Campbell Scientific ST-21 Argos Satellite Transmitter - Manual (Page 9)

ST-21 Argos Satellite Transmitter
taken to avoid transmitting too often. The programmed repetition period must
match the System Use Agreement between the user and Service Argos.
1.5 One Argos ID Number
The ArgosDataRepeat() function is most useful when only one Argos ID
number is used. It does not matter how many data buffers use the same ID.
ArgosDataRepeat() allows the selection of which data buffers will be
transmitted, and at what repetition period. When ArgosDataRepeat() is used to
start data transmission, the ST-21 will wait one repetition period between each
transmission. One buffer is transmitted each transmission, regardless of how
many buffers have been enabled. The maximum number of transmissions that
can be scheduled with ArgosDataRepeat() is 255.
2. Datalogger Programming
There are 5 programming instructions available for use with the ST-21 Argos
PTT: ArgosSetup, ArgosData, ArgosDataRepeat, ArgosTransmit, and
ArgosError. The use of ArgosSetup is optional. ArgosData and
ArgosDataRepeat are used to enable transmission of data. More advanced
applications can use ArgosTransmit. If the setup parameters of the PTT need
to be changed, use ArgosSetup first. The setups are maintained in memory
until the PTT resets. Once the setup parameters are set, use ArgosData
followed by ArgosAutoRepeat. Data in a buffer is saved until the PTT resets
or is overwritten by another occurrence of ArgosData. If either the
ArgosDataRepeat or ArgosTransmit instruction tries to use a data buffer that
has not been setup, the instruction will fail.
2.1 Argos Setup
ArgosSetup (Result Code, Buffer Number, Decimal ID, Hexadecimal ID,
Frequency)
2.1.1 Result Code
Result Code used to determine if command executed successfully. The Result
Code is set true on success, and false on failure.
2.1.2 Buffer Number
Buffer Number is the ST-21 buffer to setup. Valid entries are 0 through 6.
2.1.3 Decimal ID Number
The Decimal ID number, and Hexadecimal ID are assigned to the Buffer
Number. Entries must be valid ID numbers or ArgosSetup will return False.
The decimal ID is not a different representation of the same number as the
Hexadecimal ID. The two ID numbers are different.
2.1.4 Frequency
Frequency to be assigned to the Buffer Number. Frequency is in Hertz. Valid
entries: 401630000 to 401656000 in steps of 2000 Hz and 401676000,
401678000, and 401680000 Hz.
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