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Simplified Interface - DENT Instruments

Simplified Interface - DENT Instruments

4. Some commands result

4. Some commands result in the logger giving a line feed and carriage return followed by what the command asks for. Some commands only give a carriage return (without a line feed) followed by what the command asks for. In the description of the commands the words “line feed” appear after commands where a line feed is returned by the logger and “no line feed” where there is none. 5. Important Communication Protocols: Set the remote host to communicate at 57600 baud (or whatever baud rate the logger is set to), 8 data bits, Parity = None, 1 stop bit, Flow control = None. An Example Routine Data Collection Set of Commands In its simplest form, data retrieval consists of sending a SELECT command to tell the logger what date range of data is desired followed by an EXPORT command that begins the data transmission. Typical Data Collection Session Commands—Computer calls the logger First Call to Logger: PC Commands Function Wakes the logger, Returns a prompt (>) ID Returns the logger serial number HEADINGS Returns the time stamp and data column headings SELECT /* Tells the logger to choose all data in the logger for downloading EXPORT Tells the logger to begin downloading the data Second and Subsequent Calls to the Logger: PC Commands Function Wakes the logger, Returns a prompt (>) SELECT /* mm/dd/yy hh:mm Tells the logger to choose all data from mm/dd/yy hh:mm to the last data record for downloading. Where mm/dd/yy hh:mm should be the record following the last record from the previous download. EXPORT Tells the logger to begin downloading the data An additional, optional command would be C! [date time] to update the logger clock to the PC’s clock. It may also be desired to use the $? Command prior to HEADINGS to turn off the character echo from the logger. That will prevent the command names from being added into the downloaded data file. If the logger originates the call the last command issued to the logger should be S! (see below). 2

1. DESCRIPTION OF COMMANDS FOR DATA RETRIEVAL ID Returns logger serial number. The serial number may or may not be retrieved with each data download session. It is often used to identify an existing data file to which new data will be appended or to label a new data file. Example: command >ID (no line feed) returns 8032F > HEADINGS Returns the text column headings for the data and time-stamp fields. The column headings consist of two rows. The first line returned is the top row and the second line is the bottom row. The headings are in quotes and comma delimited. The first three column headings will always be: Record Record Record (followed next by the data column names) Number Date End Time The column headings are usually retrieved once from the logger at the first data download. Subsequent data retrievals are usually appended to an existing file and the column headings need not be reretrieved. Example: command >HEADINGS (no line feed) returns "Record","Record","Record","Chan 1","Chan 2","Chan 2" "Number","Date","End Time","Avg. Temp","(C)Units","(R)Units" (carriage return and line feed) > SELECT /* Sets the logger to output ALL data in the logger starting from the first record through the last. Data output occurs when the logger receives an EXPORT command. (See below.) There must be a space between SELECT and the /* Example: command >SELECT /* (line feed) returns > SELECT /* mm/dd/yy hh:mm Sets the logger to output all data in the logger starting with the date and time listed in mm/dd/yy hh:mm (inclusive) to the end of the data in the logger. Must be used with an EXPORT command. There must be a space between SELECT and the /* and the date and time argument. 3

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