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RS-232 TO RS-485 INTERFACE CONVERTER W/OPTO ISOLATION

Table 4-1. RJ-45 Signal/Pin Relationships.

RJ-45

Signal

1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - N/C
2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - GND*
3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RCV-
4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - XMT+
5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - XMT-
6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RCV+
7 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - GND*
8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - N/C

*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.

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Summary of Contents for IC525A-F

Page 1: ... 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 ...

Page 2: ...s 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 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 f...

Page 3: ... la tina de baño lavabo sótano mojado o cerca de una alberca etc 6 El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instruccione...

Page 4: ...contactos y receptáculos donde salen del aparato 14 El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera qu...

Page 5: ...4 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners ...

Page 6: ... 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 RJ 45 17 4 1 3 4 Wire Connection Using Terminal Blocks 17 4 1 4 2 Wire Connection Using Terminal Blocks 20 4 2 Daisychain Topology 20 4 3 Connection to the RS 232 Interface 21 4 4 Operating the Converter 22 Appendix RS 232 Pin Configurations 23 ...

Page 7: ...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 IC526A M 1 DB25 male 1 RJ 45 Temperature 32 to 122 F 0 to 50 C Humidity 5 to 95 non condensi...

Page 8: ...7 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 ...

Page 9: ...conditioned twisted pairs The Converter can handle up to 32 terminal drops in a multipoint polling environment You can set carrier to constantly on controlled by RTS or controlled by DTR and the unit operates without echo 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...

Page 10: ...2 kbps Passes transmit and receive data Operates via 5 V power supply Operates without echo Driver controlled as constantly on controlled by RTS or controlled by DTR Compact size 0 8 H x 2 1 W x 3 8 D 2 x 5 3 x 9 7 cm Twisted pair connection via strain relief RJ 11 or RJ 45 2500 Vrms optical isolation ...

Page 11: ...ers on the board Figure 3 1 Location of the 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 ON OFF A B A B ON JP4 JP3 Power DIP Switch OF...

Page 12: ...nd RTS DTR Always RS 485 JP3B Control Control OFF TX 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 ON Both OFF controlled by RTS Half duplex 2 wire ON OFF OFF ON Both ON controlled by ...

Page 13: ... 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 S1...

Page 14: ...ch S2 is ON S2 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 transmi...

Page 15: ... 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 ...

Page 16: ...ction to the RS 485 Interface To function properly 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 ...

Page 17: ...N Table 4 1 RJ 45 Signal Pin Relationships RJ 45 Signal 1 N C 2 GND 3 RCV 4 XMT 5 XMT 6 RCV 7 GND 8 N C 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 1 1 ...

Page 18: ... 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 that the wires won t pull loose 1 If the case is not already open open it now by twisting it open wi...

Page 19: ...e 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 whi...

Page 20: ...e 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 IC525A 6A RS 422 485 Device Signal Terminal Block Signal XMT TB 5 RCV XMT TB 4 RCV RCV TB 1 XMT RCV TB 2 XMT ...

Page 21: ...pter 3 for this configuration then use only the transmit XMT pair as shown below Converter Signal RS 485 Signal XMT XMT 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 dat...

Page 22: ...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...

Page 23: ... 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 ...

Page 24: ...0 20 6 8 7 7 Figure A 2 Null Modem Pinning 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 ...

Page 25: ...24 RS 232 TO RS 485 INTERFACE CONVERTER W OPTO ISOLATION RJ 45 Signal 1 N C 2 GND 3 RCV 4 XMT 5 XMT 6 RCV 7 GND 8 N C Connection to ground is optional Figure A 2 RS 485 Pin Orientation 1 1 ...

Page 26: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved ...

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