Async RS-232 to RS-485 Interface Converter with Opto
Contents
1. 7 Figure A 2 Null Modem Pinning RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION RJ 45 Signal A eaten N C D debated ia pants amit GND Gem Lr abe G aA a tant RCV dat XMT Dr Re adem aa XMT eo RCV Ge eters eee ease ae sde GND Gisisehedaedntes hredi imoR Eh N C Connection to ground is optional Figure A 2 RS 485 Pin Orientation lt BLACK BOX Copyright 1999 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 e Fax 724 746 07462. TB 5 RCV XMT TB 4 RCV RCV TB 1 XMT RCV TB 2 XMT RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 4 1 4 2 WIRE CONNECTION USING TERMINAL BLOCKS Most RS 485 devices employ a two wire hal duplex configuration When using this configuration be sure to first set the IC525A F or IC525A M to half duplex mode by switching DIP switches and jumpers refer to Chapter 3 for this configuration then use only the transmit XMT pair as shown below Converter Signal RS 485 Signal XMT 22 2 eee ee Midis sce 4 2 Daisychain Topology The Converter supports multipoint applications using a daisychain topology Using a daisychain topology you can 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 Figure 4 6 shows how to wire the two pair cables properly for a Converter daisychain topology CHAPTER 4 Installation NOTE The ground connection is not needed Host First Slave Other Slave s XMT RCV RCV XMT sense ceerecnt ss ACV erer tsetse RCV ACs eli copie sete MMT Seis XMT ACVis Shee aa a 42 XMT sis ai XMT Figure 4 6 Daisychain Wiring for Converter Host and Slaves NOTE This unit can be configured for line termination If termination is required a resistor will have to be externally connected 4 3 Connection to the RS 232 Interface
3. supports asynchronous RS 232 data rates up to 115 2 kbps over one or two unconditioned twisted pairs The Converter can handle up to 32 terminal drops in a multipoint polling environment You can set carrier to controlled by RTS or controlled by DTR and the unit operates without echo 66 constantly on The Converter uses a male or female DB25 connector for the RS 232 connection Options for twisted pair include RJ 11 RJ 45 or terminal block connectors 2500 Vrms optical isolators provide isolation between the RS 232 and RS 485 interfaces 2 2 Features e Operates asynchronously point to point or multipoint over 2 or 4 wires CHAPTER 2 Introduction e Up to 32 multipoint device drops in a polling environment e Data rates to 115 2 kbps e Passes transmit and receive data e Operates via 5 V power supply e Operates without echo 6 e Driver controlled as constantly on controlled by RTS or controlled by DTR e Compact size 0 8 H x 2 1 W x 3 8 D 2 x 5 3 x 9 7 cm e Twisted pair connection via strain relief RJ 11 or RJ 45 e 2500 Vrms optical isolation RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 3 Configuration You can configure the Converter via a four position DIP switch and two jumpers Figure 3 1 shows the location of the DIP switch and the two headers on the board DIP Switch JP4 Ja OF 1234 Figure 3 1 Location of t
4. when Switch S2 is ON 2 Setting ON DTR controls the transmitter OFF DTR control is OFF SwiTcH S3 RESERVED Switch S3 is reserved for future use and must remain OFF SWITCH S4 TRANSMITTER CONTROL When Switch S4 is OFF the input of RTS or DTR controls whether the unit can send data based on the configuration of Switches S1 and S2 In this setting and when the appropriate signal is high the Converter can transmit data from the RS 232 port to the RS 485 port When S4 is ON the Converter s transmitter is always enabled RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 4 Setting ON Constant Transmitter OFF Transmitter is controlled by RTS or DTR 3 2 Jumpers Jumper straps JP3 and JP4 control two wire four wire and half duplex full duplex operation respectively Table 3 3 Interface Card Strap Summary Strap Function ON OFF JP3A 2 wire 4 wire mode 2 wire 4 wire JP3B 2 wire 4 wire mode 2 wire 4 wire JP4A half or full duplex Half duplex Full duplex JP4B Impedance 120 ohms 12K ohms terminate unterminate Default settings CHAPTER 4 Installation 4 Installation Once you have properly set the configuration switches and jumpers you are ready to connect the Converter to your system This section explains how to properly connect the Converter to the RS 485 and RS 232 interfaces and how to operate the Converter 4 1 Connection to the RS 485 Interface To function prope
