The Datacon Master-renovation of a Datacon field bus communications system for accelerator control

The Datacon Master (V110) is a custom-designed VME-bus SEC event driven serial communications engine featuring a superscaler RISC 32-bit Intel i960 CPU. The V110 and a commercial VMEbus host CPU running vxWorks with an Ethernet LAN connecting UNIX workstation consoles, make up the real time control system. Five V110 and three host CPUs will replace and upgrade PDP10 and PDP8 Datacon AGS front end computers. Five V110s will support twenty Datacon field busses with some 2600 devices. The V110 firmware is written in C. An accelerator event time link interface and μS timestamp are built-in. Each Datacon field bus supports up to 256 devices on a multidrop RG62A/U coaxial cable with up to 2000 feet between repeaters. Each V110 drives up to four full Datacon field busses at 1 MHz bandwidth