Optically Isolated RS-232 RS-485 Converter Model 485OICR Mod

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Optically Isolated RS-232 RS-485 Converter Model 485OICR Mod

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Document 485OICR4300
Optically Isolated RS-232 RS-485 Converter
Model 485OICR
Model 485OICR converts unbalanced, full half-duplex RS-232 signals optically isolated, balanced, full half-duplex RS-422 RS-485 signals baud rates 38400 bps. RS-485 enhanced version RS-422 Standard. allows multiple drivers receivers two-wire system. RS-232 port female DB25 connector with pins 2(TD), 3(RD), 7(Signal Ground) supported. Pins 4(RTS) 5(CTS) tied together, pins 6(DSR), 8(CD), 20(DTR) also tied together. These handshake lines provide power RS-232 side isolator. have port that cannot supply these pins, they cannot provide enough power, power supply connected DB-25 connector pins 25(+) 12(-) power RS-232 side converter. Terminal blocks provided Transmit Data (B), Receive Data (B), RS-485 power ground shown Figure Note that RS-485 Ground terminal block connection RS-485 Signal Ground well RS-485 power ground. Figure shows connect converter two-wire four-wire system. resistors (labeled converter) termination resistors that should only used when very long cable runs used high baud rates. installed, resistors should equal characteristic impedance line used, normally about ohms. Refer B&B's RS-422/485 Application Note more information termination biasing. 485OICR enables RS-485 driver automatic sensing data Transmit Data (pin RS-232 side. 485OICR jumpers located adjacent terminal blocks. enables either RS-422 RS-485 mode. Placing shorting position enables RS-485 mode, removing jumper switches RS-422 mode. used wire connections, preventing data being sent from RS-232 port from being echoed back RS-232 port. Placing shorting position will prevent data from echoing. Removing jumper will hold receiver enabled. Refer Table typical jumper settings. There internal components, resistor capacitor which control timing automatic send data circuit. These components factory selected allow converter 9600 baud higher, disabling RS-485 driver after last character been sent. change baud rate lower than 9600 baud, configure 485OICR specific baud rate, these component values need changed. surface mount construction converter, space through-hole components been provided opposite side PCBD These through-hole components electrically parallel with change baud rate other than 9600, remove select proper values baud rate from Table install them spaces labeled C14. receivers driven RS-485 driver, allowing together large systems with many drop points. wire type maximum length listed RS485 Standard. However, RS-422 Standard (which very similar) recommends number 24AWG twisted pair telephone cable with shunt capacitance picofarads foot, more than 4000 feet long. Proper operation RS-485 system requires presence return path. RS-485 Standard recommends that third wire used this.
DECLARATION CONFORMITY
Electronics Manufacturing Company P.O. 1040 Dayton Road Ottawa, 61350 Model Numbers: 485OICR Description: RS-232/485 Optically Isolated Converter Type: Light industrial equipment Application Council Directive: 89/336/EEC Standards: 50082-1 (IEC 801-2, 801-3, 801-4) 50081-1 55022, 1000-4-2) 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11) 50204 55024 Manufacturer's Name: Manufacturer's Address:
Figure Timing Component Locations
Table Baud Rate 1200 2400 4800 9600 19200 38400
Timing Component Values Time (ms) (µF) 33.0 330K 16.0 160K 820K 0.01 430K 0.01 200K 0.01 1.04 100K 0.01 0.01 0.01
Table Jumper Settings RS-422 RS-485 2-wire RS-485 4-wire
Michael Fahrion, Director Engineering
Electronics 1993 Revised November 2000
This product designed manufactured domestic imported parts
Document 485OICR4300 Figure
Specifications Transmission Mode: Data Rate: Connectors: RS-485 Enable Control: RS-485 Enable Timeout: RS-232 Power Requirements: RS-232 External Power Connections: RS-485 Power Requirements: RS-485 Power Connections: Isolation: Dimensions:
Full half duplex asynchronous 38.4K RS-232, DB25 Female; RS-485, Terminal Blocks Automatic Hardware Control Presence Data Factory preset Port powered max. DB25 pins max. Terminal Blocks 1500 VRMS minute 3.3"L 2.2"W 0.67"H (8.4
Electronics 1993 Revised November 2000
This product designed manufactured domestic imported parts

Optically Isolated RS-232 RS-485 Converter Model 485OICR Mod

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