Iii. power considerations – Xylem Global Access Radio Modem Software User Manual
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higher. Older versions of Global Logger II do not support a “Fixed Baud Rate” mode
which is required for radio communication. All loggers on this radio network must be
programmed in fixed baud rate mode at 38,400 baud. Loggers programmed this
way will work with both the Global Access and Global Logger II version 2.1.1 or
higher with no incompatibility. There are two considerations:
The first consideration is that when connecting the logger directly to a PC using any
version of the Global Logger II software, you must select the
38,400 option from the baud rate pull down menu in the main
connection screen or a communication error will occur.
The second is that if you connect to an older version of
Global Logger II than 2.1.1 and reprogram any settings,
the logger will be reprogrammed into “Auto Baud Rate” mode,
which is normal to most of Global Water’s logger devices. This will
cause communication failure when using the Global
Access software. Should this happen, use a version
of Global Logger II with a version of 2.1.1 or higher
and reprogram the logger for fixed baud rate mode
at 38,400. This is done in the Setup menu under the
general settings section. Just select 38,400 and
reprogram the logger. No other settings will be affected
but the logger will no longer be able to communicate at any other speed.
III. Power Considerations
In remote monitoring systems, power consumption is a critical design factor so it is
important to know how that power is being used.
It is assumed that since a server radio must be connected to a computer, the power
consumption is not generally a problem. However; each client radio will draw 40mA
all the time and almost ½ amp when it is transmitting. The amount of time spent
transmitting is comparatively small but any power system must be able to
permanently maintain the standby current, as well as having the capacity to supply ½
amp for short times. If power is lost, no communication is possible until it is restored.