Nexus conditioning amplifier 2693

[hannabob]

We are having trouble setting up our system and need help:  We have an accelerometer ( 4508B 004, from Bruel & Kjaer) and the Nexus conditioning amplifier (2693 A from Bruel & Kjaer), we installed the Driver for labview, however we were wondering:  Can we directly read the data through labview or do we have to connect it to the DAQmx (USB 6003) ?

[Henrik_Volkers]

I *think* that all values shown on the display can be read via RS232, but you can't read the actual value (with bandwidths up ?? 100kHz)

Detailed information *should* be in  the manuals provided.

If it can be read via RS232, you can read it with LabVIEW.

I would pick up the phone or email Bruel&Kjaer.

[majoris]

Do you have a manual for the Labview drivers or serial commands? I don't see it on their website. However, there is some interesting information in the device manual (https://www.bksv.com/-/media/literature/Product-Data/bp1702.ashx) about the serial communication.

SERIAL INTERFACE
Conforms to EIA/TIA-574 (RS–232)
Baud rate: 2400, 4800, 9600
...
Communication speed for a baud rate of 9600:

...

• Transmission time for one command of 5 characters and to receive
an echo after each character is ~ 8 ms
• Execution time for one command is 100 ms to several seconds
• Response time after requesting a status of one load: <0.5 s
• Response time after requesting a peak meter reading: <0.5 s

So it seems like getting data off this thing is pretty slow. The USB DAQ you have is more suited for sampling the analog outputs from the device. However, at 100kS/s, even it is kinda limited considering the full bandwidth of the outputs is 100kHz. But to me it is better to use DAQmx and the USB DAQ than waiting half a second to poll for updates. But maybe there are more commands that are quicker.

[hannabob]

Thanks your answer helped alot!

Best, 

Hanna