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In this year of 2015, how common are 4-wire RS-485/422 devices?
I know it was fairly common back in the 1990's, but I have been out of this 485 loop for a decade. Now it seems most products are 2-wire only, and the few I've seen which are still 4-wire seem to have unusual loop-back or repeating behaviors which make then not quite standard anyway. What have others seen out in the market place?
Thanks
- Lynn A Linse; cradlepoint.com
I know it was fairly common back in the 1990's, but I have been out of this 485 loop for a decade. Now it seems most products are 2-wire only, and the few I've seen which are still 4-wire seem to have unusual loop-back or repeating behaviors which make then not quite standard anyway. What have others seen out in the market place?
Thanks
- Lynn A Linse; cradlepoint.com