Servo motor using parallel port

Hello,
I have a XY mirror scan Servo motor used for optical scanning experiment.
The question I have is:
I already have a program to control stepper motor via parallel port. Can I use the same to control servo motor ?
Or is the SERVO motor concept different to that of a STEPPER motor ...
Thank you
Abhilash S Nair
Research Assistant @ Photonic Devices and Systems lab
[ LabView professional Development System - Version 11.0 - 32-bit ]
LabView Gear:
1. NI PXI-7951R & NI 5761
2. The Imaging Source USB 3.0 monochrome camera with trigger : DMK 23UM021
OPERATING SYSTEM - [ MS windows 7 Home Premium 64-bit SP-1 ]
CPU - [Intel Core i7-2600 CPU @ 3.40Ghz ]
MEMORY - [ 16.0 GB RAM ]
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You will need a DAQ card that can generate the voltage needed to send a command signal to the 671. The 671 will need to be tuned to the 6880 with whatever sized mirror is attached. (If you bought the galvo and servo driver as a package it should already be tuned.)
CTI systems take in an analog command from -10 to +10 Volts. Almost all the NI DAQ cards (and many other brands) output +/- 10 Volts so that will be easy.
Then you will need to decide how to scan your target. A ramp pattern or triangle wave is the usual choice for scanning objects so you need to generate that in LabVIEW code along with the code that will read your sensor. This should be done simultaneously but you really don't need a very expensive DAQ card to accomplish that. Look on the NI website for options in your price range and do some research...
Is your system one axis (one 6880 and one 671)? If so you will scan a raster (ramp or triangle) to measure a single line of light intensity, move the stage a tiny distance and scan another line. When you put all the lines together into a 2D image you will have a representation of one face of your object. Many people use a rotary stage to spin the object while scanning to assemble a 3D model of the object. This is a bit more complex of course.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

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Dennis Knuston
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Dear all,
i am a beginner user of LabVIEW and i want to write a vi in using parallel port for digital I/O. After reading the article "Using the Parallel Port in LabVIEW
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Driving stepper motor via parallel port

Hi everybody,
I want to drive a stepper motor via the parallel port. The problem is to
create a constant frequency on a digital line of the port. I tried to do
so with a While-Loop with a certain delay, but the frequency varys due
to occurrences like mouse-movement (due to the call-ups of interrupts I
think).
Any Ideas?
Regards
Martin
Attachments:
Martin.Eis.vcf ‏1 KB

How about a simple NE555 timer circuit to externally create the constant
frequency, then use a bit in the parallel port to enable and disable the
NE555 circuit? You could probably go to Radio Shack and pick up the
components for less than $10.
Jim
Martin Eis wrote in message
news:[email protected]..
> Hi everybody,
>
> I want to drive a stepper motor via the parallel port. The problem is to
> create a constant frequency on a digital line of the port. I tried to do
> so with a While-Loop with a certain delay, but the frequency varys due
> to occurrences like mouse-movement (due to the call-ups of interrupts I
> think).
>
> Any Ideas?
>
> Regards
> Martin
>

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Hello,
I am trying to use my parallel port to control a relay network and have run into a problem. I am using the outport instead of visa because for some reason I get an error with visa and outport seems more simple. The problem I am having is that my program doesn't seem to be able to initially take control of the port. What I mean by this is that if I restart the computer and open/run my program, I get an incorrect output on the parallel port. However, if I run one of the example programs for controlling the paralle port using outport (attached) (I believe the one I use is called Reading and writing to parallel port using loops) I am able to control the output to the parallel port. Also, after the example has run, my program works correctly. However, if I restart my computer again and run my program first it can no longer control the port correctly. So the problem seems to be that my program isn't initializing the port correctly or assessing it right at the beginning of the program. However, looking at the example program I don't really see what they are doing that I am not. I have the correct port address.
My program takes values from a text file and displays them on the port and that works correctly.
Attachments:
CircuitTopModule.vi ‏26 KB
parallel port examples.llb ‏72 KB

Hi Jag213, I'm glad you were able to resolve the issues you discussed on the other forum related to this issue.
Now that you have it working, I would recommend a few things:
1. Just try modifying one of the existing examples and see what you can get away with removing in order to keep it working the first time.
2. Try modifying the timing on your example - 10 seconds is a long time to wait between each week, I wonder if you are getting a time out? Do the examples work when you insert that kind of timing delay?
3. Add the In Port.vi into your code - this may be related to getting your Out Port.vi to work correctly.
4. Your code controls 8-bits on the parallel port, while the examples control 32-bits. Do all 32 bits need to be initalized? Looking at the Parellel Port Read and Write Loop.vi Example, in the IO Connector Status, the 31st bit controls whether the target is initialized.
Play with these settings and see if you can get yours to work the first. If all else fails, build your program to run off of one of the examples. For example, have the while loop run once, and then call yours as a SubVI.
Good luck!
Joey S.
Software Product Manager
National Instruments

