SonTek/YSI Argonaut-XR Technical Manual - HydroScientific West

5.4. Communication Baud Rate Setting
Argonaut Operation Manual Firmware Version 7.9 (May 1, 2001)
SonTek/YSI
The Argonaut communication baud rate, normally 9600 baud, is set at the factory and should not
normally need to be changed. However, for some specialized applications, you may wish to set a
different baud rate. This is done by a special command from the direct-command interface. The
command format is shown below. See Section 3 for details about the direct-command interface.
UserDefaultBaudRate Set [baud rate]
• Default parameter: 9600
• Parameter range: 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200
• Without parameter: returns its current setting.
• If given with a valid parameter in the form shown above, sets the baud rate to this value.
• If the command is recognized as valid, the system will transmit an “OK ”
followed by the command prompt “>” at the old baud rate setting. All further communication
is done using the new baud rate. The setting is used until a new value is set.
• Note that the command Defaults (§3.7) does not reset the communication baud rate.
SonTek software operates assuming a baud rate setting of 9600. If another baud rate setting is
used, you will need to specify this in the software program. See the Argonaut Software Manual
for details on specifying the communication baud rate.
5.5. Cables and Connectors
5.5.1. Power/Communication Cable and Bulkhead Connector
All Argonaut systems use the same bulkhead connector for external power and communication.
This is an 8-pin underwater mateable connector manufactured by Impulse Enterprises. The
bulkhead connector part number (for information only) is BH-8-FS; the cable connector part
number is IL-8-MP (with locking sleeve). The address for Impulse Enterprises is:
Impulse Enterprises Phone: (619) 565-7050
8254 Ronson Road Fax: (619) 565-1649
San Diego, CA 92111 USA
The following table shows the pin out for the Argonaut bulkhead connector. The wire colors
shown are for the standard SonTek power and communication cable. Data transfer is listed
relative to the Argonaut: Data Out / Tx refers to data being sent by the Argonaut; Data In / Rx
refers to commands being received by the Argonaut. Wiring for both RS232 and RS422 serial
communication is shown. See §6.5 for information about serial communication protocol.
Note that there are two different input power pins. Pin 1 is the external power input. The voltage
from this pin passes through an additional voltage regulator inside the Argonaut. This pin can
accept input voltages from 12-24 V DC; the additional internal regulator supplies no more than
12 V DC to the Argonaut processor. System power consumption using the external power pin is
notably higher than when using the battery power pin.
The second input power pin (pin 5) is called the battery power input. The voltage from this pin
goes directly to the Argonaut processor and must be in the range 7-15 VDC. Higher voltage will
damage the Argonaut electronics. This pin is used for autonomous deployments from battery
power because of the reduced power consumption when bypassing the additional voltage
regulator. See §6.1 and §7.2 for details about input power options and power consumption.
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