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B&B Electronics 485DSS - page 1
Distributed Smart Switch Model 485DSS Document No. 485DSS3298 This product Designed and Manufactured In Ottawa, Illinois USA of domestic and imported parts by B&B Electronics Mfg. Co. Inc. 707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Internet: http://www.bb-elec.com sales@bb-elec.com support@bb.el ...
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B&B Electronics 485DSS - page 2
485DSS3298 Manual Table of Cont ents i B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 TABLE OF CONTENTS CHAPTER 1: HARDWARE ................................................................... 1 I NTRODUCTION ......................................................................................... 1 Fi ...
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B&B Electronics 485DSS - page 3
ii Table of Contents 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 APPENDIX C: CABLE CHARTS ...................................................... C- 1 C HART 1. IBM PC DB25 C ONNECTOR TO .......................................... C- 1 485DSS RS-232 (DTE) P ORT ..................... ...
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B&B Electronics 485DSS - page 4
485DSS3298 Manual 1 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Chapter 1: HARDWARE Introduction The RS-485 Distributed Smart Switch (485DSS) connects one RS-232 device to an RS-485 multi-node network as shown in Figure 1. To accomplish this, the 485DSS converts RS-232 to an addressable RS-485 node ...
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B&B Electronics 485DSS - page 5
2 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Specifications Model: 485DSS Size: 4.8"L x 2.15" W x 0.9"H Power: +11 to 16 Vdc 75m A RS-232 Connection: DB-25 male (DTE configured) RS-485 Connection: Terminal Blocks Communications: 9600 baud, no parity, 8 data bits, 1 ...
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B&B Electronics 485DSS - page 6
485DSS3298 Manual 3 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 RS-232 Port The RS-232 DTE port is an asynchronous port that supports TD and RD signals. In order to make the proper connections to the RS- 232 port. It is necessary to have a basic understanding of the terms DCE and DTE. The original ...
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B&B Electronics 485DSS - page 7
4 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 RS-422/485 Wiring RS-485 receivers also have an enable/disable control line. The 2W/4W jumper selects when to enable and disable RS-485 receiver. Setting the jumper to the 4 W position constantly enables the receiver which is the same ...
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B&B Electronics 485DSS - page 8
485DSS3298 Manual 5 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 SD control automatically enables the RS-485 driver by sensing the leading edge of the first character transmitted to the RS-232 port. After transmitting the last character, the send data timer circuit waits one character time (1 millis ...
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B&B Electronics 485DSS - page 9
6 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Figure 3. RS-485 Wiring Diagram 4-Wire Mode To configure the 485DSS for RS-485 or 422 four-wire mode, place the jumper in the 4 W position. Refer to Figure 4 for connecting information and Figure 2 for the jumper location. In this posi ...
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B&B Electronics 485DSS - page 10
485DSS3298 Manual 7 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Figure 4. RS-422 Wiring Diagram RS-485 and RS-422 Termination A jumper labeled “TERM” provides termination for the RS- 485/422 receiver. The termination resistor is a 120-ohm resistor placed between the RD (A) and RD (B) lines. To ...
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B&B Electronics 485DSS - page 11
8 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Operation The host computer of the RS-485 network cont rols each 485DSS on the network by sending them command messages. These commands can turn a 485DSS on or off, and can also request status from an individual or from all of the 485D ...
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B&B Electronics 485DSS - page 12
485DSS3298 Manual 9 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Three red LED indicators are loca ted on top of the 485DSS. The LED labeled TD flashes when the RS-232 device is transmitting data. The LED labeled RD flashes when data is being received by the 485DSS from the RS-485 network. The LED l ...
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B&B Electronics 485DSS - page 13
10 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 The Command String All Command Strings consist of four ASCII characters. The first character is the start of message character, " X-off " (decimal 19). The second and third characters represent the hexadecimal address of an ...
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B&B Electronics 485DSS - page 14
485DSS3298 Manual 11 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 If you were writing a program in BASIC to turn on address 10 decimal (0A hexadecimal) you might form a string like this: DSS0AON$ = CHR$(19) + "0" + "A" + CHR$(1) You could then send DSS0AON$ to select 485DSS addre ...
