python and I was 
directed to pyserial. It is very elegant and I guess it works very well.

However, it seems that what I try to do is more complicated than I first 
thought. I want to make my modem place a call using the number '1234'. The 
modem is connected to COM3 on my computer. So I tried the following:

-------------------------------
import serial

ser = serial.Serial(2) # COM3
ser.timeout = 2  # otherwise the read(2) which follows blocks for ever
ser.write("atdt1234")
reply = ser.read(2)
print reply
ser.close()
print "ok"
-------------------------------

In the HyperTerminal which comes with Win XP Pro, I can set up a 
connection to COM3 and there type the 'atdt1234' command. It works (I get 
a call since I have the modem connected to a device with a phone on it).

My question is actually: will an at-command like 'atdt1234' translate to 
ser.write('atdt1234')?

Secondly, a modem question: I have found a lot of web pages about 
at-commands listing the hayes command set. Still many of them do not seem 
to work on two different modems I have tried. Like '&$' should display an 
overview of the commands supported by the modem. Ii tried this in the 
HyperTerminal where I can place the above mentioned call, and I get 
'ERROR'. I also get 'ERROR' for most other commands I try.

Any ideas?

Thanks,
Catalin

-- 

         <<<< ================================== >>>>
         <<     We are what we repeatedly do.      >>
         <<  Excellence, therefore, is not an act  >>
         <<             but a habit.               >>
         <<<< ================================== >>>>