Re: CF2.0 WM5 Comms help required please

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Let's see if we understand. What I get from your post is that

1. In the past you used an external GSM modem in the past that was external
and emulated a telephony model, plikely with an internal microcontroller.

2. Now you are not using that modem, but trying to use an internal GSM modem
of a new device to dial out.

3. The data logger is remote and has a modem that will answer a call.

If these are all true, then the case is still true that you cannot just open
the built-in GSM modem as a serial port and pass it AT commands - it just
doesn't work that way. You probably want the RAS APIs to get it to call
out, then you likely want to emulate something like a VT100.


--
Chris Tacke
OpenNETCF Consulting
Managed Code in the Embedded World
www.opennetcf.com
--



"Tym Huckin" <no_spam@xxxxxxxxx> wrote in message
news:457c4377$0$8754$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dick/Paul,

I've used GSM modems quite successfully before on my laptop.

Here in the UK, a GSM sim card can have 3 "lines" on it - voice, fax and
data, each with a specific number.

The device I have used is here:
http://www.cubeblue.co.uk/gsmmodem.htm

In this case it was attached to the serial port of my laptop, with a GSM
sim card in it. Selecting COM1 from my software, it correctly dialled, and
connected to the datalogger.

The old win3.11 TERMINAL.EXE program was used to test it extensively
independent of my own software.

What I am wanting to do is use the SPV M5000 as a combined platform AND
modem and repeat the exercise, as I said, the problem is selecting the
correct COM port! (and getting to grips with serial coms in vb.net!)

I'll clarify beyond doubt - this is NOT a "network" connection of any
description!!!! This is a serial connection - not internet connection -
but physically dialling in to a data logger which has a 2400baud (!) modem
in it as it's only source of connection. Consequently I *have* to use the
serial port object or I won't be able to connect.

Tym




"Dick Grier" <dick_grierNOSPAM@.msn.com> wrote in message
news:eMZeaCwGHHA.3268@xxxxxxxxxxxxxxxxxxxxxxx
Hi Tym,

Paul's comment about GSM is correct. If you are trying to use a GSM
modem for its common usage (a network connection), then you would not use
the SerialPort object. Network connections use completely different
APIs.




.

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