Connecting RS422 Quad Encoder to NI 6602

I have 4 Quadrature Encoder that output RS422 signals that I would like to connect to the NI-6602 board. Will the differential signal levels of the RS422 match with NI-6602 counter timers inputs? Does any one have an example of the pin numbers to connect the A,!A,B,!B,Z and !Z signals to for the NI-6602 card.
Here is the PDF to the NI-6602 Counter Timer board:
http://www.ni.com/pdf/products/us/4daqsc386-393_386-387.pdf
Thanks for your help.

Hello,
If your "RS 422 signal" is a pulse going from 0V to 5V, then they should match with the inputs with your NI-6602. Chapter 4 of the manual found here describes how to make the necessary I/O connections for your board.
Hope this helps,
LA

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Z Channel of Quad Encoder Signal

Okay guys, I've got one for yous....
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I have to use a PCI 6602 to generate all six
channels of a quad encoder signal. This signal
must be of variable frequency, and have the
capability to be ramped. By ramped I mean I must
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Here is what I have so far:
Right now, the first four channels of the quad
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I set up a regular encoder signal (Channel X) to
trigger these four channels. Each of these
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ramping previously described.
What I'm stuck on:
I am bei
ng thrown by the Z-reset. This channel is
supposed to output a pulse every 2000 counts from
channel A. I configured Z to produce a triggered
pulse that has a 2000 count low part and a single
count high part. This works fine until I try to
ramp it.

Hey Spencer,
I appreciate your response. What was holding me up what the Z-Reset. To change the frequency of the all seven signals at once, I would manually go through and change the number of ticks each pulse was on. The Z reset would error out because the counter would still be outtputting a really long pulse while I was trying to change its frequency. Then one your your collegues suggested just changing the timebase's frequency instead of the number of timebase ticks each counter was on. This magically solved the problem. Now whenever I ramp the signal, I only have to change the timebase's frequency to change the frequency of the other seven counters! This makes the ramp function simpler and noticeably smoother!
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lp
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Hi jgcode,
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On further brainstorming of the idea, we discovered the same as above (cannot gate counter on FALSE) so am thinking we can have a non-gated count and a gated count and just do some maths to get around it.
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National Instruments
To the pessimist, the glass is half empty; to the optimist, the glass is half full; to the engineer, the glass is twice as big as it needs to be...

Reading quad encoder with 9870

Hi there, my project involves using a quadrature encoder to sense the position and degrees of two encoders.
I have successfully modified the example vi from http://zone.ni.com/devzone/cda/tut/p/id/3921 using NI 9411.
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Thank you

Hi Elman,
The filter clock is used to make sure that your signal has
integrity and eliminates glitches. In
order for signal to be counted, it must remain high for two consecutive periods
of your filter clock. There are five
time bases (5us, 1us, 500ns, 100ns and programmed) that can be used as your
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This is a great method to help eliminate errors that can be
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to divide the clock down to specific frequency.
It will divide the master clock down by an integer value and round it to
get a rate that is as close to the value entered. I would recommend leaving this number as
80MHz.
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of the filter clock. This property is
going to use the TimebaseRate property to create the predefined filter clock
settings. If your signal stays high for
two consecutive periods of the minimum pulse width, then it will be counted.
You need to determine the minimum pulse width that is
acceptable for your application. Since
your signal has a pulse width of about 360ns, you might want to use the
predefined filter clock of 100ns.
In short, you are creating a digital filter that will only allow
a signal to be recognized if it remains high for two consecutive pulses.
For further explanation, refer to the PCI/PXI–6602 User
Manual page 3-20.
http://www.ni.com/pdf/manuals/322137a.pdf
Respectfully,
Rob F
Test Engineer
Condition Measurements
National Instruments

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Thanks.

