Campbell CR6 Series, Руководство оператора

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Section 7. Installation
365
1. Open a serial port with SerialOpen() to configure it for communications.
o
Parameters are set according to the requirements of the
communication link and the serial device.
o Example:
SerialOpen (Com1,9600,0,0,10000)
o
Designate the correct port in CRBasic.
o Correctly wire the device to the CR6.
o Match the port baud rate to the baud rate of the device in CRBasic.
o Use a fixed baud rate (rather than auto baud) when possible.
2. Build the output string.
o
Example:
SerialOutString = "*" & "27.435" & "," & "56.789" & "#"
o Tip — concatenate (add) strings together using & instead of +.
o Tip — use CHR() instruction to insert ASCII / ANSI characters into
a string.
3. Output string via the serial port ( SerialOut() or SerialOutBlock() command).
o Example:
SerialOut (Com1,SerialOutString,"",0,100)
o
Declare the output string variable large enough to hold the entire
concatenation.
o Example:
Public SerialOutString As String * 100
•
SerialOut() and SerialOutBlock() output the same data, except that
SerialOutBlock() transmits null values while SerialOut() strings are
terminated by a null value.
7.7.18.5.4 Serial I/O Translating Bytes
One or more of three principle data formats may end up in the SerialInString()
variable (see examples in
Serial Input Programming Basics
(p. 363)
). Data may be
combinations or variations of these. The instrument manufacturer must provide
the rules for decoding the data
•
Alpha-numeric — Each digit represents an alpha-numeric value. For
ex ample, R = the letter R, and 2 = decimal 2. This is the easiest