Sensors, Electronics and Prototyping

Reply To: Time Scale

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Hi Andrey,

You wrote:

but the variation of [the delay] definitely has to be much less than 1 ms and the mean of such noise has to be zero.

The delay from your PC’s serial port hardware and OS will most certainly not be zero mean, nor will it less than one millisecond. Delays from the machine can be extremely lengthy and unpredictable.

The actual transmission rates can be expected to be less than the target due to limitations of the serial port’s bandwidth. To get data faster, you can
1) reduce the number of packets being broadcast by the UM7
2) increase the baud rate
3) connect to the UM7 with something running an RTOS to remove additional unpredictable latency.

But there is nothing wrong with the UM7, it is performing as expected.