Campbell CR3000 Micrologger, Руководство оператора

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Section 7. Installation
309
•
Format — Determines data type and if PakBus
®
communications can
occur on the COM port. If the port is expected to read sensor data and
support normal PakBus
®
telemetry operations, use an auto-baud rate
argument (0 or -nnnn) and ensure this option supports PakBus
®
in the
specific application.
•
BufferSize — The buffer holds received data until it is removed.
SerialIn(), SerialInRecord(), and SerialInBlock() instructions are used
to read data from the buffer to variables. Once data are in variables,
string manipulation instructions are used to format and parse the data.
SerialClose() must be executed before SerialOpen() can be used again to
reconfigure the same serial port, or before the port can be used to communicate
with a PC.
7.7.18.5.1 Serial I/O Programming Basics
SerialOpen()
1
•
Closes PPP (if active)
•
Returns TRUE or FALSE when set equal to a Boolean variable
•
Be aware of buffer size (ring memory)
SerialClose()
•
Examples of when to close
o
Reopen PPP
o
Finished setting new settings in a Hayes modem
o Finished dialing a modem
•
Returns TRUE or FALSE when set equal to a Boolean variable
SerialFlush()
•
Puts the read and write pointers back to the beginning
•
Returns TRUE or FALSE when set equal to a Boolean variable
SerialIn()
1
•
Can wait on the string until it comes in
•
Timeout is renewed after each character is received
•
SerialInRecord() tends to obsolete SerialIn().
•
Buffer-size margin (one extra one byte)