Xylem XL Series H-522 - Plus - Manual (Page 181)

XL™ Series
Operation with the GOES Radio 16-25
PC Interface View Built In Display Screen
R - Transmit Rate RR Rate [HH:M M :SS]
This option allows the user to set a window length used by the radio 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 time window set by the “RR Rate” option. For example,
let's assume a random rate of 30 minutes. When data is sent to the random buffer, the
transmission is randomly scheduled at some time within the next 30 minutes.
PC Interface View Built In Display Screen
B - Random BaudRate RR Baud Rate [100]
This option is used to set the baud rate for the random transmissions. At this time the only baud
rate used by NOAA is 100 baud. If NOAA ever uses higher baud rates in the future then this
option will allow the user to change it as needed. Keep in mind this baud rate may be different
than the Self-Timed transmission baud rate.
PC Interface View Built In Display Screen
A - Alarm Condition Tx Fnt[xxxxxxxxxxxxxx]
This screen displays the conditional statement used to see if a random transmission should be
sent. This statement is normally a logical expression that evaluates to being true or false . For
example, “ana1 > 10.0" would equate to true if the value for analog channel 1 is greater than 10.0
and would equate to false if it was less than 10.0. Logical expressions return a value of 1.0 if true
and 0.0 if false. If the conditional statement is true then a random transmission will be scheduled.
The transmit trigger condition is actually true for any value that is greater than 0.0 and is false for
any value that is 0.0 or less. This allows for standard math expressions also to be used for the
transmit trigger condition. For example, if a temperature probe was connected to analog channel
1 that read in degrees F, a math equation like “(ana1 - 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 (32 degrees) the results of the equation would be zero or negative and would be
considered false, otherwise it would be positive and would be true.
The conditional statement can be up to 48 characters and can be based on multiple conditions as
shown in the next two examples; “(ana1>10.0) & (counts > 0.05)”. In this example the value for
analog channel 1 must be greater than 10.0 AND the counts input (normally rain fall) must be