On Wed, Oct 12, 2016 at 8:18 AM, jim stephens <jwsm...@jwsss.com> wrote:
> I found an Allen Bradley box which uses this, not sure if it needs a hub, > but points to the use of the hardware. > > Allen-Bradley-Data-Highway-Communication-Interface-1770-KF2-Ser-B-Rev-D-/ > > http://www.ebay.com/itm/391591793086 > > Data Highway brings back memories that aren't that old really. Its an industrial communications network produced by Allen Bradley. I've used it mostly for what would be called a machine cell: HMI connected to a machine controller and then some ancillary equipment. It was 156k bps (there were other speeds too depending on cable length), token passing, multi-drop network over shielded twisted pair. The 1770-KF2 is sort of AUI for Data Highway. It allowed a computer or PLC with a serial port to communicate on the network. I remember the Pyramid Integrator advertisements that include VAX connections. PLC programming software was offered for VMS. That was all too high end for the industries we were involved in. We used Compaq Portable 3 with 1784-KT cards in the 3 slot ISA box that plugged on the back. Data Highway was still reasonably current with Rockwell until ethernet became dirt cheap and ubiquitous. -chuck
