Dwyer DLI - Manual (Page 94)

94 | P a g e
ensure invalid data is not displayed. For this reason, the device must be re-registered if it is calibrated
or the measurement data is changed on another PC.
NOTE: that re-registering a device after a configuration change will not allow the PC to receive data from the
transmitter if there is already data from the device in the wireless graph. If no data has been received since the
software was launched, or the software is closed and launched again, the software will receive the transmissions as
expected. This behavior is caused by the fact the data that has already been received is only valid with the previous
image. Adding new data to the old dataset with different calibration constants or thermocouple type would result in
invalid data.
Wireless: Starting the Device and Synchronizing the Transmitter
Like other Dwyer data loggers, the RF series devices must be configured through a PC. The wireless
transmitter is primarily set up through the “Wireless Configuration” dialog discussed previously, but
synchronization of the transmitter to the desired starting time is accomplished through the “Start
Device” dialog when launching the data logger. When launching, choose the start time, and set the
logger parameters (device ID and reading rate) for the run. When the device is started, both the
logger and transmitter time base will be set for the selected start time. They will remain inactive until
the selected time, and then begin to operate as configured in the “Start Device” and “Wireless
Configuration” dialogs. When the delay-start time arrives, the logger will take readings (if enabled)
at the programmed reading rate, and wireless transmissions (if enabled) will be made at the reading
rate or custom interval, depending on how the device is configured.
If a delayed start is specified, the device will remain completely inactive during the start delay
period. The indicators will not blink, no readings will be taken and no transmissions will be sent. It
will continue to communicate normally, and may be queried, stopped, or restarted. If the application
only requires the wireless transmitter without data logging capability, the device may be stopped
immediately (when the “Transmit only while logging” option is not selected) after launching without
affecting the scheduled start of the wireless transmissions. This will marginally improve the battery
life when data logging capability is not required.
If immediate start is specified, the device will begin logging immediately, but it will inhibit
transmitter output for the first reading to comply with FCC regulations. To ensure the first
transmission is sent, use the delayed start mode with a 1-2 minute delay (minimum allowed by
software).
Once the device is started, the wireless transmissions can be viewed by performing the following
steps:
1. Connect the RFC101A wireless receiver to a COM port (see Connecting the RFC101A wireless
receiver of Wireless: System Components and Setup )
2. Go to the Communications -> Select COM Port menu and select the COM Port matching the
port that the RFC101A is attached to (usually COM1)
3. Go to the Communications -> Select Baud Rate menu and select 4,800 Baud
4. Go to the Communications menu and ensure that Accept Real Time Wireless Input has a check
mark next to it. If it does not, click on it and go back to the Communications menu to confirm it is
now checked.
5. Go to the Device Menu and choose "Display Real Time Wireless Data"
6. Wait for the first data point to be received.
7. For multiple data loggers, choose the "Composite Graph" tab to view all of the wireless data
sets in one graph. This helps the speed in refreshing the graph and is useful when comparing data
from multiple data loggers, and looking for data trends.
The LED’s on the RFC101A indicate power (green) and data (red). The Red LED light up briefly
every time a new data point is received. The Green LED should be on steady. If not, ensure that the
wall power adapter is plugged in properly.