METER EM50 Series - 6.6 DataStation Networks

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EM50R RADIO TELEMETRY
Transmit Only: This is the original Transmit radio mode. It does not offer the advantages of
the Confirmed Delivery Transmit mode. You should use the Confirmed Delivery mode when
possible. Em5R (discontinued) loggers only support this Transmit radio mode.
Transmit + two-way and CD Transmit + two-way: These modes combine the two-way Radio
mode and the Transmit Radio mode. You could use these modes while configuring and testing
your radio network. You should not leave your radio logger in these modes because they use
the most battery power of all the radio modes. Using Transmit + two-way and CD Transmit
+ two-way radio modes with the wake interval set to 1 or 2 causes your logger batteries to
drain very rapidly.
6.1.2 TRANSMIT BEST PRACTICES
Transmit modes are most useful when you have three or more loggers installed within radio
range of each other. There is no set limit to the number of radio loggers broadcasting to a
DataStation. Use this mode for as few as one logger and as many as 50 or more loggers.
You should use the Telemetry Test feature of ECH20 Utility to test the connection from your
logger to the DataStation.
NOTE: Em50R loggers must have firmware version 1.12 or later to enable the Confirmed Delivery Transmit mode
and Telemetry Test feature. Your DataStation must have firmware version 1.09 or later to receive Confirmed Delivery
Transmit mode data packets. Contact METER for an application note that covers the steps needed to upgrade
yourhardware.
NOTE: See section on DataStation Networks for step by step instructions for configuring your DataStation and remote
radio loggers.
6.2 TWOWAY RADIO TELEMETRY
The two-way Telemetry Mode lets you establish a two-way connection with a remote
radio logger. Once connected to the remote logger, you can download data and change
most settings just like you were connected directly to the logger with a serial cable.
Communicating with a remote radio logger requires you to have a Rm-1 radio modem
connected to your computer. Connect to the remote radio logger through the Rm-1.
When a logger is in a two-way Radio Mode, it turns on its radio every 45 s. While the radio is
on, the logger listens for connection attempts from a Rm-1. If the logger does not hear any
connection attempts, it turns off the radio. If the logger hears a connection attempt, it leaves
the radio on for several seconds listening for login commands from ECH20 Utility. It takes up
to 60 s to connect to the remote logger.
When you are finished interacting with the remote radio logger, you press the disconnect
button. ECH20 Utility sends a logout command to the remote logger to indicate the end of
the communication session. When the remote logger hears the logout command, it waits
for 10 min before listening for additional connection attempts via the radio (you can always
direct connect to your logger). This allows you to connect to other loggers with the same
radio settings. Otherwise, the first logger you contacted may reconnect. This would prevent
you from connecting to your other loggers.