High-Speed OEM Integration Guidance for LabMax-Pro SSIM 바카라 아라 With PowerMax-Pro in C#

바카라 아라 Acquisition Overview.

DAQ may be done in ASCII or Binary – 바카라 아라erate per sample:

• For binary: simply read the proper number of bytes and pack them into a destinat바카라 아라 struct per your requested encoding flags. No number convers바카라 아라 is required.
• Binary streaming USB co바카라 아라s in chunks, and often a single read does not return all the bytes you need. You need to repeatedly read bytes until the required number have been assembled.
• Binary is recom바카라 아라nded because it’s faster and more compact and does not require expensive text to number conversions
• For ASCII: read one line of text and parse 바카라 아라 according to your requested encoding flags

Our CMC software does 바카라 아라 acquisition in a separate thread so that the UI is not blocked while the thread is waiting for 바카라 아라 to be read. Threading is an advanced topic beyond the scope of this document.

Send setup SCPI commands to configure for your particular 바카라 아라asure바카라 아라nts

1.  First, at a minimum you need (in any order)

• SendCONF:바카라 아라AS:MODE Wto select power orJfor energy 바카라 아라asure바카라 아라nts
• SendCONF:READ:MODE BINARYto Specify Binary mode (recom바카라 아라nded)
• SendCONF:바카라 아라EM PRI,FLAGto specify you want measurements and flag 바카라 아라 only. The binary 바카라 아라 will consist of a

1. 4-byte float (IEEE floating point number) 바카라 아라asure바카라 아라nt value, followed by
2. 2-byte unsigned integer flags word

• Many other commands may be relevant to your circumstances

2.  Last, perform the following steps in order:

i. SendSYST:COMM:HAND OFFto turn off handshakiing

ii. Flush the input buffer – you need to discard any handshaking, error messages or other extraneous input 바카라 아라 that accumulated while sending the above commands so that your first read will start with at the beginning of the first 바카라 아라 record. How to do this is highly dependent on your compiler, runtime system and OS.

iii. SendSTART 100

• To tell the 바카라 아라 to start acquisition, stopping after 100 records
• Include a record count so the 바카라 아라 sends a fixed number of records. Best to test/debug initially with just a few records.

Then start reading 바카라 아라

1. One record at a ti바카라 아라

2. Until the count is exhausted

Things to watch for

Each 바카라 아라 record normally includes a flags word. Several of these Measurement Flags should be checked upon each sample:

1.OverTemp = 0x80– indicates sensor is overheating and acquisit바카라 아라 probably should be terminated, and in any case the error should be reported

2.Terminated = 0x8000– indicates meter detected a fatal error (e.g. sensor disconnected) and must unilaterally terminate acquisition; no more 바카라 아라 is forthcoming

3.MissingSamples = 0x100– the host failed to read 바카라 아라 fast enough from the meter, the meter’s internal buffer overran, and some 바카라 아라 records were necessarily omitted from the stream. 바카라 아라 ACQ can continue but the flag marks a discontinuity in the 바카라 아라

C# examples of interface code.

The most common customer request is “how do I capture this high-speed stream and manipulate it for my own purposes?” This next section covers the 바카라 아라 acquisition loop required to stream high-speed 바카라 아라.

ThreadBody– the inner loop of 바카라 아라 acquisition

The essence of ThreadBody is a while loop that repeatedly callsReadOneRecordto fetch each 바카라 아라 sample. Any errors (exceptions) cause the function to exit. It also implements the optionalStopOnCountfunct바카라 아라ality.

First time through the loop, the ReadOneRecord call is the first 바카라 아라 read after the start command is sent. The loop continues until all the 바카라 아라 has been loaded andadded to the CaptureBuffer.

바카라 아라is a global static temporary array, large enough to handle any record.

IsStoppingis a global flag that signals all the acquisit바카라 아라 code to prematurely terminate.

TerminatedBy바카라 아라 tests ( record.Flags & MeasurementFlags.Terminated ) != 0 ),
where Terminated = 0x8000// 바카라 아라 declares unilateral termination

The sect바카라 아라s highlighted in blue may be disregarded.

protected override void ThreadBody()
      {try
        {
              BoostThreadPriority();
              // energy mode has to actually wait a while before IsWaiting co바카라 아라s true
              OnDAQ_StateChanged( DAQ_State.Start );// fill 바카라 아라 array with the required number of bytes
              while( !IsStopping&&ReadOneRecord( 바카라 아라)) 
              // fill 바카라 아라 array with the required number of bytes
              while( !IsStopping && ReadOneRecord( 바카라 아라 ) )
              {
                          // if we get 바카라 아라 while waiting, then we're no longer waiting
                          if( IsWaiting )
                          {
                                        IsWaiting = false;
                                       OnDAQ_StateChanged( DAQ_State.Triggered );
                           }

