Campbell SAT ARGOS, Инструкция по эксплуатации

Страница: 10 / 16

SAT ARGOS
4
each, total of 32 data points, the PTT will alternate between each data packet.
If you send four data packets, the PTT will send packet one, wait the repeat
interval, send packet two, wait the repeat interval, send packet three, wait the
repeat interval, send packet four, wait the repeat interval, and start over with
packet one.
2.3 Datalogger Instruction 125
The datalogger uses P125 to send data to the PTT. All new data, up to 64 data
points, in the active storage area is sent to the PTT. New data is all data that
has been written to the active final storage area since P125 last executed. If
there are more data than 64 data points (4 data packets times 16 data points),
P125 does not send the extra data. The extra data will be sent the next time
P125 is executed. You must not continuously write more data to the active
final storage area than you can send over Argos. The datalogger does not erase
data after it has been sent to the transmitter.
2.3.1 The Active Storage Area
The datalogger has two final storage areas, final storage area 1 (FS1) and final
storage area 2 (FS2). Program instruction 80 is used to set the active storage
area. By controlling where data is written and what storage area is active when
P125 executes, you can keep two separate data files. This can be useful if you
want to collect and store more data than you can send over Argos. FS1 is the
default storage area. The datalogger always defaults to FS1 at the top of the
program table. If you plan to use FS2, you must allocate memory to FS2.
Memory for FS2 can be allocated in Edlog; click on “ Options/Final Storage
Area 2” .
2.3.2 New Data
The datalogger must keep track of what data has been sent to the PTT and what
data has not. To track new data, the datalogger keeps several data storage
pointers. The Data Storage Pointer (DSP) points to the first location past the
last data value in final storage. The Satellite Pointer points to the first data
location that was written since P125 last executed. When P125 executes
successfully, all new data is transferred and the satellite pointer is updated and
points to the DSP, or 1 data location past the last data value sent to the PTT.
2.3.3 P125 Result Codes
Program instruction 125 returns a result code to the input location specified in
P125. The result code can be used to determine if P125 executed successfully.
Under certain circumstances the datalogger cannot properly execute P125; for
example, the PTT blocks communications while transmitting. Result codes
can be used to determine if you need to execute P125 again. See Table 2-1 for
result codes.