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APRIL 2002
IC108A IC109A
IC108C IC109A-R2
IC108AE IC109C
IC109AE
RS-232↔485/422 Converter Plus
RS-232↔485/422 Opto-Isolator/Converter
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
SUPPORT
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
232↔485/422
CONVERTER PLUS
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FCC AND IC RFI 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 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 B of Part 15 of FC
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RS-232↔485/422 CONVERTERS 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. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso deben ser seguidas. 5.
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NOM STATEMENT 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13. 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 atención a los 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 ext
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RS-232↔485/422 CONVERTERS TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners. 4
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CONTENTS Contents Chapter Page 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Jumper and Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.1 DTE/D
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RS-232↔485/422 CONVERTERS 1. Specifications Optical Isolation: IC109A, IC109AE, IC109C only Interface: (1) asynchronous RS-232 port (DTE/DCE selectable); (1) asynchronous RS-485 port with improved surge protection and switch-selectable line termination or line bias Connectors: (1) DB25 female RS-232 port; (1) four-wire terminal block (TB1) RS-485 port Pins Supported: RS-232 port: TD, RD, RTS, CTS, CD, DTR, DSR, SG, and FG; RS-485 port: TXA, TXB, RXA, RXB Data Rate: Up to 115 kbps, transparent to
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CHAPTER 1: Specifications Typical Speed Versus Distance (4-wire point-to-point 26-AWG twisted pair): Speed Distance 1200 bps 4 miles (6.4 km) 2400 bps 3 miles (4.8 km) 4800 bps 2.3 miles (3.7 km) 9600 bps 1.7 miles (2.7 km) 19,200 bps 1.2 miles (1.9 km) 38,400 bps 0.9 mile (1.4 km) 64,000 bps 0.75 mile (1.2 km) 115 kbps 0.4 mile (0.6 km) NOTE Speed and distances will depend on actual operating conditions. 7
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RS-232↔485/422 CONVERTERS 2. Introduction The RS-232↔485/422 Converter Plus is an RS-232-to-RS-485 interface converter that operates in the same manner as a line driver. It allows an RS-232 device to transmit data over much longer distances than is normally possible (up to 4 miles—6.4 km—at 1200 bps). The advantage of the RS-232↔485/422 Converter Plus over other line drivers is that it can also operate in multipoint applications. Depending on the operating environment, as many as 64 devices can
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CHAPTER 3: Installation 3. Installation This section describes the jumper and switch functions for configuring the RS-232↔485/422 Converter. See Figure 1 on the next page for the component locations. To install your RS-232↔485/422 Converter: 1. Set each of the ten jumpers/switches for your application. 2. Connect the RS-232↔485/422 Converter devices together as shown in Figures 5 through 8 (pages 23–25). 3. Apply power. (PS154 or PS154E, depending on which RS-232↔485/422 Converter you have. See
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RS-232↔485/422 CONVERTERS NOTE When the jumper W9 (CTS) is in the ON position and jumper W15 is in the A-B position, the RS-485 driver is always turned on to enable transmission of data. Therefore, half-duplex transmission cannot be performed. See Section 3.1.5 for an explanation of the RS-485 driver. Figure 1. Layout of the Printed Circuit Board. 10
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CHAPTER 3: Installation 3.1.4 CTS DELAY (W9 JUMPER) When the transmitter of a device is first turned on, an unstable carrier signal is transmitted for several milliseconds. If data was sent during this period, it would be received as distorted information. Setting a CTS delay on the RS-232↔485/422 Converter allows the communications link to settle down before data can be sent. RS-232↔485/422 Converter as DCE (XW1A 8-Position Shunt) When the RS-232↔485/422 Converter is configured as a DCE device
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RS-232↔485/422 CONVERTERS Driver Enabled by Data The RS-485 driver can also be enabled without requiring an RS-232 control lead to be asserted. When jumper W15 is placed in the B-C position, the driver is enabled when data is received on the RS-232 port of the RS-232↔485/422 Converter. As soon as the first bit of the first character is received at the RS-232 port, the RS-485 driver is enabled and an internal timer is started. The timer begins its “time out” on a low (0) to high (1) transition of
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CHAPTER 3: Installation Point-to-Point When only two devices are connected to the line in a point-to-point application, each device should have the termination network connected to the line. Set switch S2 to the “TERM” position. Multipoint For multipoint applications, switch S2 should be in the “UNTERM” position on all the RS-232↔485/422 Converter devices in the network except for the two units at the extreme opposite locations on the line. The extreme opposite devices are the two devices that h
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RS-232↔485/422 CONVERTERS 3.2 DCE/DTE Configuration This section contains block diagrams (Figures 2 and 4) and jumper and switch settings (Tables 1 and 2) for DCE/DTE operation. For a detailed description of the jumpers and switches, see Section 3.1. Figure 2. Simplified Functional Block Diagram (DCE Operation). 14
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CHAPTER 3: Installation Table 1. DCE Jumper Settings. NOTE For additional information on the jumper requirements, see Section 3.1. Function Jumper Requirements 1. Configure RS-232 port as DCE XW1 in A position 2. Signal ground connected to frame ground • Connected W7 is IN (solder your own 100-ohm, 1 ⁄2-watt resistor in place) • Not connected W7 is OUT 3. Half- or full-duplex operation • Full duplex W8 in FULL position (4 wire, A-B) • Half-duplex W8 in HALF position (2 wire, B-C) 4. CTS delay •
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RS-232↔485/422 CONVERTERS Table 1 (continued). DCE Jumper Settings. Function Jumper Requirements 5. Enable RS-485 driver a. RS-485 driver enabled by RS-232 control leads • by RTS W15 in A-B position and W9 in 0-ms position W9 in 10-ms position W9 in 30-ms position b. RS-485 driver enabled by data W15 in B-C position and • Disable timeout delay W17 msec A70 B7 C2 D 0.7 E0.15 c. RS-485 driver constantly enabled W9 in ON position 6. Half-duplex turnaround delay W8 in HALF position and • 0-msec tu
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CHAPTER 3: Installation Table 1 (continued). DCE Jumper Settings. Function Jumper Requirements 7. RS-485 interface terminated or unterminated • Terminated S2 in TERM position • Unterminated S2 in UNTERM position 8. Normal or loopback operation • Normal mode S1 in Normal position • Loopback mode S1 in Loopback position 9. RS-485 Interface Line Biased (Fail- S3 Off No line bias Safe), Receive S3 On Line biased NOTE If line bias is on, the RS-485 CD will ALWAYS be on. 17
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RS-232↔485/422 CONVERTERS Figure 3. Line Bias. S2 shows the line termination when “Term” is selected. S3 shows line bias when “Bias” is selected. 18
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CHAPTER 3: Installation Opto-isolated barrier in IC109 models Figure 4. Simplified Functional Block Diagram (DTE Operation). NOTE The delay settings for W9 apply only to the CTS output of the RS-232↔485/422 Converter. Since CTS is not used when the RS-232↔485/422 Converter is configured as a DTE device, placing jumper W9 in either the 0-, 10-, or 30-msec position will allow the CD input to enable the RS-485 driver. When jumper W9 is in the ON position, the CD input has no affect on the RS-485