5. J 45 17 4 1 3 4 Wire Connection Using Terminal Blocks irine SR ees be 17 4 1 4 2 Wire Connection Using Terminal Bloks 20d 20 4 2 Daisychain Topology oo oooo o o 20 4 3 Connection to the RS 232 Interface 21 4 4 Operating the Converter 22 Appendix RS 232 Pin Configurations 23 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 1 Specifications Distance Up to 4000 ft 1219 2 m Interface RS 232 is DCE Operation 4 wire full or hal duplex 2 wire half duplex Speed Up to 115 2 kbps Transmission Format Asynchronous Optical Isolation 2500 Vrms RS 232 Interface DB25 female RS 422 485 Interface Options RJ 45 or terminal block Connectors IC525A F 1 DB25 female 1 terminal block with strain relief IC525A M 1 DB25 male 1 terminal block with strain relief IC526A F 1 DB25 female 1 RJ 45 1C526A M 1 DB25 male 1 RJ 45 Temperature 32 to 122 F 0 to 50 C Humidity 5 to 95 non condensing CHAPTER 1 Specifications Power External power adapter 5 VDC 300 mA AE models accept 220 volt input power Size 0 8 H x 2 1 W x 3 8 D 2 x 5 3 x 9 7 cm RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 2 Introduction 2 1 Description The Async RS 232 to RS 485 Interface Converter with Opto Isolation provides exceptional versatility in a compact package The Converter comes with an external AC power adapter and
6. 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 DTE device 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 6 ft 1 8 m or less If you are connecting it to a DCE device such as a modem or a mux a cross over null modem cable is required See Appendix A for pinning of a null modem cable RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION 4 4 Operating the Converter 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 APPENDIX Appendix Pin Configurations Direction DCE Female Setting Direction 8 DCD Data Carrier Detect From Converter 7 SG Signal Ground 6 DSR Data Set Ready 5 CTS Clear to Send 4 RTS Request to Send 3 RD Receive Data 2 TD Transmit Data 1 FG Frame Ground To Converter Data Terminal Ready DTR 20 Figure A 1 RS 232 Pin Configuration Doc eses 3 Buses ave sb out ees 2 A eee Se gale eee Ens 5 E EE EE 4 6 8 20 20 6 8 7
7. W BLACK BOX tenes NOVEMBER 1999 1C525A F IC525AE F 1C525A M IC525AE M 1C526A F IC526AE F 1C526A M IC526AE M Async RS 232 to RS 485 Interface Converter with Opto Isolation CUSTOMER SUPPORT INFORMATION Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate radio frequency energy and if not installed and used properly that is 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 modifications not
8. at the wires won t pull loose 1 If the case is not already open open it now by twisting it open with a small plastic screwdriver 2 Strip the outer insulation from the twisted pairs about one inch from the end as shown in Figure 4 3 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION E RR Figure 4 3 Stripping the Outer Insulation from the Twisted Pairs 3 Strip back the insulation on each of the 2 twisted pair wires about 4 inch as shown in Figure 4 4 ee Figure 4 4 Stripping the Insulation on the 2 Twisted Pairs 4 Place the cable through the end plate and make a small loop in the cable and feed the cable under the tie wrap which is currently installed in the board When you have completed this assembly it should resemble the diagram shown in Figure 4 5 Connect one pair of wires to XMT and XMT transmit positive and negative on the terminal block making careful note of which color is positive and which color is negative CHAPTER 4 Installation Bees TAT Figure 4 5 Completed Strain Relief Assembly 5 Connect the other pair of wires to RCV and RCV receive positive and negative on both of the terminal blocks again making careful note of which color is positive and which is negative Ultimately you will want to construct a two pair cross over cable that makes a connection with the RS 422 485 device as shown below 1C525A 6A RS 422 485 Device Signal Terminal Block Signal XMT
9. 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 Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de classe A prescrites dans le Reglement sur le brouillage radio lectrique publi par Industrie Canada The CE symbol on your equipment indicates that it complies with the Electromagnetic Compatibility EMC directive and Low Voltage Directive LVD of the Union European EU 32 TO RS 485 INTERFAC VERTER W OPTO ISOLATION 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 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 5 El aparato el ctrico debe ser usado nicamente con carr
