Series 2000 Communications Handbook - Soliton

Digital Communications HardwareSeries 2000 Communications Handbook2.11. LARGE RS422/485 NETWORKSNetworks with more than 32 instruments will require buffering of the communication lines.The KD485-ADE 422-422, Universal Serial Interface unit is recommended for this purpose.The KD485 in this format sets the Transmit line's to non tristate.NOTE Large networks using RS422 4-wire controllers could use type 261 Universal SerialInterface Unit. To set the transmit lines to non tristate in 261, change links 4 and 5 fromposition B to A.Contact your supplier for further information when specifying large networks .Instruments on a RS422/485 communication network should be chain connected and not starconnected.The diagram below illustrates the wiring of a network for communicating with a largenumber of 2000 Series controllers.2-14 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00