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I will start reading up on the Timer Control. Thanks to those who actually contributed rather than just using up bandwidth. Mike

>Um, it's the looping code we need to see really OKkkkky; how about the part of the code that says: 'Wait until sample interval has passed before takeing the next sample (Tek-tip folks: this is where the majority of time is wasted burning up 50% CPU time for 1 hour when SampleInterval = 60...

Here is the code for the serial port polling/communications that only occurs once per hour. I deleted as much non-essential, repeated steps as possible to shorten up the routine. Please feel free to suggest improvements, like with serial communications handshaking. Thanks to all who responded...

Can VB6 poll the serial port say every hour without sucking up 40 to 50% of the CPU time looping continuously waiting for a 60 minute timer interval to occur? For example, is there a way for a VB6 routine to run in "sleep mode" more efficiently until it is time to do a short data transfer via...