Laird DVK-WLM400, Manual

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WISM+ DVK MANUAL
Version 1.00 Page 9
©
Laird Technology 2010
3 Using AT Commands with PC Serial Port
A PC serial port can be used to execute a set of simple AT commands using HyperTerminal. The following section
shows you how to set up a HyperTerminal session to communicate with the WISM+ using its host COM port.
Refer to the “AT Command Reference” for descriptions of the AT command set.
The WISM+ module (WLM400/402) implements a serial port at 3.3V levels. The WISM+ Dev Kit has industry standard
RS-232 level translators and provides a male DB-9 connector so you can connect to a PC serial port using the female-
female serial cable provided with the Dev Kit. The WISM+ dev kit is viewed as a DCE (Data Communications
Equipment). If you use a standard serial cable (male to female), you will need a gender changer (not a Null-Modem
adapter) at the WISM+ Dev Kit end.
If your PC does not have a serial port, you’ll need a USB to Serial converter. Most USB to Serial converters will
require a driver to be loaded. You must first follow the instructions which came with your USB to Serial converter and
install the driver as they recommend.
Once your serial port is in place and you know the COM port number (COM6, COM1 etc.) you can perform the
following steps to set up HyperTerminal to communicate from your PC to the WISM+ Dev Kit hardware over the serial
port…
•
Launch HyperTerminal by clicking…
•
Start Button

All Programs

Accessories

Communications

HperTerminal and you will see the following…
We have entered a name
for this HyperTerminal
Session (“WISM+ 38400”).
Select the “Telephone” icon and in the
“Name” field,
Click “OK” and you will see the following screen…
Select the COM port
connected your to the
WISM+ and you will
you will see this
Click “OK” and the following
COM port properties screen will
appear…