Campbell Scientific SAT ARGOS Argos Transmitter - Manual (Page 8)

SAT ARGOS
2
1.1 Physical
The SAT 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 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. The SDC protocol allows other SDC devices to be connected to the
same serial port. Power is supplied via the SC12 cable, pin 1 and pin 8.
Not all CR10X wiring panels supply 12 volts to pin 8. The
CR10X wiring panel must include the text: “ CR10X wiring
panel” .
The RF connector is an SMA female; nominal output impedance is 50 ohms.
Transmit power is typically one watt. The antenna is omnidirectional, which is
necessary because the target satellites are not geostationary.
The SAT ARGOS SDC port pin out:
Pin number Function
1 +5 volts
2 Ground
3 NC
4 TXD (data out)
5 NC
6 SDE (input)
7 CLK/HS (input)
8 +12 volts
9 RXD (data in)
NOTE