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RS-232↔RS-422/485 Converter
CUSTOMER
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
SUPPORT
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
(Data Only)
C O N V E R T E R
2 3 2 ↔ 4 2 2 /4 8 5
D A T A O N L Y
NOVEMBER 1993
P W R
T X
R X
IC107A
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Summary of Contents for Black Box RS-422
- Page 1 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 SUPPORT Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 RS-232↔RS-422/485 Converter (Data Only) FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT 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.
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Page 3: Table Of Contents
Contents Contents Section Page 1. Specifications ....................4 2. Introduction....................5 2.1 Typical Applications................5 3. Installation ....................7 4. Operation...................... 9 4.1 RS-232 Circuitry..................9 4.2 RS-422/485 Circuitry ................11 Appendix: Connector Pinning ................ 12... -
Page 4: Specifications
@ 70 mA, or 230 VAC/50 Hz model, @ 35 mA; Secondary: 17 volt Leads supported — RS-232 port: 1- center tapped, 0.7 ma; Connector 8, 20; RS-422/485 port: TXA, TXB, pinning: RXA, RXB Function Indicators — (3) LEDs: TX, RX,... -
Page 5: Introduction
RS-232↔RS- communicate. It operates over 422/485 converter. The connections 4-wire lines, in full-duplex operation. shown are for the RS-422/485 port. A resistor shown in the circuit A four-wire terminal block on the indicates that the termination RS-422/485 port makes installation resistor has been selected via switch easy. - Page 6 RS-232↔RS-422/485 Converter (Data Only) RS-232↔RS-422/485 INTERFACE CONVERTER DATA LOGGER BAR-CODE LATHE READER Fig. 2-2. 4-Wire Multipoint Application (Full-Duplex Operation).
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Page 7: Installation
Pins B and C. socket XW1A. CR18 RS-422/485. CR20 CR22 CR17 CR21 Connector CR19 CR10 CR12 CR11 DEFAULT POSITION UNTERM TERM A B C "UNTERM" A B C RS-232 Connector XW1A XW1A XW1B XW1A Fig. 3-1. The RS-232↔RS-422/485 Converter's Circuit Board. - Page 8 "TERM" position, the resistor acceptable levels. Otherwise the network is connected across converter could sustain damage the line, and the RS-422/485 due to voltage differences interface is terminated. When between the RS-232 and RS- S2 is placed in the "UNTERM"...
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Page 9: Operation
Chapter 4: Operation 4. Operation 4.1 RS-232 Circuitry through the converter from the RS- 232 side to the RS-422/485 side, one The RS-232 side of the converter is of these conditions must be met: composed of the RS-232 drivers and... - Page 10 RS-232 interface: When configured as DTE, data received the RS-232 interface is configured as on RXA and RXB pins of the RS-422 DCE, data received on the RXA and /485 interface will be sent out Pin 2...
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Page 11: Rs-422/485 Circuitry
Chapter 4: Operation 4.2 RS-422/485 Circuitry systems where only two devices are connected to the line, each device The RS-422/485 side of the should have the termination net- converter is made up of the driver, work connected to the line. In... -
Page 12: Appendix: Connector Pinning
Pin 4 — RTS When the converter is set for DCE, RTS is an input which turns on the RS-422/485 driver when true. When the converter is set for DTE, RTS is always an output and is always true. (In DTE mode, CD controls the RS-422/485 driver.) - Page 13 TXB lead (a zero is being transmitted), the "TX" LED is lit. RXA and RXB These are the received data inputs for the RS-422/485 port. The status of these leads is monitored by the "RX" LED. When the RXA lead is positive with respect to the RXB lead (a zero is being received), the "RX"...
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