variable = BLen(channel, bufferType)
|variable||Variable to store results (No String or Single)|
|channel||RS-232 channel number (1 to 3)|
|bufferType||0=receive buffer, 1=send buffer|
BLen returns the current number of bytes in the specified RS-232 channel's buffer. If the buffer is empty, 0 will be returned. When receiving data, this function can be used to check how much data has been received before using
GetStr to read the data received.
If the receive buffer is full, it will not be able to receive any more data. To avoid this, use receive interrupts (see
On Recv) or increase the buffer size.
Dim A As Byte OpenCom 1,19200,0,100,50 On Recv DATARECV_RTN ' When data is received through ' RS232, jump to DATARECV_RTN Do Loop ' infinite loop DATARECV_RTN: If BLen(1,0) > 0 Then ' If there is at least 1 byte... A = Get(1) ' Read 1 Byte End If Return ' End Interrupt routine