SonTek/YSI Argonaut-XR Technical Manual - HydroScientific West

Argonaut Operation Manual Firmware Version 7.9 (May 1, 2001)
SonTek/YSI
The same communications cable is used for both
SDI-12 and RS-232 operations. A white, 2-pin
switch plug is used to change the hardware between
the two modes (Figure A2.1); a software
command also needs to be sent (see §A2.3).
When both ends of the plug are connected (the
plug is shorted), RS-232 communication is en- Figure A2.2. Switching hardware between
abled. When both ends of the plug are separated SDI-12 and RS-232 modes.
(the plug is open), SDI-12 communication mode
is enabled (Figure A2.2). Suggested connection sequence is as follows (Figure A2.3):
• Attach 8-pin underwater connector on the communications cable to the Argonaut.
• Connect serial DB-9 connector to a serial port on your computer.
• Connect SDI-12 pigtail to the data-logger.
Most data-loggers have +12V power output that can be used to power the Argonaut through the
SDI-12 cable (red lead) directly.
When using the supplied AC-to-DC power supply, or when operating the Argonaut with a power
source that exceeds 16 VDC, or when operating a data logger that does not provide power to external
sensors, the Argonaut can be powered using the coaxial power connector (up to 26 VDC).
A2.2.1. DC Power
The Argonaut requires 6-16 VDC input power (12.0 VDC recommended). Normally the Argonaut
is a low power device, however, when it transmits acoustic pulses it requires up to 200 mA
for short bursts. Make sure your wiring and battery are capable of supplying sufficient current.
Datalogger
Red- power (6 to 16 V)
White- data (SDI-12)
Black- ground
Serial connector DB-9
(to computer)
SDI-12 cable
Coaxial power connector (10 to 26 V)
(to optional external source)
Figure A2.3. Connecting an Argonaut-SL to a data-logger.
Argonaut
8-pin underwater
connector
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