Instruction/ maintenance manual of the product RS-232/485 CONVERTER Black Box
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MARCH 1998 IC620A-F IC623A-M IC620A-M IC624A-F IC623A-F IC624A-M RS-232/485 Con verter CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S. 24 hours, 7 A.
1 FCC AND IC STATEMENTS FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA 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 communi- cation.
2 RS-232/485 CONVERTER NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
3 NOM STATEMENT 10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros aparatos (incluyendo amplificadores) que producen calor .
4 RS-232/485 CONVERTER TRADEMARKS Product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.
5 TABLE OF CONTENTS CONTENTS 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .6 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.1 Description . . . . . . . . . . . . . . . . . . . . . . .8 2.2 Features . . . .
6 RS-232/485 CONVERTER 1. Specifications Transmission Format — Asynchronous Data Rate — Up to 115,200 bps Range — Up to 9 miles (14.4 km) Serial Interface — EIA/TIA-574 standard RS-232 DCE Con.
7 CHAPTER 1: Specifications CTS turns ON after the terminal raises RTS RTS/CTS Delay — 8 msec or “no delay” Carrier — The carrier is switch-selected either continuous operation or switched ope.
8 RS-232/485 CONVERTER 2. Introduction 2.1 Description The RS-232/485 Converter (IC620A) is an ultra- miniature interface converter. Requiring no AC power or batteries for operation, the Converter supports asynchronous communication up to 115.2 Kbps over one or two unconditioned twisted pairs.
9 CHAPTER 2: Introduction Six models are available: • DB9F/Term (IC620A-F) • DB9M/Term (IC620A-M) • DB9F/RJ-11 (IC623A-F) • DB9M/RJ-11 (IC623A-M) • DB9F/RJ-45 (IC624A-F) • DB9F/RJ-45 (IC624A-M) 2.2 Features • Operates asynchronously, point-to-point or multipoint, over 2 or 4 wires.
10 RS-232/485 CONVERTER • Twisted-pair connection via strain relief, RJ-11, or RJ-45. • Silicon Avalanche Diode surge protection. • A Transmitter On signal received at the RS-485 RCV connection will cause DCD output at the RS-232 connector to assert High.
11 CHAPTER 3: Configuration 3. Configuration The Converter is configured using two internal 4-position DIP switches. This section shows how to access the DIP switches, provides an overview of the factory-default settings, and describes all possible configuration options.
12 RS-232/485 CONVERTER Figure 3-1. Underside of the Converter’s main PC board, showing the location of DIP switch S1. Switch S1.
13 CHAPTER 3: Configuration Figure 3-2. Top of the Converter’s daughterboard, showing the location of DIP switch S2. Switch S2 RCV XMT G - ++ -.
14 RS-232/485 CONVERTER To access the Converter’s internal PC boards, insert a small flat-blade screwdriver between the connector and the lip of the case and twist gently as shown in Figure 3-3 . Figure 3-3. Opening the Converter’s plastic case with a small screwdriver.
15 CHAPTER 3: Configuration Both DIP switch S1 and S2 are marked with individual switch numbers 1 through 4. Use these numbers, and the “ON” designation to orient the switch properly (see Figure 3-4 ). Use a small screwdriver or similar instrument to set each individual switch.
16 RS-232/485 CONVERTER 3.1.1 DIP S WITCH S1 S ETTINGS DIP switch S1 is used to configure receive impedance (termination), 2-wire/4-wire operation and “echo” enable/disable. Table 3-1 shows the factory-default settings for switch S1. Following Table 3-1 is a detailed description of each switch.
17 CHAPTER 3: Configuration S1-1: Receive Impedance (Termination) The setting for switch S1-1 selects the impedance of the input receiver. You may select either a “low” impedance of 120 ohms or a “high” impedance of 16 K ohms. By selecting the proper impedance for each drop, you can have up to 50 receivers in one application.
18 RS-232/485 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). S1-4 Setting On Echo On Off Echo Off 3.1.2 DIP S WITCH S2 S ETTINGS DIP switch S2 is used to configure carrier control, RTS/CTS delay, and communication protocol.
