Two Wire Operation of Models 1004A, 1009, 2085 and 2089?
Posted by Bob Puckett, Last modified by Danny Staub on 15 November 2017 03:45 PM
 For Half-Duplex 2-wire operation, Please confirm that the communications program being used by the computers controls Request To Send (RTS). This is very important, when a Converter detects an ON (+ voltage) for RTS the transmitter is switched from HIGH IMPEDANCE to LOW IMPEDANCE. If two or more Computers have RTS - ON the line will be clamped and there will be NO TRANSMISSION possible. The Converters operates HALF-DUPLEX only when they are configured for 2-wire operation. For Half-Duplex operation all Computers must have RTS-OFF, a negative voltage for RTS. Typical Half Duplex communications will function as follows : A Master unit will Poll with addresses of slave units. The Master unit turns ON RTS sends the address of a slave unit, then turn RTS OFF. The Slave unit receives it’s address, turns ON RTS sends the information then turns OFF RTS. Please use the following configuration switch settings for 2-wire operation of the Model 1004A and 2085 S1-1, 2, 3 and 4 OFF S1-5 ON for RTS control S1-6 one unit ON the other OFF S1-7, and 8 ON for 2-wire operation. Please use the following configuration switch settings for 2-wire operation of the Model 1008 and 2089 S1-1, 2 and 3 ON S1-4 OFF S2-1 and 2 ON S2-3 and 4 OFF The 2-wire twisted pair circuit should be connected: XMT+ ---- XMT+ XMT- ---- XMT-
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