Send the signal current/voltage/USB DB25 to regulation of pump to

Hi all!

I want to control the speed of a pump with LabVIEW (Thermo Fischer FH100M, Manual) and so I have to send a current or a voltage signal to the pump. The pump has only one DB25 port. As my laptop is not a port DB25, I tried to control it with a USB converter.

I had only a converter USB to DB9, so I started with (laptop) USB-DB9-DB25 (pump) > >.

When I connect the pump on the USB port, it is instantly put in market, but in a strange way.

Is it possible to use this configuration? Or is it possible to use at least USB-> DB25 (I have the Setup, see manual page 45/3-19)? Then, I would order that the cable companies.

Or do you have other suggestions?

Thank you very much in advance!

Tobi

Tobi,

Stop it! Do not connect your converter to this device.

When you say "Converter USB to DB9" are you referring to a USB converter to RS - 232? DB9 is just a connector and therefore DB25. TOU can wire anything to this connector.  Your converter is probably wired as a serial RS-232 port.

The manual shows clearly on page 3-19 and the following pages that the control of the pump is NOT wired for RS - 232!  By looking at the speicifications for the inputs and outputs you shown on page 3-20 and 21 may damage the USB to RS-232 conveter or the controller of the pump by connecting them.

To control this device you will need to a DAQ with analog input, analog output, material inputs digital, digital, outputs a counter. You will also need some external circuits such as transistors or relay static solod DC in proportion.

Lynn

Tags: NI Software

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