Can I use RS232 library for RS485 communication? Alternatively, can I use NI Serial with non-NI 485 boards?

Hi-
I have successfully used RS232 library to communicate with one RS485 device. I now have multiple devices using the same Rx and Tx lines. Three of the 4 devices have their own dll and can communicate effectively despite each other. My problem occurs when the one device I am talking to using the RS232 library now has to share the lines with the other devices. Are there any ways around this? All I can think of is to see if I can use the NI Serial library commands with my non-NI PCIe card. OR, buy the NI 485/422 card and use the NI Serial commands. Any other suggestions?
Thanks.

The fundamanetal difference between RS232 and RS485 is the ability to connect to multoiple devices. The devices also normally work in a "speak only when spoken to" mode and this is achieve by adding a device address in the protocol. The NI serial library is oblivious to most of this and doesn't care if it's RS232 or RS485. The problem with your 232 device is that it will speak everytime when any other device is adddressed, so you should make it comply to 485 standards. This can be done with RS232 to RS485 convertors. You can do a search on Google for this. The ones I use and have the least amount of problems with is either from Advantech (<http://www.advantech.com/products/search.aspx?keyword=RS-232#search> and <http://www.advantech.com/products/search.aspx?keyword=RS-232#search>) or BB Electronics. (<http://www.bb-elec.com/Products/Serial-Connectivity/Serial-Converters/Port-Powered-RS-232-to-RS-485-...>)
Best Regards
Jattie van der Linde
Engineering Manager, Software & Automation
TEL Magnetic Solutions Ltd

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