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B&B Electronics 485DSS - page 15
12 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 in the address field specifies all 485DSS's on the network. This command temporarily turns off (disconnect) the RS-232 port from the network while transmitting the reply message. The reply message transmitted by the 485DSS consis ...
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B&B Electronics 485DSS - page 16
485DSS3298 Manual 13 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Example: A unit with a decimal address of ten will have a delay of 220 milliseconds [(10 x 0.02) + 0.02 = 0.22 seconds]. Command character: ACK (decimal 6) Example 1: To request status from the 485DSS set to address 11 ( 0B hex) decim ...
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B&B Electronics 485DSS - page 17
14 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 If you were writing a program in BA SIC to request status from address 5 decimal, you might form a string like this: DSS05RS$ = CHR$(19) + "0" + "5" + CHR$(6) You could then send DSS05RS$ to request status from 485 ...
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B&B Electronics 485DSS - page 18
485DSS3298 Manual 15 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Example 1: To set the address to decimal 21 (15 hex), you would turn on switches 1, 3, and 5 (1 + 4 + 16 = 21). Example 2: To set the address to 123 decimal (7B hex), turn on switches 1, 2, 4, 5, 6, and 7 (1 + 2 + 8 + 16 + 32 + 64 = 1 ...
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B&B Electronics 485DSS - page 19
16 485DSS3298 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Chapter 2: SOFTWARE Description The Distributed Smart Switch Demonstration (DSS_DEMO) Program (IBM PC or Compatible) provides the user with examples of how to receive and transmit commands to the 485DSS. The DSS_DEMO.EXE is a DOS exec ...
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B&B Electronics 485DSS - page 20
485DSS3298 Manual 17 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Running Demonstration Program Before you can run the demonstration program, you must run the install program described in the “Hard Drive Installation” section above. Make sure you have made the proper connections from the 485DSS ...
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B&B Electronics 485DSS - page 21
485DSS3298 Manual Appendix A A- 1 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Appendix A: ASCII Character Codes DECIMAL to HEX to ASCII CONVERSION TABLE DEC HEX ASCII KEY DEC HEX ASCII DEC HEX ASCII DEC HEX ASCII 0 0 NUL ctrl @ 32 20 SP 64 40 @ 96 60 ` 1 1 SOH ctrl A 33 21 ! 65 41 A 97 61 a 2 2 STX ...
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B&B Electronics 485DSS - page 22
485DSS3298 Manual Appendix B B- 1 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Appendix B: Decimal/Hexadecimal/Conversions The decimal (base 10) numbering system represents each position in successive powers of 10, with each decimal symbol having a value from 0 to 9. The h exadecimal (base 16) numbe ...
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B&B Electronics 485DSS - page 23
B- 2 Appendix B 485DS32985 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Hexadecimal to Decimal Conversion: Each “Hex digit” is the decimal equivalent value of the hexadecimal symbol. Example: Convert 10FC hexadecimal to decimal. Decimal = (1st Hex digit x 4096) + (2nd Hex digit x 256) + ( ...
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B&B Electronics 485DSS - page 24
485DSS3298 Manual Appendix C C- 1 B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Appendix C: Cable Charts These charts indicate some common cable wiring based on the 485DSS RS-232 and RS-485/422 ports. Refer to the Port Configuration section of this manual for more information. Chart 1. IBM PC DB25 Co ...
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B&B Electronics 485DSS - page 25
C- 2 Appendix C 485DS32985 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Chart 4. RS-232 DCE Device w/DB9 Connector to 485DSS RS-232 (DTE) Port RS-232 DCE Serial Port DB9 Connector Signal Direction 485DSS RS-232 (DTE) Port DB25 Connector 2 -----------> 3 3 <----------- 2 5 <---------& ...
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B&B Electronics 485DSS - page 26
FCC Class A Equipm ent Statem ent FEDERA L COMM UNI CA TIONS COM MISSI ON RA DIO FREQ UENCY I NTERFA CE STA T EMENT Class A Equipmen t This equipm ent has been test ed and found to com ply wi th the limits for Class A digital device, pur suant to Part 15 of the FCC Rules. T hese lim its are des igned to provide reasonable pr otection against harm f ...
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