Please contact Technical Support more information. Four-Wire RS-4

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Documentation Number 485FWTW4698
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Four-Wire RS-422/485 Two-Wire RS-485 Converter
Model 485FWTW
485FWTW converts balanced half-duplex RS-422 RS-485 four-wire signals (separate lines) two-wire balanced half-duplex signals. RS-485 enhanced version RS-422 Balanced Line Standard. allows multiple drivers receivers two-wire system. four-wire RS-422/RS-485 port uses male DB25P type connector with pins Transmit Data, pins Receive Data. Protective Ground (pin Signal Ground (pin also connected. two-wire RS485 port 6-position terminal block with Data Data Signal Ground, Protective Ground, Volt power inputs. Termination resistors optional, depending line length, baud rate, etc. location optional termination resistor. resistors should about impedance line used, case should they less than ohms each. special software requirements needed since RS-485 driver enabled first transition RS-422/RS-485 Transmit Data (pin line. transition line keeps driver enabled preventing monostable multivibrator from timing out. transmitter disabled approximately after last transmitted character. This timeout allows continuous transmission data 9600 baud higher. timeout components. Figure shows where these components located. Contact Technical Support have questions changing timeout components. When converter transmitting data, receiver two-wire RS-485 side disabled. Figure also shows location which removed constantly enable RS-485 receiver. receivers driven generator. This allows together large systems with many drop points. termination resistors should located approximately opposite ends system. Proper operation RS-485 system requires presence signal return path. RS-485 Standard recommends that third wire used this. safety, watt resistor should connected between "reference" wire every drop point. While possible interconnect signal grounds (pin 7's) directly, this recommended danger circulating currents possibly being present. wire type maximum length listed RS-485 Standard. However, RS-422 Standard, which very similar, recommends number twisted-pair telephone cable with shunt capacitance picofarads foot more than 4000 distance. Table COMPONENT REPLACEMENTS CHANGING BAUD RATE TIMEOUTS Capacitor Baud Time Resistor Rate (ms) (R14) (C3) (ohm) (mfd) 33.3 330K 16.6 160K 1200 8.33 820K 0.01 2400 4.16 430K 0.01 4800 2.08 200K 0.01 9600 1.04 100K 0.01 19.2K 0.52 0.01 38.4K 0.26 0.01 57.6K 0.176 0.01 115.2K 0.0868 8.2K 0.01 Figure
Electronics Revised November 1998
This product designed manufactured domestic imported parts
Documentation Number 485FWTW4698
Please contact Technical Support more information.
Electronics Revised November 1998
This product designed manufactured domestic imported parts

Please contact Technical Support more information. Four-Wire RS-4

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