Jump to content

Support for 16/32 Serial ports (RS232)


Recommended Posts



I need to control up to 32 serial port devices (RS232) using Labview.

Can any body recommend a product that will do this?


I have been looking at Terminal Servers (e.g. http://www.perle.com/products/Terminal-Server.shtml)

Does anybody know if I can use this device with Labview to access each RS232 device.(NB: I can currently access each device using TeraTerm).  The recommended retail price for a 16port unit is £800.

Can anybody suggest a cheaper solution?


Thanks in advance.



Link to comment

NI offers this 16-port serial card to plugin to your computer. http://sine.ni.com/nips/cds/view/p/lang/en/nid/207740

Probably be your best solution. Details below.

NI PCIe-8430/16 (RS232) High-Performance, 16-Port RS232 Interface for PCI Express
  • Compatible with Windows and LabVIEW Real-Time OSs
  • Flexible standard and nonstandard baud rates from 2 baud to 1,000,000 baud
  • Better than 0.015 percent accuracy for standard baud rates and 0.5 percent for nonstandard rates
  • High-speed DMA interface and 128 B transmit and receive FIFOs minimize CPU overhead
  • Includes two 8-port breakout cables (68-pin VHDCI to eight D-Sub 9-pin male ports)
  • NI-Serial driver includes free NI-VISA API for easy programming

Link to comment

When I see that many ports needed, I gravitate towards the terminal server option. You will reach a point when you need multiple computer access to the ports or want to locate the computer(s) an extended distance from the UUTs. 


Yes, you could share the 8430 ports remotely through VISA, but I'll take a device that is designed to be left on for 24/7 for years over a Windoze / Antivirus / desktop PC (HD and RAM failures) combo that inevitably suffers a BSOD in the middle of a critical high utilization run.


I've just switched out some very old Equinox terminal servers with the Perle IOLAN STS16 and they are very nice. I use both telnet and socket based connections to my UUTs without a problem. The price for either solution seems to be about the same.

  • Like 1
Link to comment

We use terminal servers for this all the time. Moxa, Advantech, Digi and Westermo.


The virtual serial port drivers that come with these devices never (the ones from Digi might be the exception)  handle network connection issues gracefully. If the network goes down for example, the drivers will freeze - and this can cause VISA to freeze or crash.


However, if you use raw TCP/IP connections and write your own client (VISA has in-built functionality for this as well...I'm not sure if that's robust though), then you can make all of them work nicely.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.