Determining the Serial port number

I need to test my board on 3 PCs randomly.Each time i connect the board the serial port number like "com 18" is getting changed.Now the comport number i am using is 40.Though i dont any other USB connection.Though i refresh i still get the data only if i define the port number as 40.Is there anyway to determine the port number.Also can someone tell me why this is happening?
Solved!
Go to Solution.

I think you have USB 1.0, it will always take a new port number if you install a new one. (:unsure)
To find the right COM-Port of your device you can do following:
1) send anything on each port and wait a little for the right answer, if OK,than take this port for communication.
or 2) you can get the description string of all ports installed from the device manager. If your USB-Serial-converter have a unique description string, you cann compare all descriptions with your one, and if it conforms, thank take this port for communication.
LabVIEW Portal

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AppleScript to determine if serial port has something connected

Hi all,
I'd like to know if it is possible to detect if something is attached to the serial port.
I have two USB uart which are connected to my mac mini. They are recognized by the serial port as "usbmodem" and then a number.
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I think your problem is going to be two-fold.
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How to change the listener port number on a standby database

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Hi
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I want to build an array using the data that I get through the serial port

I am reading data through the serial port, but I want to buffer these data. I have seen a function, but i think that i can use this if I am reading data from I/O intrument, so I don´t how can I fill an array, with the data that I am reading!!!
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I'll hazard a guess that you are reading data with VISA as a string. Then you want to convert that (probably with Scan From String) into a number. Then, you want to collect those numbers into an array.
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Hi,
I am trying to measure FORCE using an electronic BALANCE from the serial port. My measurements are strange! The BALANCE sometimes give ZERO reading! Is it because of the sample rate, baud rate etc? I have attached the readings concerned.
Attachments:
databalance.doc ‏144 KB

I think your problem is due to the way you read the weight :
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CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Sending Hex text files to the Serial Port

Hi,
Does anyone know or have any experience in how to open a Hex file, read
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Regards,
Martin.

Martin Stanley wrote:
>
> Hi,
> Does anyone know or have any experience in how to open a Hex file, read
> the data and send it down the serial port.
>
> Regards,
> Martin.
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I have a vi that reads a hex file then sends the data out the serial port.
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Any time you get an error in LV you can right click on the error cluster indicator and do a "Explain Error".
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Ben Rayner
I am currently active on.. MainStream Preppers
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I can not communicate with the FP-1000, using the serial port.

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Hello,
There are a number of things that you can try when you are experiencing communication problems with a FP-1000.
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We need a way of connecting the PS/2 keyboards to the serial ports of the Sparc workstation. We already have a piece of software that will read ascii values from the serial port so we definately want to go through the serial ports.
Can someone please suggest what converters will be required to get the output of the keyboard and trackerball as ascii input to the serial port.

Actually, that's not a bit perverse, at all.
Jonathan's suggestion is a standard method of connecting to a server.
(null cable between the computer serial ports)
... see the Solaris man pages.
man tip
TeraTerm and Hyperterminal are customarily used on a PC running some dialect of Windows.
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and keyboards are not serial communication devices.
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How to get a signal from the serial port to start a labview program?

I need to synchronize the data obtained from a program (which is not in Labview)with the data collected with Labview on a different computer. I can send some data strings to the serial port of the computer running the Labview program when the other program starts. However, I need to be able to read the trigger in my Labview program. Do you know what I should do? Thanks.

If you don't have any other programs listening on the COM port, you need to let a LV program run BEFORE the signal comes, otherwise you won't be able to read it. You can have the program wait in a slow timed loop so that it doesn't use up too much CPU time, and when the required "trigger" comes, to move into the main part of the program.
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Attachments:
Wait for serisl message.vi ‏17 KB

How can I use the output value from SIMPLE PID to write something to the serial port?

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you know how to communicate to serial port, but you don't know how to send a value from SimplePID to serial port???
You know how to communicate, but then you don't know how to communicate???
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Edit:
From you first post you know what values your motor driver is expecting. You know which values the PID.vi is providing. Now all you need is a formula to reshape the values from PID to the motor. It's up to you to make such a formula. Unless you provide any details we cannot give more precise answers...
Message Edited by GerdW on 02-28-2010 08:35 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Is it possible to choose the serial port if only the run time engine is installed

I have an application, which communicates over the serial port. When I use the full version of Labview I can change the serial port without any problem from Com1 to Com2 (similar to the example “Hardeware input output -> serial -> Labview serial vi"). When I build an application and try to run this program on a computer where only the run time engine 6.1 is installed, it is not possible to choose the serial port. Since there is no “Measurement and Automation Explorer” available on the run time engine and no directory C:\VXIpnp is created, when the run time engine is installed, I do not see a way, how I can satisfy the computer with the information it needs for configuring
the different ports. Any suggestions?

Hi Daniel,
Before LV6.1 there was LV5.1 In LV5.1 the way to Spedify a resource was to use a string control with correct VIsa Resource Class identifier. For eg. "GPIB0::11" or "ASRL1::INSTR". With Introduction of VISA Resource Name Control and linking with MAX, These names are Available from Pull Down List and Can be Aliased, meaning ASRL1 which is Serial Port 1 can be called COM1 and so on. However the old method still works with all 6.1 Controls. Only thing is you have to make sure you Dont Conflict the Class Names ie Use "GPIB::.." instead of "ASRL..." when addressing Serial Port VI's.
To solve your Problem I would Build a Menu ring with COM1 to COM4 in the Pull Down List.
Next, If I use the Traditonal Serial Port VI wich accepts the Integer as Seria
l Port #. I just Wire the Menu Ring to this VI.(Remember COM1 is 0, COM2 is 1 for this VI)
If I use VISA Config Serial Post. I build an Array Constant with Corresponding VISA Class Names So in our case a String Array Constant of 4 elements "ASRL1::INST" to "ASRL4::INST". I Use Index Array Function With the Index Wired to my Menu Ring. The Array Input Terminal Wired to the Array Constant. The Output of this Array will be correct Visa Class Name Based on slection of my Menu Ring. I can Wire this as Input to my VISA Config Serial Port Vi.
I have attached a Small VI to Illustrate this.
Drawback: You must Predefine what Ports you will Want to Use. Basically you define all the cases.
I hope this Answers your Q!
Good Luck
Mache
Good Luck!
Mache
Attachments:
Serial_Port_Select.vi ‏36 KB

Determining the Serial port number

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