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Hi, i will use labview for my thesis project and i plan to input my data via parallel port.
My input data is 8 bits so i tried to use control and status lines of the parallel port.
I used the method that is described at NI`s developer zone web page which shows using control and status lines.
http://zone.ni.com/devzone/conceptd.nsf/webmain/72c6fc6ce4ad4d1386256b1800794596?OpenDocument
By using that method i achieved to input first 4 bits of my data over status lines while there were no change at those of control lines.
Because my data that i want to input consists of 8 bits, i could only be able to manage half of it.
what can i do for using control lines?
Or as a second alternative, is there any way to input 8 bits over data register?
Below i have attached the code that i had written to input by using control and status registers.
Attachments:
can1.vi ‏30 KB

Well, I looked at your VI and it looks like you have everything setup right. The only thing I can think of is that you are not grounding the control lines when you want to set them low.
As far as your second question is concerned some parallel ports can be bidirectional. The article that you provided explains how you can test if you parallel port is bidirectional, and gives an example on how you would read and write from the data bits.
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Shawn B.
National Instruments
Use NI products on Linux? Come join the NI Linux Users Community

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Can anyone help me with this problem?
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How counter and frecuency measurement using parallel port?

Estoy ingresando un tren de pulsos por una linea del
puerto paralelo y necesito detectar los flancos para poder incrementar un contador por cada pulso de entrada.

Dear, codeman2:
I thank for infinitely its advice to him. But I must work with the parallel port because one is a didactic project and do not have average acquiring the acquisition boards. In addition to be in a stage of study and investigation all inverted time will bring futures benefits. Thank you very much by his interest and it excuses my ingles.

I am trying to acquire pulse signal (TTL 0 ,+5v) using parallel port (SPP 25 pins) on pin 12.

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So my questions are:
1) How can I do to read only pin 12.
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I attached the I am using.
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pin 12 is bit 5(32 decimal) of the byte you read from port 379h. So actually 58 is +5V and 78 is 0V.
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hello guys.. Please Solve my Problem..
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well I cannot give a more detailed answer than "use the java comm API".
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I don't know if this will help you, but think about this tip:
On the back of my (digital-) Servo package there was some data written (see attached image).
You've heard of PWM (Pulse Width Modulation)? If not look it up in
wikipedia / microcontroller.net / (if you speak german) http://www.rn-wissen.de/index.php/Servos or google
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void set_Servo_0(uint8_t angle)
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PORTA |= 1; // port high
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PORTA &= ~1; // then pull down
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mSleep(250); // Finally I have to wait for this time (in ms) when I send different angle parameters one after another, to let the whole system
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Attachments:
Servo.jpg ‏207 KB

