Encoder movement response too slow

I have a USDigital QSB-D USB/serial encoder which uses a serial uart interface at 230.4 kb/s, 8 bits, no parity, 1stop bit. The USDigital driver (USDQSB.dll) allows me to open/close and read/write to registers and provides get/set functions to set specific modes. The driver provides StreamEncoderCount function which takes threshold and intervalRate parameters. The threshold specifies count changes to trigger transmission and the intervalRate is time interval between transfers. In the attached VI I am attempting to use the StreamEncoderStatus() function to wait for the encoder index pulse which indicates the encoder has passed zero counts. When the index pulse is detected I would like to use the StreamEncoderCount function to retreive encoder counts as rapidly as possible. I am setting the threshold to 0 so it will read the count even if it is not moving and intervalRate to 1 which should be sending count value at 1.9 msec intervals. The for loop count ie 100 which should take 190 msec to read at 1.9 msec. The for loop takes over 3 sec which means that the sample rate is over 30 msec instead of 1.9 msec. I am using a notification to notify another the other while loop which plots the results. Everything works as intended except for the slow response of 30 msec per sample instead of 1.9 msec.
John
Attachments:
QSBEncoder2.vi ‏72 KB

I was not able to find your dll benchmark application to do that test but I am beyond that now. I have found the correct function to read streamed serial input from the encoder which is the USDQSB.dll function: GetCountWithTimeStamp() which apparently just reads the streamed serial input and does not query the count register repeatedly. The attached QSBEncoder3.vi uses that function and performance is as expected.
I have rewritten the encoder application to use the VISA driver. The encoder is automatically recognized as a serial device by VISA and assigned the instrument ID: ASRL3::INSTR. The attached QSBEncoder4.vi attempts to access the encoder using VISA but I don't get any response from the encoder serial port. Any ideas on what I am doing incorrectly? I am able to access the encoder using the VISA interactive control but when using the LabView QSBEncoder4.vi application I don't see any input coming from the ASRL3::INSTR device.
John
Attachments:
QSBEncoder3.vi ‏71 KB
QSBEncoder4.vi ‏80 KB

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Photo_op8 wrote:
BradKaye wrote:
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Encoder movement response too slow

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