Campbell CR800 Specifikace stáhnout pdf (Strana 276)

Section 12. Serial Input and Output Functions

12-6

instruction, 0 will be returned by the instruction. This instruction can be used

as the expression for the NumberBytes parameter in the SerialOutBlock

instruction.

ComPort The ComPort parameter specifies the communication port and mode

that will be used when receiving the binary data.

See the CRBasic Editor help for parameter details.

This instruction runs sequentially from the processing task sequencer,

regardless of whether the datalogger is in pipeline or sequential mode.

SerialOpen (ComPort, BaudRate, Format, TXDelay, BufferSize)

The SerialOpen instruction is used to set up one of the datalogger's ports for

communication with a non-PakBus device.

Syntax

SerialOpen ( ComPort, BaudRate, Format, TXDelay, BufferSize )

Remarks

When the SerialOpen instruction is executed, the serial port is "opened" and

subsequent textual messages will flow in and out of the port in between

PakBus packets. The data will be redirected away from the terminal mode

input based on subsequent SerialIn and SerialOut instructions.

See the CRBasic Editor help for parameter details.

Note: SerialFlush is used to clear the buffer.

For PakBus communication, BufferSize can normally be left at 0. However,

during communication with some devices it may be necessary to limit the

packet size (BufferSize) and add a delay (TXDelay) for communication to be

successful. For example, PakBus packets are 1000 bytes. The largest packet

that an RF95 can accommodate is 248 bytes. Setting the buffer to 240 would

limit the packet size and ensure that the RF95's buffer was not exceeded. A

delay (e.g., 500,000 ms) would ensure that each packet has sufficient time to

arrive at its destination before the next packet is transmitted.

This instruction runs sequentially from the processing task sequencer,

regardless of whether the datalogger is in pipeline or sequential mode.

SerialOut (ComPort, OutString, WaitString, NumberTries, TimeOut)

The SerialOut instruction is used to transmit a string over one of the

datalogger's communication ports.

Syntax

SerialOut ( ComPort, OutString, WaitString, NumberTries, TimeOut )

Remarks

If this instruction is set equal to a variable, the number of characters output is

returned. If a delay is needed before outputting the string, it should be entered

in the TXDelay parameter of the SerialOpen instruction. If the OutString and

WaitString variables are not formatted as a string, they will be converted to a

string by the datalogger.

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