Parallel Port access using Java

hello guys.. Please Solve my Problem..
I have to access motor through pc using Parallel Port. I want to know how to program in java to access Parallel Port. So How can i code to access the any Port of Parallel Port. Please Guide me in this..
I have tried using parport (code given below )---------------->but it gives error hs_err_pid2172.log (error explanation given at last ). Please tell me what is the problem or if u have any other alternative to access Parallel Port
//===============================================================================
//code :
package parport;
public class ParallelPort
private int portBase;
public ParallelPort(int portBase)
this.portBase = portBase;
public int read()
return ParallelPort.readOneByte(this.portBase+1);
public void write(int oneByte)
ParallelPort.writeOneByte(this.portBase, oneByte);
public static native int readOneByte(int address);
public static native void writeOneByte(int address, int oneByte);
static
System.loadLibrary("parport");
import parport.ParallelPort;
class SimpleIO {
public static void main ( String []args )
ParallelPort lpt1 = new ParallelPort(0x378);
lpt1.write(240);
===================================================================================
ERROR file : hs_err_pid2172.log
# An unexpected error has been detected by Java Runtime Environment:
# EXCEPTION_PRIV_INSTRUCTION (0xc0000096) at pc=0x1000107b, pid=2172, tid=2108
# Java VM: Java HotSpot(TM) Client VM (10.0-b23 mixed mode, sharing windows-x86)
# Problematic frame:
# C [parport.dll+0x107b]
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
--------------- T H R E A D ---------------
Current thread (0x02b5c000): JavaThread "AWT-EventQueue-0" [_thread_in_native, id=2108, stack(0x02fd0000,0x03020000)]
siginfo: ExceptionCode=0xc0000096
Registers:
EAX=0x000000ff, EBX=0x26a28380, ECX=0x000000ff, EDX=0x00000378
ESP=0x0301f2f4, EBP=0x0301f308, ESI=0x26a28380, EDI=0x02b5c000
EIP=0x1000107b, EFLAGS=0x00010246
Top of Stack: (sp=0x0301f2f4)
0x0301f2f4: 10001041 10000378 000000ff 000000ff
0x0301f304: 02b50378 0301f34c 00989c91 02b5c0f4
0x0301f314: 0301f354 00000378 000000ff 02b5c6f4
0x0301f324: 02b5c6f4 02b5c6e4 0301f32c 26a28380
0x0301f334: 0301f360 26a28618 00000000 26a28380
0x0301f344: 00000000 0301f35c 0301f384 00982cb1
0x0301f354: 26a285b8 00988099 000000ff 00000378
0x0301f364: 0301f364 26a28255 0301f390 26a28618
Instructions: (pc=0x1000107b)
0x1000106b: cc cc cc cc cc 33 c0 66 8b 54 24 04 8a 44 24 08
0x1000107b: ee c3 66 8b 54 24 04 66 8b 44 24 08 66 ef c3 66
Stack: [0x02fd0000,0x03020000], sp=0x0301f2f4, free space=316k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [parport.dll+0x107b]
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::StubRoutines (1)
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::StubRoutines (1)
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x00295800 JavaThread "DestroyJavaVM" [_thread_blocked, id=2164, stack(0x00870000,0x008c0000)]
=>0x02b5c000 JavaThread "AWT-EventQueue-0" [_thread_in_native, id=2108, stack(0x02fd0000,0x03020000)]
0x02b5ac00 JavaThread "AWT-Windows" daemon [_thread_in_native, id=3640, stack(0x02f30000,0x02f80000)]
0x02b59c00 JavaThread "AWT-Shutdown" [_thread_blocked, id=2204, stack(0x02ee0000,0x02f30000)]
0x02b59000 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=3740, stack(0x02e90000,0x02ee0000)]
0x02addc00 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=372, stack(0x02d90000,0x02de0000)]
0x02adb400 JavaThread "CompilerThread0" daemon [_thread_blocked, id=608, stack(0x02d40000,0x02d90000)]
0x02ad6c00 JavaThread "Attach Listener" daemon [_thread_blocked, id=3920, stack(0x02cf0000,0x02d40000)]
0x02ad6000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=808, stack(0x02ca0000,0x02cf0000)]
0x02ad1800 JavaThread "Finalizer" daemon [_thread_blocked, id=1736, stack(0x02c50000,0x02ca0000)]
0x02acd000 JavaThread "Reference Handler" daemon [_thread_blocked, id=2728, stack(0x02c00000,0x02c50000)]
Other Threads:
0x02acbc00 VMThread [stack: 0x02bb0000,0x02c00000] [id=624]
0x02ae7800 WatcherThread [stack: 0x02de0000,0x02e30000] [id=580]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 960K, used 262K [0x229e0000, 0x22ae0000, 0x22ec0000)
eden space 896K, 22% used [0x229e0000, 0x22a11830, 0x22ac0000)
from space 64K, 100% used [0x22ad0000, 0x22ae0000, 0x22ae0000)
to space 64K, 0% used [0x22ac0000, 0x22ac0000, 0x22ad0000)
tenured generation total 4096K, used 344K [0x22ec0000, 0x232c0000, 0x269e0000)
the space 4096K, 8% used [0x22ec0000, 0x22f161a8, 0x22f16200, 0x232c0000)
compacting perm gen total 12288K, used 289K [0x269e0000, 0x275e0000, 0x2a9e0000)
the space 12288K, 2% used [0x269e0000, 0x26a286b0, 0x26a28800, 0x275e0000)
ro space 8192K, 66% used [0x2a9e0000, 0x2af30f10, 0x2af31000, 0x2b1e0000)
rw space 12288K, 52% used [0x2b1e0000, 0x2b8306d0, 0x2b830800, 0x2bde0000)
Dynamic libraries:
0x00400000 - 0x00423000 G:\Program Files\Java\jdk1.6.0_07\jre\bin\java.exe
0x7c900000 - 0x7c9b0000 G:\WINDOWS\system32\ntdll.dll
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0x77fe0000 - 0x77ff1000 G:\WINDOWS\system32\Secur32.dll
0x7c340000 - 0x7c396000 G:\Program Files\Java\jdk1.6.0_07\jre\bin\msvcr71.dll
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0x773d0000 - 0x774d3000 G:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll
0x5d090000 - 0x5d12a000 G:\WINDOWS\system32\comctl32.dll
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0x71ab0000 - 0x71ac7000 G:\WINDOWS\system32\WS2_32.dll
0x71aa0000 - 0x71aa8000 G:\WINDOWS\system32\WS2HELP.dll
0x6d640000 - 0x6d649000 G:\Program Files\Java\jdk1.6.0_07\jre\bin\nio.dll
0x77120000 - 0x771ab000 G:\WINDOWS\system32\OLEAUT32.DLL
0x10000000 - 0x1000b000 G:\Program Files\Java\jdk1.6.0_07\bin\parport.dll
VM Arguments:
java_command: parport.NewJFrame
Launcher Type: SUN_STANDARD
Environment Variables:
CLASSPATH=G:\Program Files\Java\jdk1.6.0_07\bin;G:\java\classes
PATH=G:\Program Files\PC Connectivity Solution\;G:\Program Files\Java\jdk1.5.0_07\bin;G:\WINDOWS\system32;G:\WINDOWS;G:\WINDOWS\System32\Wbem;G:\Program Files\K-Lite Codec Pack\QuickTime\QTSystem\;G:\Program Files\Java\jdk1.6.0_07\bin;G:\Program Files\Microsoft SQL Server\90\Tools\binn\;G:\Program Files\MATLAB\R2007b\bin;G:\Program Files\MATLAB\R2007b\bin\win32
USERNAME=shankar
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 4 Stepping 7, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 2
CPU:total 2 (2 cores per cpu, 1 threads per core) family 15 model 4 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3
Memory: 4k page, physical 457196k(30972k free), swap 1074312k(241668k free)
vm_info: Java HotSpot(TM) Client VM (10.0-b23) for windows-x86 JRE (1.6.0_07-b06), built on Jun 10 2008 01:14:11 by "java_re" with MS VC++ 7.1
time: Thu Oct 09 13:47:18 2008
elapsed time: 7 seconds

