Dwyer DLI - Manual (Page 95)

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Wireless: Using Multiple Devices
When using more than one RF transmitter, should transmissions overlap, it is certain that one or both
of the transmissions will be lost. There are several methods, described below in order of complexity
(least to most), to circumvent this issue:
1. Use Delay Start to Stagger the Reading / Transmit intervals – By choosing a reading rate (see
below Table:Prime numbers from 3 to 2160 and Table:Prime number examples, or above
Staggering transmissions from multiple devices under Custom Transmit Interval ) and delay
between start times on multiple loggers, you can ensure that the computer never receives more than
one wireless signal in a 30 second window.
2. Rely on the logged data - The RF transmitters can be configured to log all data to non-volatile
memory. If a data point is lost, it may be fully recovered by a later offload.
3. Provide a direct connection - If it is possible to have a PC always connected to the RF series
logger (while monitoring via RF elsewhere), then using the serial output transmitter mode or the real-
time chart recording feature of the software will avoid RF interference.
4. Randomize the transmission interval – This option is selected from the wireless configuration
menu. Selecting this option will cause the transmitter to wait a short random delay of up to 5 seconds
before it transmits each data packet. Should two transmitters drift to within 5 seconds of each other,
this feature will reduce the dropped points by about 80% until the transmitter clocks drift apart again.
This will also decrease the chances of sequential lost packets.