1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400. More detailed
information on the AT+IPR command can be found in the Huawei AT Command manual.
This manual is available at www.zoomtel.com/4575support
.
To send the command you may need to download a terminal program for Windows. If
you do not have a terminal program on your PC, there are several open source programs
such as Tera Term, Putty, or RealTerm that you can download and use if you obey their
terms of use. Remember that after you send the AT+IPR command to change the serial
port speed, you will need to change the serial port speed of your terminal program to
continue to talk to the modem.
Many applications will access the modem by directly talking to the com port where the
modem is installed. However, if you are using Windows dial-up networking and the
ZoomCell modem, you will need to download an INF file for dial-up networking to talk to
the modem. If you need an INF file to make dial-up networking work, you can download
one from www.zoomtel.com/4575support
.
Using the USB port with Windows based machines
To use the modem’s USB port for Windows computers, you must first install the USB
driver
Installing the USB Driver
1 Download the Windows USB driver for your modem from
www.zoomtel.com/4575support
. Unzip the file and store it in a folder on your
desktop.
2 Inside that folder, double click on DriverInstall.exe to install the USB driver. The
driver installs in the background in roughly 30 seconds. If the This program
might not have installed correctly dialog box appears, you can ignore this
message and click This program installed correctly.
3 Plug one end of the USB cable into the USB port of your computer and plug the
other end of the cable into your modem’s USB port.
Using the USB Ports
When the modem installs the driver, you may notice that 6 virtual USB ports are now
installed on your computer. Selecting which port you should use depends on your
application. In Chapter 1, we gave the example of using Dial-up networking to connect
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