I have same problem...
No one more have solve this?
I alread have tried use RXTX library..
but I have:
java.io.IOException: The device is not connected.
I think that pass-motor don't have correct response for pararell protocol (I need use it with direct write, no ack signal, no read, etc)

Using stand alone executables to send data to the parallel port

I have a executable that uses the parallel port to activate an alarm. The program works well on the base machine which is running windows XP. However when I try to run the stand alone executable on a windows NT machine there is nothing sent to the parallel port. I have updated the Cvirt file on all machines. I don't get any error messages when running the stand alone executable.

I have the same situation using parallel port to control a hot swap PCI extender card and no error showed. I can turn on/off and read correct voltages from the card in base machine. After creating executables, I can turn on/off the card, but got wrong voltages in target machine.
I've installed AccessHW in both machines and copied AccessHW.dll and cvirte.dll to system32 folder and the folder same with executables. I also tried installer with port support and serial support checked.
Windows XP is in both machines and LV 7 in base machine. I use "Output Byte to Port.vi" and "Input Byte from Port.vi" in AccessHW lib.
One thing I observe is initiation. The card manufacturer provides a program with same functions. After running their program, the voltage readings from the executables become correct. The readings remain good after closing their program. I close the executables and run the executables again and still see good results unless restarting the target machine.
Any solution for the problem? Thanks in advance!

JTAG Digital Waveform transfered using USB or parallel port ?

Hi all
I was wondering if there is a way to send JTAG Digital Waveforms generated by LabVIEW into a parallel port or USB port. I know that there is a way to use DAQmx devices with JTAG Digital Waveforms where DAQmx drivers take JTAG Digital Waveforms and transfer that into physical signals which is then send to UUT. I really am in a need to try to mimic whatever a DAQmx can do to make that happen with a parallel port or usb port. I would really appreciate if you can help me it is very urgent.
Thanks

Hi Cristopher
I do really appreciate for a quick response. I am full aware of the fact that NI products for digital waveform generation will do the job, plus it is easier to implement them. However my goal is to use an inexpensive device that can generate external timing and my JTAG library and make .exe files from my final code and distribute that setup for several computers in factory. So buying several digital waveform generators from NI for each PC in factory will be a very expensive option. I think now you have a better picture why I am trying to find another inexpensive way to implement these digital waveforms using JTAG library. It would be ideal if I can use parallel port with some external timing to do the trick but I am really not sure where to start. Cirstopher I would really appreciate if you can come up with any suggestions in regards to this problem that I am having.
Thanks again.

Servo motor using parallel port

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