Xylem System 5000 User Manual - Manual (Page 62)

GOES Random Options
Defines the Random transmission
channel number. The range is 1 to 199
and represents a specific frequency
for communicating with the satellite.
The channel number will be assigned
by NOAA.
OUTPUTS
60
Channel Number
Defines the baud rate for the random
transmissions and is assigned by
NOAA. Keep in mind this baud rate
may be different than the Self-Timed
transmission baud rate.
Baud Rate
Defines the window length used by the radio within which to generate a random time to transmit
the data. When data is placed in the random transmit buffer of the radio, that data will be
transmitted at some random time in the Transmit Window. For example, if a Transmit Window of
5 minutes is set (00:05:00), when data is sent to the random buffer, the transmission is randomly
scheduled at some time within the next 5 minutes. Be aware that if new information is added
to the Random window, it will overwrite any previous entries and may re-schedule the random
transmission. A smaller window than the Scan Rate will allow all Random transmissions to be
successfully sent and not overwritten or replaced.
Transmit Window
This option displays the conditional statement used to determine if a random transmission should
be sent. This statement is normally a logical expression that evaluates to being true or false. For
example, “Analog1 > 4.5” would equate to true if the value for a Task named Analog1 measures
a value greater than 4.5 and would equate to false if it was less than or equal to 4.5. Logical
expressions return a value of 1 if true and 0 if false. If the conditional statement is true, a random
transmission will be scheduled.
The Transmit Condition will also evaluate as true for any value that is greater than 0.0 and false
for any value that is 0.0 or less. This allows for standard math expressions to also be used for the
Transmit Condition. For example, if a temperature probe was connected to an analog channel
that read in degrees F and was assigned to a Task named Probe, a math equation like “(Probe -32)
* -1” could be used to trigger a transmission any time the temperature was below 32 degrees F.
If the temperature is at or above freezing, the results of the equation would be zero or negative
and would be considered false, otherwise it would be positive and true.
Transmit Condition