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Changing a radio channel on your wireless node and wireless base station is accomplished through Node Commander software.  Follow the four step process outlined below to update your radio channel (frequency) setting.  Note that radio channels on both your wireless node and wireless base station must match to establish network communication.

To change node/base station radio channel:

1. Right-click Base Station/Node.
2. Click Configure. 
3. Click Frequency.
4. Click Channel, e.g. 24 (2.470 GHz).

The internal power switch allows the wireless node to use external power from batteries or other sources. Here is a link to a detailed technical note: http://files.microstrain.com/8401-0004-Using-External-Power-With-Wireless-Sensor-Nodes.pdf

All software provided by MicroStrain saves data files in CSV (comma separated value) format.  The CSV file is readily importable into any third party analysis program.

The wireless nodes all have 2 Mbytes of datalogging memory.  This 2 Mbytes is organized into 8,191 ‘pages’ of memory, each page holds 132 data points.  The maximum number of data points that can be held in memory can be calculated as follows: 8,191 pages x 132 data points/page = 1,081,212 total data points.

Now the question arises, ‘how long can a node datalog before its memory is full?’. The answer is that it varies depending on how many channels are being sampled and what sampling rate has been set. Here are two examples:

Let’s set a V-Link-LXRS so that channel 1 is active with a datalogging sampling rate of 2048 samples per second and we launch continuous datalogging.  Our calculation would be:

• 1 channel x 2,048 samples per second = 2,048 data points per second
• 1,081,212 data points / 2,048 data points per second = 527 seconds
• 527 seconds / 60 seconds per minute = ~9 minutes to fill the memory

Let’s set a G-Link-LXRS so that channels 1, 2 and 3 are active with a datalogging sampling rate of 32 samples per second and we launch continuous datalogging.  Our calculation would be:

• 3 channels x 32 samples per second = 96 data points per second
• 1,081,212 data points / 96 data points per second = 11,262 seconds
• 11,262 seconds / 60 seconds per minute = ~187 minutes to fill the memory

The gateways (base stations and WSDA-1000) and the wireless nodes employ radios with these general specifications (see the individual product data sheet for any variations):

In FINITE sampling, the user sets a total number of samples to be taken which equates to a time period.  Because the sampling rate per second is known, the user can adjust the number of samples to be taken to determine how long the sampling period will be.

In CONTINUOUS sampling, the user does not set the total number of samples and therefore does not set the time of the sampling period.  By selecting CONTINUOUS sampling, the user is instructing the system to sample data until the user manually stops the sampling (via software), the power is cycled, the on-board datalogging memory is full, the battery dies, the power fails, etc.