Campbell Scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interface User Manual
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AL200 ALERT2 Encoder, Modulator, and Sensor Interface
•
Set the
Slot Length – This is the maximum amount of time within the
frame that the station can report during. It is an integer value between
500 and a maximum of the
Frame Length.
•
Set the
Slot Offset – This is the amount of time into the frame that the
slot will occupy. For example, if your frame is 120,000 ms (2
minutes) and your slot offset is 60,000 ms, the slot time will begin 1
minute after the beginning of the frame.
•
Set the
Hop Limit – (None) – This is the maximum number of times a
remote transmission can be retransmitted by repeaters.
•
Set the
Path Service Enabled – (No) – When enabled each device
that repeats a remote transmission will add its source address to the
packet. This makes it possible to trace the path that a packet took
from its beginning to its destination.
Radio Settings
The default radio settings have been chosen to work well with Campbell
Scientific’s RF320 series (Ritron DTX-L series) radios. If using a different
type of radio, consult the manufacturer and apply the changes to the following
settings.
•
Set the
Radio Power Up Mode – (On Only With Data to TX) – This
determines when the radio will be powered on.
•
Set the
Radio Warm Up – (750) – This is the amount of time, in
milliseconds, that power will be applied to the external radio prior to
data transmission.
•
Set the
Carrier Only Time – (10) – This is the amount of time, in
milliseconds, that radio will be fed an unmodulated carrier.
•
Set the
AGC Time – (25) – This is the amount of time, in
milliseconds, that the radio will be fed a tone-modulated carrier.
•
Set the
Tail Time – (5) – This is the amount of time, in milliseconds,
an unmodulated carrier will be transmitted following data
transmission.
•
Set the
Modulation Voltage – (390) – This is the peak-to-peak
voltage level of the modulated signal that will be fed to the radio.
Value is expressed in millivolts.
•
Set the
Modulation Polarity – (Normal) – This is the polarity of the
modulated signal fed to the radio.
GPS Settings
•
Last GPS Fix – This is the data and time of the last successful GPS
fix obtained by the AL200.
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