Read Data through RS232 4 Serial port and VISA parallely

[Vinaygowda]

Hello All,

I Have a Task to get a data from 4 measuring machines using NI DAQ serial card parallely  

the machine output are measured testing data and port is rs232 and I am connect 4 machines through NI serial DAQ to the computer

and I know to do program to get a data from 1 machine  at a time and problem is I need to get data from 4 machine parallely

like if I run 4 machine parallely the program should able to read all data at port without out loosing any data from it and save it to excel file.

can any one please help me to solve the problem

please revert back for any clarifications

looking forward fro your support

have a nice day

Vinay,

Vinaygowdamech5@gamil.com

[jay0909]

Hi,

         Which NI Serial Device are you using?

[RavensFan]

Set up 4 VISA serial ports, then 4 VISA Writes in parallel and 4 VISA Reads in parallel.

You are always at the risk of losing data if one of the devices doesn't happen to return data for some reason.

[Minions]

Could you add a schematic or a sketch showing how you are connected and what you want to achieve?

[arteitle]

I'm not confident that you can perform multiple VISA serial read or write operations in parallel, does anyone know? I recently tried to perform multiple VISA TCP/IP operations (on different IP addresses) simultaneously and found that at least VISA Open was blocking and couldn't be performed in parallel. 

[crossrulz]

I would have separate loops for each port and use a queue to send the data back to the logging loop.  I would also use TDMS to make things a little simpler since you can specify which channel the data goes into.

[Vinaygowda]

hello,

I am new to the LabVIEW can you please elaborate more about to get data parallel from Visa NI rs232/4

and I have one basic question for you

• how to know that which machine data is get through the NI RS232/4 serial port device while running parallel and how to recognize it ?
• can please make basic program to run visa parallel please do need full work

looking forward for your support

have a nice day

Vinay,

Vinaygowdamech5@gamil.com

[Vinaygowda]

NI serial device USB RS232/4

[GerdW]

Hi Vinay,

how to know that which machine data is get through the NI RS232/4 serial port device while running parallel and how to recognize it ?

When accessing the COM ports you should know which device is connected to which COM port…

When your devices offer the possibility to read some ID data you could try to ask them for that ID!

can please make basic program to run visa parallel please do need full work

Use the BasicSerialReadAndWrite example VI.

4 times in parallel!

[Vinaygowda]

Dear GerdW,

Thanks for Reply

can please make basic program to run visa parallel ?

Use the BasicSerialReadAndWrite example VI.

4 times in parallel!

After placing 4 basic serial read and write

how can I control that 1st serial read and write has to read COM PORT 1 and 2nd serial read and write has to read COM PORT 2 

Kind Regards

Vinay,