Black Box IC477A-F-R2 User's Manual
Contents
1. 3 2 DIP Switch Configuration The eight positions on switch set SI shown in the first illustration below configure the Converter for RTS CTS delay used in 2 wire half duplex mode only echo mode used in 2 wire half duplex mode only method of carrier control transmit off impedance receive impedance and 2 wire 4 wire operation These switches are located internally on the underside of the Converter s PC board To access switch set S1 use a small flat blade screwdriver to pop open the Converter s case as shown below CHAPTER 3 Configuration 3 2 1 DIP SWITCH SETTINGS The factory default settings for the switches are presented below Read the information following the table for an explanation of the switch s function Switch 1 Summary Table Function Factory Default S1 1 Transmit Off Impedance Off High Z Transmit Off Impedance Off n 8 msec O Echo Off Carrier Control Controlled by RTS Receive Impedance n 120 ohm S1 7 2 wire 4 wire 2 wire On On S1 8 2 wire 4 wire Note Switches S1 1 and S1 2 should be switched simultaneously Switches S1 7 and S1 8 should also be switched simultaneously S1 1 and S1 2 Transmit Off Impedance Switches S1 1 and S1 2 are set together to determine whether the receiving device sees the impedance of the Converter s transmitter as being high or intermediate when the transmitter is turned off The intermediate2. setting is useful in half duplex environments where the receiving device does not respond well to the high setting S1 2 Setting On On Intermediate Impedance Off Off High Impedance S1 3 RTS CTS Delay The setting for switch S1 3 determines the amount of delay between the time the Converter sees RTS and when it sends CTS Note RTS CTS Delay setting should be based upon transmission timing S1 3 Setting On 8 msec Off No delay nn ASYNC 232 lt gt 422 485 CONVERTER S1 4 Echo Mode The setting for switch S1 4 determines whether the Converter echoes data back to the transmitting device half duplex mode only S 1 4 Setting On Echo On Off Echo Off S1 5 Carrier Control Method The setting for switch S1 5 determines whether the carrier is Constantly On or Controlled by RTS This setting allows for operation in switched carrier multipoint or hardware handshaking applications S1 5 Setting On Controlled by RTS Off Constantly On NOTE Carrier is ON when RTS is asserted positive and OFF only when RTS is driven to a negative voltage S1 6 Receive Impedance Termination The setting for switch S1 6 selects the impedance of the input receiver You may select either a low impedance of 120 ohms or a high impedance of 16K ohms By selecting the proper impedance for each drop there may be up to 31 receivers in one application S1 6 Setting On Low 120 ohms Off High 16
3. Pin Configurations DIRECTION STANDARD DCE SETTING DIRECTION 1 FG Frame Ground 2 TD Transmit Data To Converter 3 RD Receive Data FromConverter 4 RTS Request to Send To Converter 5 CTS Clear to Send FromConverter 6 DSR Data Set Ready FromConverter To Converter Data Term Ready DTR 20 AO odie ope 8 DCD Data Carrier Detect From Converter DIRECTION STANDARD DTE SETTING DIRECTION 1 FG Frame Ground 2 TD Transmit Data From Converter 3 RD Receive Data To Converter 4 RTS Request to Send From Converter 5 CTS Clear to Send To Converter 6 DSR Data Set Ready To Converter 7 SG Signal Ground 8 DCD Data Carrier Detect To Converter From Converter Data Term Ready DTR 20 ASYNC 232 lt gt 422 485 CONVERTER Appendix B 422 485 530 Pin Configuration The pinout below applies to models IC477A F R2 IC477A M R2 1C478A F R2 1C478A M R2 Pin Number Pin Name 2 gt TXA positive 3 gt RXA positive 14 TXB negative 16 RXB negative 4 RTS A positive 5 o CTS A positive 6 DCE Ready A positive 8 Rev Line Signal Detect A positive 10 Rev Line Signal Detect B negative 13 CTS B negative p 19 RTS B negative 20 DTE Ready A positive 22 DCE Ready B negative 29 DTE Ready B negative Has internal function as well as being looped to the associated pin in the diagram Appendix C Self Test 1 To perform a self tes
4. This chapter tells you how to properly connect the Converter to the RS 485 and RS 232 interfaces 4 1 Connection to the RS 485 Interface To function properly the unit must have one or two twisted pairs of metallic wire These pairs must be dry unconditioned metallic wire between 19 and 26 AWG solid copper core not stranded Note that the higher number gauges may limit distance somewhat and unshielded produces better results than shielded The Converter is available with several different physical interfaces on the RS 485 side DB25 following the RS 530 standard and terminal blocks with strain relief 4 1 1 4 WIRE CONNECTION USING THE DB25 1C477A X R2 AND IC478A X R2 The DB25 connector on the Converter s RS 485 side conforms to the RS 530 interface standard When connecting to an RS 485 device that also conforms to the RS 530 standard your cable should be crossed over in the manner shown below Converter RS 485 530 Device Signal DB25 Pin DB25 Pin Signal XMTA A P E E 3 RCVA XMTB Apio iio aolccon 16 RCVB RCVA ST 2 XMTA RCVB A 14 XMTB NOTES 1 In the pinout above A means positive and B means negative 3 CHAPTER 4 Installation 2 It is not necessary that the RS 485 device adhere to the RS 530 standard However you must make sure that the signals polarities and pairing of your connection conform to this table 3 If you are not using two IC477A X R2s or 1C478A X R2s back to back a
