Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 207

Section 7. Installation • Does the record have a delimiter character, e.g. ",", spaces, or tabs? These delimiters are useful for parsing the record into usable numbers. • Will the sensor be sending multiple data strings? Multiple strings usually require filtering before parsing. • How fast will data be sent to the CR1000? • Is power consumption critical? • Does the sensor compute a checksum? Which type? A checksum is useful to test for data corruption. 2. Open a serial port (SerialOpen() instruction). • Example: SerialOpen(Com1,9600,0,0,10000) • Designate the correct port in CRBasic. • Correctly wire the device to the CR1000. • Match the port's baud rate to the baud rate of the device in CRBasic. o Use a fixed baud rate (rather than autobaud) when possible. 3. Receive serial data as a string (CRBasic SerialIn() or SerialInRecord() command). • Example: SerialInRecord(Com2,SerialInString,42,0,35,"",01) • Declare the string variable large enough to accept the string. o Example: Public SerialInString As String * 25 • Observe the input string in the input string variable in software numeric monitor. Note SerialIn() and SerialInRecord() receive the same data. SerialInRecord() is generally used for data streaming into the CR1000, while SerialIn() is used for data that is received in discrete blocks. 4. Parse (split up) the serial string (CRBasic SplitStr() command). • Separates string into numeric and / or string variables. • Example: SplitStr(InStringSplit,SerialInString,"",2,0) • Declare an array to accept the parsed data. o Example: Public InStringSplit(2) As String o Example: Public SplitResult(2) As Float 207