SAT SCD/ARGOS INSTRUCTION MANUAL REVISION: 1/03 COPYRIGHT (c) 2000-2003 CAMPBELL SCIENTIFIC, INC.
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Warranty and Assistance The SAT SCD/ARGOS is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
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SAT SCD/ARGOS Table of Contents 1. Overview......................................................................1 1.1 Physical.....................................................................................................2 1.2 Electrical ...................................................................................................2 2. Programming the Datalogger.....................................3 2.1 Data Packets.................................................................................
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SAT SCD/ARGOS 1. Overview The SAT SCD/ARGOS certified PTT satellite transmitter is well suited for remote data collection applications. Service Argos data transceivers fly aboard two or more of NASA’s polar orbiting environmental satellites (POES). The SCD center carrier frequency is 401.620 MHz, the Argos center carrier frequency is 401.650 MHz. Channel spacing is 500 Hz. With an orbit altitude close to 800 kilometers, the satellites are at a relatively low orbit.
SAT SCD/ARGOS 1.1 Physical The SAT SCD/ARGOS PTT is housed in an aluminum enclosure measuring 3” x 2.75” x 1”. There are two electrical connections. The DB9 port connects to the datalogger CS I/O port. The SMA female port connects to the 50 ohm impedance antenna. 1.2 Electrical The SAT SCD/ARGOS PTT uses the Campbell Scientific Synchronous Device for Communication (SDC) protocol. The SDC port (DB9 connector) connects directly to the datalogger serial port (CS I/O), using the supplied SC12 ribbon cable.
SAT SCD/ARGOS BATT INT ON OFF EXT CHG CHG +12 +12 G 12V Logan, Utah SW 12V CTRL SE DIFF 7 8 9 4 G G H 10 5 L AG H 11 12 6 L AG E3 AG G G L AG H SW 12V 5V 5V G G 12V POWER IN CS I/O G CR10X WIRING PANEL MADE IN USA SE DIFF 1 2 3 4 5 2 1 G G H L AG H 6 SDM 3 L AG H L AG E1 AG E2 G P1 G P2 G C8 C7 C6 C5 C4 C3 C2 C1 G 12V 12V EARTH GROUND WIRING PANEL NO. FIGURE 1-2. SAT SCD/ARGOS with Enclosure 2. Programming the Datalogger 2.
SAT SCD/ARGOS When sending one data packet of 16 data points, the PTT will repeat the data packet at the repeat interval. When sending two data packets of 16 data points 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.
SAT SCD/ARGOS 2.3.4 Using Result Codes in the Program After P125 has executed, check the result codes. If the result code is greater than or equal to two, execute P125 again. Recheck the result code on the next pass of the program table. Example Algorithm: If time to write data Write data to Final Storage Execute P125 Use P89 to determine if result code >= 2 If true execute P125 end (P95) 2.3.5 When to Execute P125 Usually P125 is only executed after data has been written to final storage.
SAT SCD/ARGOS ; Load more values in input locations 2: Bulk Load (P65) 1: 99 F 2: 101 F 3: 102 F 4: 103 F 5: 104 F 6: 105 F 7: 106 F 8: 107 F 9: 11 Loc [ Start_9 ] ; If top of the hour, write 16 data point to FS1 3: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 4: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 5: Sample (P70) 1: 13 Reps 2: 3 Loc [ Start_1 ] ; If top of the hour, transfer all new data to the SAT SCD
SAT SCD/ARGOS 3. SAT SCD/ARGOS Configuration The SAT SCD/ARGOS PTT must be configured before you deploy it. Two numbers are used to track your data through the system. The first number is your Program ID, the second number is your SCD/Argos ID. The PTT can use up to 4 SCD numbers and up to 4 ARGOS ID numbers. You must have your SCD/Argos ID numbers before you can configure your PTT. The SCD/Argos ID number and transmission repetition rate is written to the SAT SCD/ARGOS PTT during configuration. 3.
SAT SCD/ARGOS The shut down timer will turn the PTT off after the shut down time has expired. The PTT will not turn back on. Set the shut down timer to zero for extended operation. Save the configuration file to a new name. From the PTTComm menu bar, select File, Save As and save the file to a new name. You may need the original configuration file at a later date. 3.2.1 Loading the Configuration to the PTT Assemble the hardware.
SAT SCD/ARGOS over the poles 14 times a day providing 28 satellite passes per day. Coverage decreases with latitude. At the equator the PTT will “see” a satellite six or seven times a day. The SCD2 satellites are in a different orbit pattern than the POES satellites. The duration of the POES satellite visibility depends on the angle from the PTT to the satellite. If the satellite passes directly overhead, the satellite will be visible for about 15 minutes.
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