multiple rs232 devices on a single rs 232 port on cRio

[ManuelQ]

Hello

I am communicating to a serial device connected to a cRio NI9076 succesfully using NI VISA. It has only one rs232 connector.

Now I need to connect two additional serial periphical devices to the cRio NI9076, which has only one rs232 port. Can I use an rs232 hub and still communicate using NI VISA? Will MAX recognize this?

Thank you!

[nyc_(is_out_of_here)]

one RS232 port per instrument

[Valerio.S]

Hello Manuel,

the problem with HUB is that most of them need a driver to be installed and it's very difficult to found one compatible with OS Real Time. In any case there are a couple of solutions for your question.

You can either use a "passive" hub that does not need a driver like: ENET-232 or ENET-485

Can I Use the ENET-232 or ENET-485 on Systems with VISA Support Only?
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019LveSAE&l=en-US

or you a module 9870, 4-Port, RS232 Serial Interface Module for CompactRIO
https://www.ni.com/en-us/shop/model/ni-9870.html

I hope this help,

regards,

Valerio

[ManuelQ]

Thank you for the hints.

I think the module could be a solution. Another thing I suppose I could do is to simply use an RS232 to USB converter, like this one:

http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/4-Port-USB-to-RS232-Adapter~ICUSB2324

and directly connect it to the Host PC.