10. he DIP Switch and Jumpers 3 1 DIP Switches The DIP switches control the transmit receive signals on the Converter Table 3 1 shows the default configuration of the switches Table 3 2 shows the different switch and jumper combinations for the Converter Also included in this section is a description of the switches CHAPTER 3 Configuration Table 3 1 DIP Switch Default Settings Position Function Switch Function S1 RTS Control OFF No RTS control of transmitter S2 DTR Control OFF No DTR control S3 Reserved OFF N A S4 Transmitter Control ON Constantly ON Table 3 2 Switch Combinations NOTE JP4B is N A S1 1 S1 2 S1 3 S1 4f JP4A JP3A and RTS DTR Always RS 485 JP3B Control Control OFF Reserved Always ON RS 485 full duplex OFF OFF ON OFF Both OFF Transmitter is ON RS 485 full duplex ON OFF OFF OFF Both OFF Transmitter is controlled by RTS RS 485 full duplex OFF ON OFF OFF Both OFF Transmitter is controlled by DTR Half duplex 4 wire ON OFF OFF 0 Both OFF controlled by RTS Half duplex 2 wire ON OFF OFF 0 Both ON controlled by RTS Half duplex 4 wire OFF ON OFF 0 Both OFF controlled by DTR Half duplex 2 wire OFF ON OFF 0 Both ON controlled by DTR RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION KEY TO TABLE 3 2 S1 1 S1 2 and S1 4 only one switch can be ON at any time The other
11. itos o pedestales 6 El to el ct deb d t t destal que sean recomendados por el fabricante 7 El aparato 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 0 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 1 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 2 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 3 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 4 El equipo el ct
12. rico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 5 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia a El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 7 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n 18 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 C 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 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners CONTENTS CONTENTS 1 Specifications 6 0 6 eee ooo 6 2 Introduction 0 0 0 cece ee nes 8 2 1 Description 0 cee eee 8 2 92 Feat res IA a hist Rey ab Oa lek 8 3 Configuration 0 0 6 eee eee ee 10 3 1 DIP Switches 0 0 00 0 000008 10 3 2 JUMPErS ini 14 4 InstallatioN oooooooooooooo o 15 4 1 Connection to the RS 485 Interface 15 4 1 1 4 Wire Connection Using RJ 45 15 4 1 2 2 Wire Connection Using R
13. rly the Converter must have one or two twisted pairs of metallic wire These pairs should be dry unconditioned metallic wire 24 AWG We recommend using Category 5 cable For your convenience the Converter is available with either a terminal block or an RJ 45 jack 4 1 1 4 WIRE CONNECTION USING RJ 45 The RJ 45 connectors on the Converter s RS 485 side are pre wired for a standard telco wiring environment The signal pin relationships are shown in Table 4 1 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION Table 4 1 RJ 45 Signal Pin Relationships RJ 45 Signal Connection to ground is optional Figure 4 1 RJ 45 Connector Pin Orientation In most modular RS 485 applications you ll need to use a crossover cable CHAPTER 4 Installation 4 1 2 2 WIRE CONNECTION Most RS 485 devices use a two wire hal duplex configuration When using this configuration first set the Converter to two wire mode then use only the transmit XMT pair as shown in Figure 4 2 Converter Signal RS 485 Signal MMe rs aia oso gt XMT A XMT eset seston ta gt XMT B Figure 4 2 Crossover cable wiring 4 1 3 4 WIRE CONNECTION USING TERMINAL BLOCKS If you purchased the IC525A F or IC525A M you will need to open the case to access the terminal blocks The following instructions will tell you how to open the case connect the bare wires to the terminal blocks and fasten the strain relief collar in place so th
14. two must be OFF We recommend that you disconnect the Converter while changing configurations JP4A If this jumper is off only the RS 485 transmitter is controlled by RTS or DTR If this jumper is ON both the RS 485 transmitter and receiver are controller by RTS or DTR When the transmitter is OFF the receiver will be ON and similarly when the transmitter is ON the receiver is OFF JP3A and JP3B Both jumpers are either ON or OFF When the jumpers are ON the RS 485 transmitter and receiver are connected directly together This will only function in half duplex mode When both jumpers are OFF the RS 485 transmitter and receiver are disconnected from each other The Converter can operate in either half or full duplex depending on the setting of JP4A SwitcH S1 RTS CONTROL When Switch Sl is in the ON position the DTE input signal RTS Pin 4 controls the transmitter of the Converter In this mode when RTS is high the Converter transmits data from the RS 232 port to the RS 485 port Switch S2 and S4 must be in the OFF position when Switch Sl is ON 1 Setting ON RTS controls the transmitter OFF RTS control is OFF CHAPTER 3 Configuration SwitcH S2 DTR CONTROL When Switch S2 is in the ON position the DTE input signal DTR Pin 20 controls the transmitter of the Converter In this mode when DTR is high the Converter transmits data from the RS 232 port to the RS 485 port NOTE Switches S1 and S4 must be OFF
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