NBS-2 ISA Bus RS-485 Serial Interface Card

Description Documentation Create an RS-485 Serial Device Network The Cimetrics 9-bit products allow networking of serial devices - usually microcontrollers used in process instrumentation. For those who have been using Cimetrics 9-bit NBS products for years, the NBS-2 was the second RS-485 card developed for that product family. It marks more than twenty years of Cimetrics support for its 9-bit customers, and represents Cimetrics continued commitment to legacy support. RS485 networks are everywhere (still).http://en.wikipedia.org/wiki/EIA-485 Many users are not so much familiar with RS485 as the protocols which travel over this datalink. These protocols include Modbus RTU, BACnet MS/TP, ARCNET RS485, Johnson N2, Siemens P1, and Profibus. Some protocols make use of some UARTs' capabilities to manipulate the 9th bit in a character frame to allow these "9-bit" characters to be a special part of the signaling in the protocol. This is related to the use/concept of parity in characte