2
OVERVIEW
Most new PDAs, and some newer laptops, do not come with a standard serial
port, but do come with a built-in Bluetooth device. One of the features
available through Bluetooth is a virtual serial connection. This makes it
easy to make wireless connections to data loggers, as you only need to
purchase an adapter for the data logger side. Even if your particular PDA or
laptop does not have built-in Bluetooth, it can be easily added through USB
"Dongles" like the Belkin
®
Bluetooth USB adapter, or one of the many other
vendors that are available.
The advantages of using a Bluetooth serial connection include:
o
Wireless connection, no need to be directly at the data logger
o
Security, a pin code can be used to prevent unauthorized access
o
Ease of setup, Bluetooth serial ports are easy to setup and use.
The only disadvantage to using the Bluetooth serial device is the high
current required to run it, around 41mA average, at +5 volts. At sites where
AC power is available, this is not a big concern, but for sites where a
battery and solar panel are used, this should be taken into account when
performing the power budget.
One option for saving power would be to power down the Bluetooth CSA when
not in use and to only power it when communications are needed. This is done
by physically removing the device or removing the AC adapter.
