Originally Posted by
RCaffin
Hi Mmpie
The USB is an excellent thing for cameras and mice and keyboards on very short leads.
In an industrial environment with high-powered switching devices hammering away, the USB is a bit of a disaster. Some points to consider:
The USB signalling levels are about 3.3 V; the ethernet levels are +-15 V.
The USB is direct-connected, while the ethernet is transformer-coupled. Think ground loops and RFI!
The USB does not feature error detection and recovery; the ethernet has these built deep into the protocol.
Warp9 started off with the USB SS, but after a lot of complaints (including mine) to Greg, the owner, he switched to the ESS.
I was getting a crash once per day sometimes with the USB, I have not had a crash with the ESS over the last year or so.
You might want to reconsider the XBox. I use the keyboard.
The UCCNC devices use the USB, but I believe they have layered full error-detection and recovery onto the basic protocol. Still direct-coupled and only 3.3 V though.
Cheers
Roger