B&B Electronics 232BSS4 Manual
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B&B Electronics 232BSS4 Manual

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Documentation Number 232BSS41202 Manual
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Buffered Smart Switch
Documentation Number 232BSS41202
International Headquarters
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA
Phone (815) 433-5100 -- General Fax (815) 433-5105
Home Page: www.bb-elec.com
Sales e-mail:
orders@bb-elec.com
Technical Support e-mail:
European Headquarters
Westlink Commercial Park, Oranmore, Co. Galway, Ireland
Phone +353 91-792444 -- Fax +353 91-792445
Home Page: www.bb-europe.com
Sales e-mail:
Technical Support e-mail:
 1999 B&B Electronics -- Revised May 2002
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Model 232BSS4
-- Fax (815) 433-5109
support@bb.elec.com
B&B Electronics Ltd.
orders@bb-europe.com
support@bb-europe.com
CE
-- Fax (815) 433-5104
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Summary of Contents for B&B Electronics 232BSS4

  • Page 1 Buffered Smart Switch Model 232BSS4 Documentation Number 232BSS41202 International Headquarters B&B Electronics Mfg. Co. Inc. 707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA Phone (815) 433-5100 -- General Fax (815) 433-5105 Home Page: www.bb-elec.com Sales e-mail: orders@bb-elec.com...

  • Page 2: Table Of Contents

    Symbols and Conventions ..............4 LED Indicators ..................4 Port Configurations ................5 Smart Switch Only Mode ..............6 Auto Select/Smart Switch Mode .............13 Using the 232BSS4 as a Buffered Splitter/Combiner .....15 Back to Back Operation (mux/demux) ..........16 Cascading Multiple Switches ............17 Chapter 3: PORT CONNECTIONS .......20 DTE/DCE Explanation ..............20...

  • Page 3: Chapter 1: Introduction

    Two units can also be used back-to-back to provide automatic connection between devices over a single data channel. LEDs on the 232BSS4 indicate when the unit is powered up and which port is selected to send data to the Master port.

  • Page 4: Specifications

    PC compatible, Windows 95/98/NT/2000/XP Supplied Accessories: CDROM with Setup Program Instruction Manual Default Parameters When shipped, the 232BSS4 comes set up for the following parameters: Auto Select mode OFF DTR NOT required to accept commands THREE character command Char1 = ESC (Decimal 27) Char2 = STX (Decimal 2) Char3 = “0”...

  • Page 5: Checklist

    Examine the shipping carton and contents for physical damage. If damage is found, file a claim with the shipper immediately. The following equipment should be in the shipping carton: 1. RS-232 Buffered Smart Switch model 232BSS4 2. Instruction Manual 3. (2) 3.5" floppy disks If any of the items above are not in the shipping carton contact the shipper immediately.

  • Page 6: Chapter 2: Operation

    LED Indicators The 232BSS4 has five LED indicators. The first, labeled “+12 VDC POWER” indicates that power is applied to the switch. The other four, labeled “PORT A” to “PORT D” indicate which Slave port is currently selected to transmit to the Master.

  • Page 7: Port Configurations

    232BSS4 to send data. On the Slaves, pin eight (CTS) needs to be held high by the Slave device for the 232BSS4 to send data. The connected devices can prevent data from being sent from the 232BSS4 by holding their corresponding handshake lines low.

  • Page 8: Smart Switch Only Mode

    {Char1}{Char2} {Char3} {Command Character} Char1-3 would be defined by the user through the setup software. Char3 would only be sent if the 232BSS4 was set up for a four character command. Documentation Number 232BSS41202 Manual B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd –...
  • Page 9 Four Character Command Format: Control Char Char1 Char2 Char3 Command Char Control Char is only needed for Tx Only, Clear Buffer, and Ignore Commands Table 2.1 - 232BSS4 Command Summary Function Command Control Comments Char. Char. Select Port A Tx & Rx “A”...
  • Page 10 The Slave port that is sending to the Master is not affected. The lowest four bits of the control byte tell the 232BSS4 which ports should receive the following data. Bit 0 represents port A, Bit 1 represents port B, Bit 2 represents port C, and Bit 3 represents port D.
  • Page 11 Slave port buffers before it is sent to the Master. The lowest four bits of the control byte tell the 232BSS4 which ports’ buffers to purge. Bit 0 represents port A, Bit 1 represents port B, Bit 2 represents port C, and Bit 3 represents port D.
  • Page 12 15 or 79 “O” Note: The 232BSS4 ignores the upper 4 bits of the control byte. If the Master device is incapable of sending characters outside the printable ASCII range, decimal 64 can be added to each of the control bytes and the switch will operate properly.
  • Page 13 Note that these procedures are not needed if the binary file will be transferred from the Slave devices to the Master device. No switching commands are used in the 232BSS4 with data from this direction, so no inadvertent switching can occur.
  • Page 14 Method2 – Ignore Commands Using DTR The second method of ignoring command sequences is to set the 232BSS4 to ignore commands if DTR is low from the Master device. This option is enabled through the setup software. This method is useful if the length of the binary file transfers are not known.

