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Wiring "Open Collector Output Wiring" to NI-9361 counter module
MVG1
Member
04-18-2017 03:43 PM
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Hello,
I'm trying to install a wheel encoder on our test truck so that we can more accurately measure distance and speed of the truck while we do the tests. The issue I am having is that I do not see the counter signal in NI MAX to make sure I wired the thing correctly.
I bought the wheel encoder (a Red Lion zmd1000b) from Omega. Its data sheet says it has an open collector output. Quoting the data sheet: "NPN open collector outputs are current sinking devices. An output signal will not be generated unless a pull-up resistor is connected from the open-collector to the positive side of an external supply. The same supply can be used for powering the unit and for the pull-up resistor." The data sheet shows the cable wire color:
Red - +VDC,
Black - Com,
A - White,
B - Green,
Bare - Shield.
We have a 4 slot cDAQ-9132 so I also bought a dedicated counter module NI-9361 with the DSUB 9923 connector block to wire everything. The documentation for the 9361 module shows that it has an internal pull-up resistor that can be enabled or disabled. I figured I could enable it to be able to get the signal from the wheel encoder. However, I have not been able to find the option to switch it on or off. I have tried the wiring configuration as in Figure 6 of the NI-9361 Starting Guide but the counter does not increment.
Do any of you have recommendation of what I could try next to get the encoder to put out the signal? Thank you.
More pertinent info about our system running:
-LabVIEW 2015
-DAQmx Device Driver 16.1.0
-NI-9237 and NI-9201 modules to monitor load cells and stringpot
-External 10V power supply to power load cells and encoder
rsmayer
NI Employee (retired)
04-20-2017 12:19 PM
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Hello,
I saw this KB which might be of use to you.
NI 9361 Will Not Enable Differential or Pull-Up Resistor Mode
There is a snippet of example code, and so you can just click and drag it into your existing project. I think the property node where you enable the pull-up resistor is what you are looking for.
-Ryan