RPM Measurement using Quadrature Encoder and PXI 6602 counter

Hi,
I am on a project at work where I need to verify the speed (in RPM) of an unloaded motor which can operate up to 1400 rpm. After doing some research, i determined that a quadrature encoder could be used to make the measurement. I am looking at this encoder http://sine.ni.com/nips/cds/view/p/lang/en/nid/205321.
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Hey Gary,
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I have an angular encoder connected to a NI9401 daq. I put line A of the encoder to one of the digital inputs and the same with line Z (line B is not conected because direction is not relevant). However I'm having a hard time trying to get the velocity because I haven't been able to count the pulses and all the examples that I have seen they use counter that the NI9401 doesn't has.
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Hello,
What system do you have the NI 9401 module in … a compact DAQ or a compact RIO? Please provide this information. If you have the NI 9172 compact DAQ chassis, then placing the NI 9401 module in slots 5 or 6 will give you access to the counters on the back plane of the chassis.
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I want to be connected to the encoder with umi board.

hi anyone help me please !!!
i'm beginning labview
I use labview 2009 sp1 , MAX 4.6 ,PCI 7354 ,umi 7774 motion interface. i want to drive DC servomotor and p
osition control with encoder.
i have questions?
UMI 7774 have to connect with encoder that have A,A-,B,B-,index,index- ?
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Do i have to wire inverting gate?
I want to test the encoder test on MAX and wiring follow manual but no have encoder signal.
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thank for any advice you have
P.S. sorry my writing is bad. If i am not polite so sorry.
Solved!
Go to Solution.

i use second hand motor " pittman 14202 series".
a name plate is 14202D335-R1 385-22-001 24VDC 1000CPR 05-10-00.
a encoder maybe E30A. It have not Index channel because i measure A signal and Index signal.they're inphase.It's strange.
Do you think about it?
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thank you very much for reply
Attachments:
E30 encoder.pdf ‏99 KB
Pittman Motor__14202 Series.pdf ‏44 KB

How do I read DAQ at every state change on a quad encoder over RTSI

I have successfully routed either A or B encoder phase to the DAQ card over RTSI, but this gives you 1/4 of your encoder counts to the DAQ. Is there a way to trigger the DAQ clock with both the rising and falling edges, A and B signals so you get a DAQ reading with every encoder count?

mikema111,
From your explanation I am assuming that you are using an X4 encoder. Unfortunately there isn't a way to combine both Phase A and Phase B (rising and falling edges) into a DAQ scan clock without external circuitry.
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k on the output pin of the counter.
If you are just interested in counting the pulses in both Phase A and Phase B you can configure one counter to count on the rising edge and the other on the falling edge as described in the following Knowledge Base:
http://digital.ni.com/public.nsf/websearch/15170E05F0F4B65C86256E2400812CD9?OpenDocument
I also recommend reading the following document that discusses several different options when using a quadrature encoder with an E Series board (DAQ-STC).
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Ames
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National Instruments

Newbie needs help on Quad encoder for cRIO 9421

Hi,
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Mr. Bing,
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I need to implement a quadrature encoder on the 6602 board usinng c language.
I found some good function, for example DAQmxBaseCreateCIAngEncoderChan, but i think this function is only for DaqmxBase,
is there some similar function for Daqmx, or have i to do it myself?
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Thank you in andvance
There are 10 kinds of people. Those who understand binary notation, and those who do not.

Solved my problem.
I installed the daqmx version on CD and it was old.
Now i installed the new version daqmx 9.0 , that i toke from the site.
This version has the function i need DAQmxCreateCIAngEncoderChan,
it compiles , now i have only to attach my encoder.
Thank you lo stesso
Message Edited by blacksocket on 02-08-2010 05:32 AM
There are 10 kinds of people. Those who understand binary notation, and those who do not.

How to generate 2 breakpoints on an encoder using the NI-7344 without physically connecting the encoder to a second axis?

I'm using the NI-7344 motion-controller (for the control of 2 servo-motors) in combination with an E-series DAQ-card.
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thanx

Hello,
I am alittle confused about your application, but maybe this will answer your questions. In the "Configure Breakpoint VI" you can set the Axis or Encoder input as the following: Axis or Encoder is the axis or encoder to be controlled. You can enable Breakpoint Position on encoders mapped to axes 1 through 6 or directly on encoders 0x21 through 0x24.
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Regards,
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Connecting RS422 Quad Encoder to NI 6602

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