Lenze Global Drive PLC Developer Studio Uživatelský manuál stáhnout pdf (Strana 22)

LenzeFpiDrv.lib function library

Functions

3.5 Receive data (L_Rs232ReceiveData)

3−7

LenzeFpiDrv.lib EN 1.1

3.5 Receive data (L_Rs232ReceiveData)

INT. L_Rs232ReceiveData (wDrvNr, pabyReceiveDataMemory, wBuffersize,

wTimeOut ,wNumberOfBytes,

byEndChar1, byEndChar2, wControl)

With this function data can be received via the FP interface.

· The operating system of the controller receives data and executes the PLC program at the

same time.

· A max. of 32767 characters can be received per function call.

· A new call is only possible after the previous call has been processed, i.e. after all data has

been received or the end of reception has been detected.

· An active receiving process can be cancelled by repeating the function L_Rs232Open . It is

then possible to receive data which has been changed, if necessary.

L_Rs232ReceiveData

wDrvNr

pabyReceiveDataMemory

wNumberOfReceiveBytes

wBufferSize

wTimeOut

byEndChar1

byEndChar2

wControl

Fig. 3−5 Receive data (L_Rs232ReceiveData)

Transfer parameters

Identifier Data type Possible settings Info

wDrvNr Word 30 AIF interface

pabyReceive

DataMemory

Pointer to Array

of Byte

Pointer set onto the address in

the memory where the storage

of the received data bytes is to

start.

The address of a variable (e. g. data array) can be detected using

the address function ADR .

wBuffersize Word 2 ... 32767 Size of the receive memory in bytes

· The memory has a minimum size of two bytes.

wNumberOf

ReceiveBytes

Word 1 ... 32767 Number of data bytes to be received

· This parameter can be used for checking the end of data

reception (see wControl).

wTimeOut Word 2 ... 60000 Time out time (in ms) for receiving data

· This parameter can be used for checking the end of data

reception (see wControl).

byEndChar1 Byte 0 ... 255 Character which defines the end of the data byte to be received.

· This parameter can be used for checking the end of data

reception (see wControl).

byEndChar2 Byte 0 ... 255 Character which defines the end of the data byte to be received.

· This parameter can be used for checking the end of data

reception (see wControl).

1 2 ... 17 18 19 20 21 22 23 24 25 26 27

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