19 CHAPTER 3: Configuration S2-1: Carrier Control Method The setting for S2-1 determines whether the carrier is “Constantly On” or “Controlled by RTS.” This allows for operation in switched carrier, multipoint, and/or hardware handshaking applications.
20 RS-232/485 CONVERTER S2-3 and S2-4: “Transmit Off” Impedance Switches S2-3 and S2-4 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.
21 CHAPTER 3: Configuration The switch settings generally needed to configure the Converter for these applications are shown in Table 3-3 . NOTE Do not change switch settings until you have carefully read Section 3.
22 RS-232/485 CONVERTER 4. Installation Once the Converter is properly configured, it is ready to connect to your system. This section tells you how to properly connect the Converter to the twisted-pair and EIA/TIA-574 interfaces, and how to operate the Converter.
23 CHAPTER 3: Configuration For your convenience, the Converter is available with several different twisted-pair interfaces: RJ-11 jack, RJ-45 jack, and terminal blocks with strain relief. The Converter is also available with DB25 male or female connectors.
24 RS-232/485 CONVERTER 3. Strip the insulation on each of the twisted- pair wires about 1⁄8 inch. Figure 4-2. Stripping the insulation on the twisted-pair wires.
25 CHAPTER 3: Configuration XMT+----------------------------------------RCV+ XMT- --------------------------------------- RCV- G-------------To Shield (Optional) G RCV+-----------------------------------------XMT+ RCV - ----------------------------------------XMT- Figure 4-3.
26 RS-232/485 CONVERTER Figure 4-5. Wires connected to the terminal block. 8. Place the two halves of the strain-relief assembly on either side of the telephone wire and press together very lightly. Slide the assembly so that it is about two inches from the terminal posts and press together firmly.
27 CHAPTER 3: Configuration 9. Insert the strain-relief assembly with the wire going through it into the slot in the bottom half of the modem case and seat it into the recess in the case. (If the telephone wire is too thin to be held by the strain-relief assembly, you will need to order a different-sized strain relief.
28 RS-232/485 CONVERTER 10. Bend the top of the case as necessary to place it over the strain-relief assembly. Do not snap the case together yet. Figure 4-8. Closing the case. 11. Insert one captive screw through a saddle washer and then insert the captive screw, with the washer on it, through the hole in the DB25 end of the case.
29 CHAPTER 3: Configuration 4.1.2 T WISTED -P AIR C ONNECTION U SING RJ-11 OR RJ-45 The RJ-11 and RJ-45 connectors on the Converter’s twisted-pair interface are pre-wired for a standard telco wiring environment. The signal/pin relationships are shown in Figure 4-9 .
30 RS-232/485 CONVERTER Signal Pin# Pin# Signal GND 1 1--------------6 GND 1 RCV- 2--------------4 XMT- XMT+ 3--------------5 RCV+ XMT- 4--------------2 XMT+ RCV+ 5--------------3 XMT+ GND 1 6--------------1 GND 1 1 Connection to ground is optional. Figure 4-10.
31 CHAPTER 3: Configuration Signal Pin# Pin# Signal XMT+ 3---------------3 XMT+ XMT- 4---------------4 XMT- Figure 4-12. RJ-11 Cable (2-wire). Signal Pin# Pin# Signal XMT+ 4--------------4 XMT+ XMT- 5--------------5 XMT- Figure 4-13. RJ-45 Cable (2-wire).
32 RS-232/485 CONVERTER D AISYCHAIN T OPOLOGY 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.
33 CHAPTER 3: Configuration 4.3 Connection to the EIA/TIA-574 Interface The Converter is designed to plug directly into the DB9 serial port of an EIA/TIA-574 DTE device (PC, laptop, host).
34 RS-232/485 CONVERTER 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.
35 APPENDIX Appendix: EIA/TIA-574 Interface DB9 Signal Direction 1----------------------CD Output 2----------------------RD Output 3----------------------TD Input 4----------------------DTR Input 5---.
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746 © Copyright 1998. Black Box Corporation. All rights reserved..
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