B&B Electronics 4WSD9OTB
Contents
1. 15 2 kbps Operating Temperature 32 158 F 0 70 C LED Indicators TD and RD 4WSD9OTB 9 8 x 4 3 x 2 3 cm 4WSD250TB 9 8 x 5 5 x 2 3 cm Approvals www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BSB ELEC TRONIC S European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 7924452. B amp B ELECTRONICS PRODUCT INFORMATION P 9150 RO01_4WSDxxOTB 0812ds p1 4 Models 4WSD90TB 4WSD250TB Isolated Universal Converters RS 232 4 wire RS 422 2 wire or 4 wire RS 485 CE Features v High Speed Communications Supports data rates up to 115 2 kbps v Extended communications Supports distances up to 4000 ft 1200 m v Removable terminal blocks for easy RS 422 RS 485 connections v Switchable modes Supports 2 wire RS 485 4 wire RS 485 and full duplex RS 422 v Automatic RS 485 driver control External software modifications are not required v 2000 VAC isolation Reliable in harsh electrical conditions Functional Description Isolates and converts RS 232 signals into RS 422 RS 485 signals and vice versa Unlike other converters external software is not required to control data flow The RS 232 input is wired for DCE and interfaced through a female DB25 or DB9 connector RS 422 or RS 485 signals are connected to a removable terminal block External power is applied to separate removable terminal block A 10 48 VDC power supply not included is required Ordering Information B www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BSB ELEC TRONIC S European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 792445 B amp B ELECTRONICS PRODUCT INFORMATION Oper
3. Select RS 485 mode in this situation e Biasing is provided by the end of line slave e Switch settings for this mode are Switch 1 RS 485 Switch 2 Echo On Switches 3 and 4 4 wire B www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BSB ELEC TRONICS European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 792445 B amp B ELECTRONICS PRODUCT INFORMATION P 9150 R001_4WSDxxOTB 0812ds p4 4 Figure 3 4 wire RS 422 TD A RD A e Used as the master in a master slave Tp B RD B circuit with receive only slaves e Full duplex communications RD A TD A e Requires a twisted pair for transmit a RD B TD B twisted pair for receive and a ground GND GND reference wire e Switch settings are Switch 1 RS 422 Switch 2 Echo On Switches 3 and 4 4 wire DECLARATION OF CONFORMITY Manufacturer s Name B amp B Electronics Manufacturing Company Manufacturer s Address P O Box 1040 707 Dayton Road Ottawa IL 61350 USA Model Number 4WSDxxOTB Description RS 422 485 Converter Type Light industrial ITE equipment Application of Council Directive 89 336 EEC Standards EN 55022 EN 61000 6 1 EN 61000 4 2 4 3 4 4 4 5 4 6 4 8 4 11 yP Michael J Fahrion Director of Engineering C B Specifications Connection Block Data Rate Up to 1
4. ation P 9150 R001_4WSDxxOTB 0812ds p2 4 Configure operating mode using guidance in Table 1 Common Applications are discussed in Figures 1 through 3 RS 232 connection requires RD TD and Signal Ground The remaining signals are looped back within the converter as shown in Table 2 In half duplex operation the receiver is enabled when not transmitting Echo Off In RS 422 mode the driver is always enabled In RS 485 mode the RS 485 driver is automatically enabled during each space state by the presence of an RS 232 signal When the RS 232 data is in a mark or idle state the RS 485 driver is disabled and the RS 485 data lines are held in a mark state by the bias provided by a 4 7K Q resistor The value of this resistor may need to be changed depending on the termination used Refer to B amp B Electronics RS 422 RS 485 Application Note for detailed information concerning RS 422 and RS 485 networks This document is available for download at http www bb elec com tech_articles The loopback test mode switch is used with hyper terminal to verify the operation of the converter Additional troubleshooting guidance is available at htip Awww bb elec com technical library asp Table 1 Operating Mode Switch Settings e ee ee ir ir Operating Medes Operating Mode half Pe netam R848 full duplex full duplex Loopback Test Mode B Used with HyperTerminal or another terminal program to confirm operation o
5. f data through converter Table 2 RS 232 Pin out 4WSD250TB 4WSDS90TB Loop back jumpers are pre wired within the converter www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BSB ELEC TRONIC S European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 792445 B amp B ELECTRONICS PRODUCT INFORMATION P 9150 R001_4WSDxxOTB 0812ds p3 4 Figure 1 2 Wire RS 485 e Used to connect several RS 485 devices with minimal wire TD A S e DATA A e Devices communicate one at a time TD B DATA B e Units are normally in receive mode RD A e When data is requested the RD B addressed device waits one delay GND time before responding e After transmitting the device reverts to receive e Switch settings are Switch 1 RS 485 Switch 2 Echo Off Switches 3 and 4 to 2 Wire Figure 2 4 Wire RS 485 RD A RD B TD A TD B GND e Used for 4 Wire Master Slave circuits e Each device is polled allowing faster response time e Addressed devices can receive while responding to a request e When used as a Master in a single RD A RD B GND master system Switch 1 may be RD A set RS 422 since it is the only a i TD A transmitter ise e When used as a slave the RS 232 GND device must provide addressability
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