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SonTek/YSI Argonaut-XR Technical Manual - HydroScientific West

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Section 3. Direct Command Interface<br />

<strong>Argonaut</strong> Operation <strong>Manual</strong> Firmware Version 7.9 (May 1, 2001)<br />

<strong>SonTek</strong>/<strong>YSI</strong><br />

Before data collection, you must understand the basic communication protocol and set some<br />

operational parameters. This can be done using the direct command interface or the software<br />

provided with the <strong>Argonaut</strong>. This section describes the direct command interface using a terminal<br />

or terminal emulator (such as SonTerm or SonTermW supplied with the <strong>Argonaut</strong> software).<br />

• Section 3.1 describes communication protocols and settings.<br />

• Section 3.2 provides an overview of the operational modes of the <strong>Argonaut</strong>.<br />

• Section 3.3 gives an important notice about cycling the <strong>Argonaut</strong> power source.<br />

• Section 3.4 presents the syntax rules for the direct-command interface.<br />

• Section 3.5 gives a summary of all available commands.<br />

• Sections 3.6 through 3.15 describe each command in detail.<br />

• Sections 3.16 and 3.17 describe data output formats.<br />

• Appendix 2 provides support for <strong>Argonaut</strong>-SLs that have the vertical beam option.<br />

3.1. Serial Communication Protocols and Settings<br />

The <strong>Argonaut</strong> can communicate using several serial communication protocols (see §6.5 for<br />

additional information).<br />

• RS232 – Single system operation with cable lengths to 100 meters (300 feet)<br />

• RS422 – Single system operation with cable lengths to 1500 meters (4500 feet)<br />

• SDI-12 – Single system operation with cable lengths to 100 meters (300 feet)<br />

The protocol is set at the factory based on user requirements. The different protocols have the<br />

following effects on the direct-command interface.<br />

• RS232 – Direct-command interface is described here in Section 3.<br />

• RS422 – Direct-command interface is described here in Section 3.<br />

• SDI-12 – This protocol uses a reduced direct-command interface, which is typically used<br />

in conjunction with RS232 for complete programming capabilities. See Appendix 2 for<br />

details on SDI-12 operation.<br />

The default communication settings for all communication protocols are below.<br />

• 9600 baud (§5.4 explains how to change baud rate settings)<br />

• 8 data bits (fixed)<br />

• No parity (fixed)<br />

• 2 stop bits (fixed)<br />

3.2. Modes of Operation<br />

The <strong>Argonaut</strong> has five operational modes, each of which is described in this section:<br />

• Command mode<br />

• Data acquisition mode<br />

• Deployment mode<br />

• Sleep mode<br />

• SDI-12 interface mode<br />

7

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