RS-232 RS-485 Converter Model 485TBLED 485TBLED converts unb

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RS-232 RS-485 Converter Model 485TBLED 485TBLED converts unb

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Documentation Number 485TBLED3301
RS-232 RS-485 Converter
Model 485TBLED
485TBLED converts unbalanced, full-duplex RS-232 signals balanced, full half-duplex RS-422 RS-485 signals. RS-485 enhanced version RS-422 Standard. allows multiple drivers receivers two-wire four-wire system. RS-232 port, configured port, female DB25 connector with pins input), output), (Signal Ground) supported. Pins (RTS) (CTS) tied together, pins (DSR), (CD), (DTR) also tied together. Pins (Frame Ground) (Signal Ground) connected straight through RS-485 terminal blocks. RS-485 terminal blocks support Transmit Data (A-) (B+), Receive Data (A-) (B+), Frame Ground, Signal Ground, input. Schematic.
LEDs 485TBLED LEDs: Transmit Data show when RS-485 driver enabled Receive Data
showing data appearing RS-232 port. These very useful determining data getting through converter. Note that indicates that RS-485 driver enabled. Data must present RS-232 side data transmitted RS-485 side. data present, data will transmitted even though illuminated.
Flow Control
485TBLED uses different methods enable RS-485 driver, either toggling Request Send (pin RS-232 side, automatic sensing data Transmit Data (pin RS-232 side. This option user selectable setting push-on jumpers located next terminal blocks. Fig. Removing both sets jumpers completely also constantly enable RS-485 driver receiver. This makes 485TBLED like RS-422 converter.
Baud Rate
There timing component converter, resistor Fig. This component part automatic sensing circuit, affects baud rate which converter used two-wire setup. This component, Figure factory selected allow converter 9600 baud higher. With this component, RS-485 driver will shut approximately after last character been sent. need change 485TBLED baud rate other than 9600 baud, change this component. change baud rate, remove through hole component R14, Table Figure shows interconnect RS-485 converters using 4-Wire Wires.
Figure
Electronics Revised September 2001
This product designed manufactured domestic imported parts
Documentation Number 485TBLED3301
Echo jumper used two-wire mode, allows prevent data being sent from RS-232 port from being echoed back RS-232 port. receivers driven RS-485 driver, allowing together large systems with many drop points. using termination resistors, they should located opposite ends system. Proper operation RS-485 DECLARATION CONFORMITY system requires presence Manufacturer's Name: Electronics Manufacturing Company return path. RS-485 Standard P.O. 1040 recommends that third wire used Manufacturer's Address: Dayton Road this. safety, resistor Ottawa, 61350 should connected between Signal Model Number: 485TBLED Ground "reference wire" Description: RS-232 RS-485 Converter Type: Light industrial equipment every drop point. While Application Council Directive: 89/336/EEC possible interconnect Signal Standards: 50082-1:1998 Grounds directly, this 50082-1:1992 (-2, recommended danger 61000 (-2, circulating currents possibly being present.
Table
Resistor Replacement Changing Baud Rate Timeouts Baud Rate 1200 2400 4800 9600 19200 38400 57600 115200 Time (ms) 8.33 4.16 2.08 1.04 .520 .260 .176 .0868 Resistor R9/R14 (ohm) 820K 430K 200K 100K 8.2K
Michael Fahrion, Director Engineering wire type maximum length listed RS-485 Standard. However, RS-422 Standard (which very similar) recommends number 24AWG twisted pair telephone cable with shunt capacitance picofarads foot, more than 4000 feet distance.
Specifications:
Dimensions 2.14" 3.32" .725" (54.5 84.34 18.43mm) Supply Voltage Temp Range Data rates 115.2 kbps Connector DB25 Female RS-232 side
Electronics Revised September 2001
This product designed manufactured domestic imported parts

RS-232 RS-485 Converter Model 485TBLED 485TBLED converts unb

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