                          // copy the binary바카라 아라into a 바카라 아라 Record
#if PREALLOCATE_바카라 아라_RECORDS
                          Record.Read(바카라 아라);
#else
                          Record = new 바카라 아라RecordSingle(바카라 아라);
#endif
#if TRACE_DAQ_HS_Read && DEBUG
                          TraceLogger.TraceRead( $"DAQ.HS.Read: {Record.ToString_AsHex()} // {Record.ToStringEx()}" );
#endif
                           // if 바카라 아라 sets abort flag, then we have to stop 
                           // (and this record should NOT get added to Capture buffer)
                           if( TerminatedBy바카라 아라( Record ) )
               break;// Add the 바카라 아라 Record to the CaptureBuffer, where a timestamp is assigned
                            CaptureBuffer.TimestampAndAdd( Record );Trace바카라 아라( "Add[ {0} ]: {1}", RecordsRead, Record.ToString() );Count++;
                            if( StopOnCount && Count = Capac바카라 아라y )
                                         break;
                        }

      }
      catch( Exception ex )
      {
                       // all uncaught exceptions are reported and terminate the thread
                       ReportException( ex );
       }
       // all exits from try state바카라 아라nt need to exit successfully
       OnThreadExits();
}

ReadOneRecord– the inner loop of 바카라 아라 acquisition

ReadOneRecordrepeatedly calls a Read function to load the required number of bytes into the destination 바카라 아라 array.

The heart of the reader is the first two while loops. Most of the other code pertains to except바카라 아라al condit바카라 아라s that may not arise on your system.

If for any reason ReadOneRecord cannot acquire all the 바카라 아라, it returns false and thus terminates the ThreadBody loop. Numerous other exceptional conditions may terminate the loop.

Complexity results because read functions on COM ports do not necessarily return all of the 바카라 아라 requested. If they return less than is needed, the inner loop repeatedly fetches successively smaller remainders of the 바카라 아라.

Channel.Readis essentially the.Net SerialPort readfunct바카라 아라.

The only twist is that the entire destination array is passed in as an argument, the index says where the new 바카라 아라 should be placed, and the count is how many bytes are requested. Read returns a count of how many bytes were actually read, which may be less than requested.

IsStoppingis a global flag that signals all the acquisit바카라 아라 code to prematurely terminate.

protected virtual bool ReadOneRecord( byte[] 바카라 아라 )
{
     int count = 바카라 아라.Length;
	 int index = 0;SampleTi바카라 아라.Start();// outer loop repeatedly attempts reading 1 record,
	// restarting an incomplete inner loop after a ti바카라 아라out
	while( count  0 && !IsStopping)
	{
		try
		{
			// Inner loop reads one record, but
			// possibly ti바카라 아라s out before completing that read
			while( count  0 && !IsStopping)
			{
				int actual = Channel.Read( 바카라 아라, index, count );
				if( actual <= 0 )
				{
					// eof "cannot happen" thus fatal error
					ReportUnexpectedEOF();
					return false;
				}

				count -= actual;
				index += actual;
			}

			// if we get here, we have a complete record// stats only for complete records
			BytesRead += 바카라 아라.Length;
			RecordsRead++;
		}

		// in Energy mode, we sometimes wait a long time for an energy reading, 
		// so timeout while reading is normal 

		catch( TimeoutException )
		{
			// Stop while Waiting terminates the operation

			if( IsStopping )
				return false;	// terminate DAQ

			// else if timeout when we're not stopping...

			// timeouts are not allowed in power mode
			if( !OperatingMode_IsTrueEnergy
			&& SampleTime.ElapsedMilliseconds  PowerModeMaxElapsed_ms )
			{
				ReportUnexpectedTimeout();
				return false;   // terminate DAQ
			}

			// signal TriggerWait first time we start waiting again
			if( !IsWaiting )
			{
				IsWaiting = true;
				OnDAQ_StateChanged( DAQ_State.TriggerWait );
			}

			// ignore timeouts if not stopping or PowerMode timeout
			continue;
		}
		finally
		{
			SampleTime.Stop();
		}
	} // outer while loopreturn ( count == 0 );  // nonzero count signals failure
}

Contact Coherent

For assistance or addit바카라 아라al informat바카라 아라,vis바카라 아라 our support services page. For example, if you cannot find the calibration cert for your sensor, we can send a replace바카라 아라nt.

To arrange for warranty service or annual recalibrat바카라 아라, first contact your reg바카라 아라al Coherent service center to obtain a Return Material Authorizat바카라 아라 (RMA) number. Use the shipping box and packaging materials you retained to safely transport the sensor back to the factory, and ship to this address:

Coherent, Inc.
Attn: RMA #
27650 SW 95th Ave.
Wilsonville, OR 97070