Multiple USB-6525 connection

[ntran12]

Hi, 

I have a setup that contain 36 USB-6525 and currently connecting to a computer using a 16 channel usb hub. I'm currently control the USB-6525 using python with nidaqmx package. I'm currently running into issue that sometimes the SSR give me error of not available when I use a big code that also control 4 potentiostats together. However, when I tried to control those SSR using a separate code that is used to switch the SSR and it works fine so I was just curious if you would have any suggestion for how I should connect 36 SSRs to my computer? and would the data transfer rate affect this? I'm thinking maybe because the data bandwidth of my computer is so small so that it create some problem like this. 

I'd like to thank you very much for all the help.

[ZYOng]

Each USB-6525 has 8 DO, and you are using 36 units of USB-6525 to control 36 SSR?

What is the exact error code and message when you encountered with "SSR give me error of not available"?

[santo_13]

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@ntran12 wrote:

Hi, 

I have a setup that contain 36 USB-6525 and currently connecting to a computer using a 16 channel usb hub. I'm currently control the USB-6525 using python with nidaqmx package. I'm currently running into issue that sometimes the SSR give me error of not available when I use a big code that also control 4 potentiostats together. However, when I tried to control those SSR using a separate code that is used to switch the SSR and it works fine so I was just curious if you would have any suggestion for how I should connect 36 SSRs to my computer? and would the data transfer rate affect this? I'm thinking maybe because the data bandwidth of my computer is so small so that it create some problem like this. 

I'd like to thank you very much for all the help.

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Is it a reputable USB HUB or the cheap clone one? to confirm, how many SSR are you controlling?

IMO, it doesn't seem to be a wise solution to connect 36 x USB-6525 through 16 x USB HUB

[crossrulz]

For 36 relays, you need 5 USB-6525 units (8 per module). I would feel more inclined to go with something like this guy: Numato Lab 64-Channel USB Relay Module as it would then only be 1 module to communicate with instead of minimum 5.

Is that USB Hub externally powered? If not, that could easily be your problem, especially with laptops, as mother boards tend to have USB hubs that are underpowered.