On my X200 VFD I ran into problems with common-mode noise. RS485's differential mode is highly effective at rejecting differential noise UNLESS you exceed the differential range of either transceiver's RX side, then it stops working, and there was a lot. So I got an optoisolating RS232-RS485 converter.
I'm not too happy with having a second cable for the VFD, my computer is located away from the control box with all that and I'd rather have one cable. That's a minor issue of coarse. I was fortunate in that I have a PC with a true RS232 DB9 on it that can be screwed in. The USB-serial link would be more of a deal-breaker because it doesn't physically lock. Danny ---- andy pugh <bodge...@gmail.com> wrote: > On 8 July 2016 at 07:53, Danny Miller <dan...@austin.rr.com> wrote: > There's a "UART" listed on the 7i92's features. Actually since I have a > hardware RS232/RS485 bridge I could still use that, if the config for it > has been made. But I don't know if it has. It is possible to use the hm2 UART module, and I have done. But it isn't easy. You currently need to write your own custom HAL component to encode and decode the byte meanings. To use hy_vfd it is _far_ easier to just buy a $2 USB-RS485 dongle and use that. Something like this: http://www.ebay.com/itm/112047282456 Though you may find one closer and faster with searching. It is possible to desolder the USB plug and fit a motherboard header so that you can mount it internally, if you want. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
