Campbell-scientific CR3000 Micrologger Manual de usuario descargar pdf (Pagina 210)

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Section 7. Installation

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• BaudRrate — Baud rate mismatch is frequently a problem when developing

a new application. Check for matching baud rates. Some developers prefer to

use a fixed baud rate during initial development. When set to -nnnn (where

nnnn is the baud rate) or 0, auto baud-rate detect is enabled. Autobaud is

useful when using the CS I/O and RS-232 ports since it allows ports to be

simultaneously used for sensor and PC telecommunications.

• 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 used before SerialOpen() can be used again to reconfigure

the same serial port, or before the port can be used to communicate with a PC.

7.8.8.5.1 Input Instruction Set Basics

SerialOpen()

• Be aware of buffer size (ring memory)

• Closes PPP (if active)

• Returns TRUE or FALSE when set equal to a Boolean variable

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()

• 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 record + one byte)

SerialInBlock()

• For binary data (perhaps integers, floats, data with NULL characters).

• Destination can be of any type.

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