IC108A IC108C IC108AE APRIL 2002 IC109A IC109A-R2 IC109C IC109AE RS-232↔485/422 Converter Plus RS-232↔485/422 Opto-Isolator/Converter 232↔485/422 US CONVERTER PL NORMAL S CD RX TX RT DCE DTE DLB TX RX CD RTS PWR 232↔485/422 ER OR/CONVERT OPTO-ISOLAT NORMAL DLB CUSTOMER SUPPORT INFORMATION S CD RX TX RT DCE DTE TX RX CD RTS PWR Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S.
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.
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.
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.
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.
CONTENTS Contents Chapter Page 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Jumper and Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.
RS-232↔485/422 CONVERTERS 1.
CHAPTER 1: Specifications Typical Speed Versus Distance (4-wire point-to-point 26-AWG twisted pair): Speed Distance 1200 bps 2400 bps 4800 bps 9600 bps 19,200 bps 38,400 bps 64,000 bps 115 kbps 4 miles (6.4 km) 3 miles (4.8 km) 2.3 miles (3.7 km) 1.7 miles (2.7 km) 1.2 miles (1.9 km) 0.9 mile (1.4 km) 0.75 mile (1.2 km) 0.4 mile (0.6 km) NOTE Speed and distances will depend on actual operating conditions.
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.
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.
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.
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 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 data.
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.
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).
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, resistor in place) 1⁄2-watt • Not connected 3. Half- or full-duplex operation • Full duplex • Half-duplex 4.
RS-232↔485/422 CONVERTERS Table 1 (continued). DCE Jumper Settings. Function 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 • Disable timeout delay W15 in B-C position and W17 msec A 70 B 7 C 2 D 0.7 E 0.15 c. RS-485 driver constantly enabled W9 in ON position 6.
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 (FailSafe), Receive S3 Off No line bias S3 On Line biased NOTE If line bias is on, the RS-485 CD will ALWAYS be on.
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.
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 driver.
RS-232↔485/422 CONVERTERS Table 2. DTE Jumper Settings. NOTE For additional information on the jumper requirements, see Section 3.1. Function Jumper Requirements 1. Configure RS-232 port as DTE XW1 in B position 2. Signal ground connected to frame ground • Connected • Not connected 3. Half- or full-duplex operation • Full duplex • Half-duplex 4. CTS delay 5. Enable RS-485 driver a.
CHAPTER 3: Installation Table 2 (continued). DTE Jumper Settings. Function Jumper Requirements b. RS-485 driver enabled by data • Disable timeout delay W15 in B-C position and W17 msec A 70 B 7 C 2 D 0.7 E 0.15 c. RS-485 driver constantly enabled W9 in ON position 6. Half-duplex turnaround delay • 0-msec turnaround delay • 0.
RS-232↔485/422 CONVERTERS Table 2 (continued). DTE Jumper Settings. Function Jumper Requirements 9. RS-485 Interface Line Biased (FailSafe), Receive S3 Off No line bias S3 On Line biased NOTE If line bias is on, the RS-485 CD will ALWAYS be on. 3.3 Typical Applications This section describes some typical applications where the RS-232↔485/422 Converter might be used. The connections shown in the figures are for the RS-485 port.
CHAPTER 3: Installation Figure 5. Point-To-Point, 4-Wire (Full- or Half-Duplex). Figure 6. Point-to-Point, 2-Wire (Half-Duplex).
RS-232↔485/422 CONVERTERS Figure 7 shows a typical multipoint, 4-wire, full- or half-duplex connection. Figure 8 shows a typical multipoint, 2-wire, half-duplex connection. In the multipoint applications depicted in Figures 7 and 8, the devices at the extreme opposite ends of the installation are terminated by setting switch S2 to the TERM position. These devices are the two devices that have the greatest cable length between them, not necessarily the devices that are physically located the farthest apart.
CHAPTER 3: Installation Figure 8. Multipoint, 2-Wire (Half-Duplex). Sample 4-Wire Multipoint Configuration In the following application, an industrial controller is used to gather information from several remote programmable logic controller (PLC) stations (see Figure 9). A system protocol has been defined such that all the programmable logic controllers receive the information sent by the industrial controller, but only the remote station specifically addressed will respond.
RS-232↔485/422 CONVERTERS RS-232↔485/422 Converter Plus Figure 9. Sample Multipoint Operation. Installation Procedure for the Multipoint Application in Figure 9 1. Set all the RS-232↔485/422 Converters for DCE operation (jumper XW1 in position A). 2. Connect a straight-through cable from the RS-232 port on each RS-232↔485/422 Converter to the RS-232 port on each of the PLCs. 3. Set all the RS-232↔485/422 Converters for normal operation (switch S1 in the “Normal” position). 4.
CHAPTER 3: Installation 7. Since all the remote PLC stations must be inactive until addressed, the RS-485 driver of each remote RS-232↔485/422 Converter must not be constantly enabled (W9 of each remote RS-232↔485/422 Converter must be set to a position other than ON). The remote PLCs are fairly far from the industrial controller in our example, so it would be wise to set the CTS Delay (jumper W9) for 10 msec.
RS-232↔485/422 CONVERTERS Appendix A. Pinning Table 3. RS-232 interface (* denotes pins that are used).
APPENDIX A: Pinning Table 4. RS-485 pinning chart. Pin Name Description TXA and TXB TXA=TXTXB=TX+ Data received by the RS-232↔485/422 Converter at the RS-232 port is transmitted out of the unit over twistedpair wires via these two outputs. The TX LED indicates the state of these two leads. When the TXA lead is positive with respect to the TXB lead (a “zero” being transmitted), the TX LED is lit. RXA and RXB RXA=RXRXB=RX+ These are the received data inputs for the RS-485 port.
RS-232↔485/422 CONVERTERS Quick Reference: User-Selectable Options Use this list as a quick-reference guide when you need to change the jumper settings. An asterisk (*) designates the factory-preset jumper settings. XW1A XW1B DCE* DTE W8 A-B* B-C 4-wire 2-wire W15 A-B* B-C RTS/CD enabled Data enabled (Maximum speed is 64K.) W5 A-B* B-C RTS/CTS* delay (normal) RTS/CTS/CD delay (CTS inhibited if CD is present when RTS is raised.
QUICK REFERENCE: USER-SELECTABLE OPTIONS W16 Turnaround delay (When W8 is in the B-C [2 wire] position, this is the time after the driver is disabled and before the receiver is enabled.) A 0 msec B* 0.1 msec C 1 msec D 5 msec E 35 msec NOTE If the Converter is configured Data Enabled (W15, position B-C) and 2wire (W8 position B-C), then delays from W17 and W16 are cumulative.
© Copyright 2002. Black Box Corporation. All rights reserved.
