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

 

don't see much of RS422 at all these days.

can't say I have ever even seen a 4 wire RS485 device.

 

>In this year of 2015, how common are 4-wire RS-485/422 devices?

Like you I'm a bit rusty, I haven't seen any 4 wire systems for a while, you would think they would be faster.

BTW you can monitor the traffic using a laptop with RS232 connected to the negative wire of the pair, it's very handy when first setting the parameters.