Teledyne 4220 installation and operation guide Yco

4220 Flow Meter

Section 2 Programming

Table 2-1 ASCII Output Codes (Continued)

Code	Parameter		Units
YCO	YSI 600 Conductivity		Millisiemens per centimeter
YSP	YSI 600 Specific Conductance		Millisiemens per centimeter
YSA	YSI 600 Salinity		Parts per thousand
YTD	YSI 600 Total Dissolved Solids		Milligrams per liter
YTE	YSI 600Temperature		Degrees Celsius
YSP	YSI 600 Specific Conductance		Millisiemens per centimeter
YCO	YSI 600	Conductance	Millisiemens per centimeter
YSA	YSI 600	Total Salinity	Parts per thousand
YTD	YSI 600	Total Dissolved Solids	Milligrams per liter
YTE	YSI 600	Sonde Temperature	Degrees Celsius
SS	Sampler Enable Status		Logical
B?	Bottle Number and Time		Days
CS	Check sum (does not include		Unsigned long
	the check sum, carriage return,
	and line feed)

Note: The output string for a given flow meter will have values only for those parameters it is currently measuring. The order of the fields in this table is subject to change. Additional data types may be inserted anywhere in the list. Parsing routines for this output string should search by type identifier instead of depending on the position in the string. If an active port has an error flag set, the serial output will insert ERROR for the value.

You can enter the command line by connecting the interrogator cable with the interrogator sense line shorted to ground. Then send a series of ‘?’ (question marks) until the flow meter transmits the unit’s banner and prompt. The number of question marks necessary is a function of the baud rate auto detection. At the prompt, enter DATA<CR> and the flow meter will respond with the appropriate ASCII output string. You can send the DATA command as often as you want. Type ‘Q’ to leave the command response interface.

In addition to the port values, the data includes the flow meter’s current time, the bottle number and time stamp of the three most recent sample events, the previous day’s rainfall total (mid- night to midnight), the current day’s rainfall total since mid- night, and a rainfall tips counter that rolls over every 255 tips. (See Rain Gauge.) The port values appear in a comma-sepa- rated values format. Each data field is preceded by a two or three-character type identifier. The table lists the type identi- fiers. Note that the flow meter’s current time and the sample event time stamp appear as a number in standard spreadsheet format (days since 1900). The supported baud rates are 9600, 4800, 2400, and 1200 (no parity, eight bits and one stop bit).

Periodic Output: (Use a special RAIN GAUGE connector cable— contact the factory for assistance.) Note that the periodic output will terminate during phone connection and when the interro- gator cable is connected.

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