5. ser seguidas 5 El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El parato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado 9 El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n 10 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor gt ASYNC 232 lt gt 422 485 CONVERTER 11 12 13 14 15 16 17 18 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato Precauci n debe ser tomada de tal manera que la tierra fisica y la po
6. 8 m 4 3 Wiring for Multipoint Applications The Converter supports multipoint applications using daisychain topology Using a daisychain topology you may connect several Converters together in a master slave arrangement Maximum distance between the units will vary based upon the number of drops data rate wire gauge etc The illustration below shows how to wire the two pair 4 wire cables properly for a daisychain topology Note that the ground connection is not needed RCVB TROVA SLAVE N XMT B p LXMT A NOTE Connections are to screw terminals directly on the Converter MA ASYNC 232 lt gt 422 485 CONVERTER 4 4 Operation Once the Converter is properly installed it should operate transparently as if it were a standard cable connection Operating power is derived from the RS 232 data and control signals there is no ON OFF switch All data signals from the RS 232 and RS 485 interfaces are passed straight through Additionally in DCE mode a Transmitter ON signal received at the RS 422 485 RCV connection will cause DCD output at the RS 232 connector to assert HIGH In DTE mode a Transmitter ON signal at the RS 422 485 RCV connection causes RTS output at the RS 232 connector to go HIGH Therefore one hardware signal in either DTE or DCE mode is virtually passed through the Converter in the direction of RS 422 485 IN to RS 232 OUT APPENDIX A RS 232C Pin Configurations Appendix A RS 232C
7. Connection to the RS 485 Interface 14 4 1 1 4 Wire Connection Using the DB25 IC477A or 78A X R2 14 4 1 2 4 Wire Connection Using Terminal Blocks 1C476A X R2 15 4 1 3 2 Wire CONNECHION 0 ccc ec ececececececececscecececececececececececesesaces 18 4 2 Connection to the RS 232 Interface 19 4 3 Wiring tor Multipoint Applications 19 L RO ET E E E ee 0 20 Appendix A RS 232C Pin Configurations 1 0 0 0 eee eeeeeeeeeeeeeeeeeeeeeeeeeeees 21 Appendix B 422 485 530 Pin Configuration ss 22 APPENA O SETS dt a meen er 29 CHAPTER 1 Specifications Data Rate Connectors Transmission Format Transmission Line Transmission Mode Range Control Signals Carrier Surge Protection RTS CTS Delay MTBF Operating Temperature nn B 1 Specifications Up to 115 200 bps IC476A F R2 1 Female DB25 1 Terminal block IC476A M R2 1 Male DB25 1 Terminal block IC477A F R2 2 Female DB25s IC477A M R2 1 Female DB25 1 Male DB25 1C478A F R2 1 Male DB25 1 Female DB25 IC478A M R2 2 Male DB25s Asynchronous 2 or 4 wire unconditioned unshielded solid copper core twisted pair 4 wire full or half duplex 2 wire half duplex Up to 9 miles 14 5 km depending on baud rate and type of cable DSR turns ON immediately after the terminal raises DTR DCD turns ON after recognizing the receive signal input on the RS 422 interface CTS turns ON afte
8. K ohms typical S1 7 and S1 8 2 wire 4 wire Modes Switches S1 7 and S1 8 are set together to determine whether the Converter is in 2 wire or 4 wire operating mode Note 2 wire mode is half duplex only S1 7 S1 8 Setting On On 2 wire mode Off Off 4 wire mode CHAPTER 3 Configuration 3 2 2 CONFIGURATION SWITCH APPLICATIONS The table below shows you how to set the Converter s switch to fit several common applications Do not change switch settings until you have carefully read this manual If you have any questions about the proper settings for your application call your supplier for technical support vical Switch Applications ar Point to Point Sy a at rer ony era on on fon for fon 1 S1 5 Master Off Rev Impedance S1 6 Master On Slaves Off Last Slave On 3 2 3 WHEN YOU RE FINISHED CONFIGURING Once you ve finished setting the Converter s configuration switches don t snap the case halves back together yet If you are connecting the RS 485 interface using the internal terminal blocks go to Section 4 1 2 and continue the installation procedure If you are connecting the RS 485 interface using DB25 go ahead and snap the case halves back together now Don t force a fit make sure all the pieces are properly set before snapping the case halves shut 4 Installation Once you have properly set the configuration switches you are ready to connect the Converter to your system
9. LN i lt 7 Wee SSS FEBRUARY 1998 1C476A F R2 1C477A M R2 1C478A F R2 IC476A M R2 1C477A F R2 IC478A M R2 Async 232 lt gt 422 485 Converter SS O O SSS O SS ES SS SS ES SS SS SS A AA A A CUSTOMER Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com ASYNC 232 lt gt 422 485 CONVERTER FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate radio frequency energy and 1f not installed and used properly that 1s in strict accordance with the manufacturer s instructions may cause interference to radio communication It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifi
10. cations not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of the Canadian Department of Communications Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la classe prescrites dans le R glement sur le brouillage radio lectrique publi par le minist re des Communications du Canada CE NOTICE The CE symbol on your Async 232422 485 Converter indicates that it is in compliance with the Electromagnetic Compatibility EMC directive and the Low Voltage Directive LVD of the Union European EU TRADEMARKS USED IN THIS MANUAL All applied for and registered trademarks are the property of their respective owners nn ASYNC 232 lt gt 422 485 CONVERTER NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado 2 Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura 3 Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas 4 Todas las instrucciones de operaci n y uso deben
11. dle washer then insert the captive screw with the washer on it through the hole in the DB25 end of the case Snap that side of the case closed Repeat the process for the other side Cable installation is complete 4 1 3 2 WIRE CONNECTION Some RS 485 devices employ a two wire half duplex configuration When using this configuration be sure to first set the Converter to two wire mode then use only the transmit XMT pair as shown below Converter Signal RS 485 Signal PN PRE citada positive PANS sista ne negative IMPORTANT If you are not using two IC476A X R2s back to back and the procedure on the previous page produces garbage data or none at all flip the A and B leads at one end of the 485 connection The wiring pattern above applies regardless of whether you are making the RS 485 connection via DB25 or terminal blocks For specific wiring instructions refer to the beginning of this chapter 1 CHAPTER 4 Installation 4 2 Connection to the RS 232 Interface Once you have properly configured the Converter and connected the twisted pair wires correctly simply plug the Converter directly into the DB25 port of the RS 232 device After doing so remember to insert and tighten the two captive connector screws NOTE If you must use a cable to connect the Converter to the RS 232 device make sure it is a straight through cable of the shortest possible length We recommend no more than 6 ft 1
12. elief or DB25 male or female depending on the model Silicon Avalanche Diodes provide 600 watts per wire of protection against harmful data line transient surges ASYNC 232 lt gt 422 485 CONVERTER 3 Configuration The Async 232 lt gt 422 485 Converter is configured using an eight position DIP switch and a DTE DCE switch The figure below shows the DTE DCE switch location along with the location of the terminal block DTE DCE Switch Terminal Block RCV G XMT The illustration at the top of the next page shows the location of the eight position DIP switch on the underside of the Converter s PC board CHAPTER 3 Configuration DIP Switch S1 3 1 Setting the DTE DCE Switch For your convenience the 1C476A X R2 Converter has an externally accessible D TE DCE switch see the diagram on the previous page To access the DTE DCE switch on the 1C477A X R2 and 1C478A X R2 remove the plastic shells as illustrated on the next page If the device connected to the Converter is a modem or multiplexor or 1s wired like one set the switch to DTE The setting causes the Converter to behave like Data Terminal Equipment and transmit data on pin 2 If the device connected to the Converter is a PC terminal or host computer or is wired like one set the switch to DCE This setting causes the Converter to behave like Data Communications Equipment and transmit data on pin 3 ASYNC 232 lt gt 422 485 CONVERTER
13. larizaci n del equipo no sea eliminada Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los contactos y recept culos donde salen del aparato El equio el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante En caso de existir una antena externa deber ser localizada lejos de las lineas de energia El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido da ado u B Objectos han ca do o l quido ha sido derramado dentro del aparato O O El aparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempe o o E El aparato ha sido tirado o su cubierta ha sido da ada ASYNC 232 lt gt 422 485 CONVERTER Contents PECAR 5 2 13 UNE 8 LD LOI COL PS eE ANTAS ores 7 CO A AEE a E A N T O nectvcn ane eaee inser ces 8 3 1 Setting the D POS E a en 9 Saa o AAN SO 10 2 2 DISCS I a iaiia 11 3 2 2 Configuration Switch Applications 13 3 2 3 When You re Finished Configuring 13 Ms SS REEN EEN NASER 14 4 1
14. nd the procedure on the previous page produces garbage data or none at all flip the A and B leads at one end of the 485 connection 4 1 2 4 WIRE CONNECTION USING TERMINAL BLOCKS IC476A X R2 If your RS 485 application requires you to connect two pairs of bare wires to the Converter you will need to open the case to access the terminal blocks The following instructions tell you how to connect the bare wires to the terminal blocks and fasten the strain relief collar in place so that the wires won t pull loose 1 You should already have the case open for the configuration procedure If not open the case as described in Section 3 2 2 Strip the outer insulation from the twisted pairs about one inch from the end 3 Strip back the insulation on each of the two twisted pair wires about one eighth of an inch 4 Connect one pair of wires to XMT and XMT on the terminal block making careful note of which color is positive and which color is negative OS ES ASYNC 232 lt gt 422 485 CONVERTER 5 Connect the other pair of wires to RCV and RCV on the terminal block again making careful note of which color is positive and which color is negative NOTE Positive and negative are relative terms and may not always have the same relationship for all RS 422 or RS 485 devices see the previous note regarding flipping the leads Ultimately you will want to construct a two pair crossover cable that makes a co
15. nnection with the RS 485 device as shown below Converter RS 485 Device XMT A eee Rieke Ree Meee a e RCVA One pair ANTE E RCVB 7 A To Shield Optional G A tonne EA EA ENE XMTB One pan CE EI XMTA IMPORTANT If you are not using two IC476A X R2s back to back and the procedure on the previous page produces garbage data or none at all flip the A and B leads at one end of the 485 connection 6 If there is a shield around the twisted pair cable it may be connected to G on the terminal block To avoid ground loops we recommend connecting the shield at the computer end only A ground wire is not necessary for proper operation of the Converter 7 When you finish connecting the wires to the terminal block the assembly should resemble the diagram at the top of the next page 6 CHAPTER 4 Installation 8 Place the two halves of the strain relief assembly on either side of the twisted pair wire and press together very lightly Slide the assembly so that it is about two inches 5 1 cm from the terminal posts and press together firmly 9 Insert the strain relief assembly with the wire going through it into the slot in the bottom half of the modem case and set it into the recess in the case ASYNC 232 lt gt 422 485 CONVERTER 10 Bend the top half of the case as necessary to place it over the strain relief assembly Do not snap the case together yet 11 Insert one captive screw through a sad
16. r the terminal raises RTS Strap selected either continuous or switched operation controlled by RTS 600 watts power dissipation at 1 msec 8 msec or no delay 239 906 hours 32 to 122 F 0 to 50 C ASYNC 232 lt gt 422 485 CONVERTER Humidity Altitude Power Size Shipping Weight 5 to 95 noncondensing Up to 10 000 feet 3048 m Draws operating power from RS 232 data and control signals no AC power or batteries required 2 7 H x 2 1 W x 0 7 D 6 9 x 5 3 x 1 8 cm lt 1 Ib lt 0 5 kg CHAPTER 2 Introduction 2 Introduction The Async 232 lt 422 485 Converter provides exceptional versatility in a compact package Requiring no AC power or batteries for operation the Converter supports asynchronous data rates up to 115 2 Kbps over one or two unconditioned unshielded solid copper core twisted pair The Converter passes one control signal in each direction see explanation in Section 4 4 and can handle up to 31 terminal drops in a multipoint polling environment The Converter may be configured for high or low impedance operation carrier may be set to constantly on or controlled by RTS and the unit can operate with or without echo half duplex mode RTS CTS delay may be set for no delay or 8 milliseconds The Converters can be ordered with either male or female DB25 connectors for RS 232 For RS 485 530 connections you can order either terminal block with strain r
17. t functionality test of the units set the 8 position DIP switch for 4W point to point operation see the chart in Section 3 2 2 2 Using two short pieces of twisted pair cable connect one wire between XMT and RCV Connect the other wire between XMT and RCV 3 Send data from the RS 232 device Whatever you send out you should receive back 4 If you receive nothing back a there s not enough or any power to the Converter The Converter requires at least 6 VDC under load Or b one or both of the twisted pair cables is bad Or c the Converter s DTE DCE switch is in the wrong position Or d the Converter is defective 5 If you receive the data back but it is garbled flip the and connections on the RCV connection If that does not resolve the problem make sure that sufficient voltage is being supplied by the RS 232 interface see 4a above 6 If you receive back what you sent the Converter is working properly lt BLACK BOX Copyright 1998 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 e 724 746 5500 e Fax 724 746 0746
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