  • Page 15: Auto Select/Smart Switch Mode

    Auto Select mode. The Port Time and Inactivity Time tell the 232BSS4 how much time to spend on each port, and how long a port must be inactive before switching to the next port.
  • Page 16 When the specified Port Time has elapsed, the 232BSS4 checks in sequence for other Slave ports with buffered data and switches to them. If no other Slave ports need access to the Master, the current Slave port will again be connected until another Port Time has elapsed.

  • Page 17: Using The 232Bss4 As A Buffered Splitter/Combiner

    To configure the 232BSS4 as a four port splitter/combiner: • Set up the ports on the 232BSS4 to match the data format of the connected devices. If the Slave devices stream data, the Master port should be set to a higher baud rate than the slaves.

  • Page 18: Back To Back Operation (Mux/Demux)

    For details on how to use the setup software, see Chapter 4. Note that in Back to Back operation the 232BSS4 Master ports will normally be connected to either the Master port of another switch or some type of modem.

  • Page 19: Cascading Multiple Switches

    If you have more than four devices that are sending data, more than one 232BSS4 can be cascaded, allowing more ports to be added. The 232BSS4 buffers data from all ports at once, making it well suited for devices that will send a fixed amount of data at sporadic intervals, such as measurement instruments, security access card readers, barcode scanners, or time clocks.
  • Page 20 Figure 2.3 shows a typical setup, with 16 devices sending information at random times to the PC. The switches at Level 2 receive the data and send it on to the Level 1 switch. The Level 1 switch buffers the data and sends it to the PC. Each of the switches will automatically send the data when it is available.
  • Page 21 Slave Devices that Require Polling: This configuration will also work with systems where the devices have to be polled for information. With the setup of Figure 2.3, the switches can be configured so that you still only have to send one set of switching characters. To do this, set the switches up in the following way: •...

  • Page 22: Chapter 3: Port Connections

    DTE/DCE Explanation In order to determine the proper port connections to the 232BSS4, it is necessary to have a basic understanding of the terms DTE and DCE. RS-232 was designed, using DB-25 connectors, for connecting a DTE (Data Terminal Equipment) device to a DCE (Data Communication Equipment) device.
  • Page 23 Master Port Connections: The Master Port of the 232BSS4 is a 25 pin female D-sub connector configured as a DCE. This provides direct connection to an IBM PC compatible or other DTE device. When connecting the Master port to a modem, the Master port of another 232BSS4, or other device configured as a DCE, a null modem adapter such as B&B’s model 232DTE is needed.

  • Page 24: Chapter 4: Setup Software

    Connection A serial (COM) port of the computer should be connected to the Master port of the 232BSS4. If the computer’s serial port is a 25 pin D-sub, a straight through connection cable is required. If the computer’s serial port is a 9-pin D-sub, the cable should be an XT to AT adapter cable such as B&B’s model 232CAM, or a cable that...

  • Page 25: Software Installation

    Software Installation The setup software for the 232BSS4 must be installed on your hard drive before it can be run. All directions assume the CDROM drive is assigned to drive D. If your drive is assigned another drive name, replace that name for D in the instructions. To install on your hard drive follow these steps: •...

  • Page 26: Setup Tutorial

    Step 4: If you are creating a configuration without a switch connected, proceed to “Single Unit Main screen.” Otherwise, select the way that the 232BSS4 will be used. If the 232BSS4 is going to be used with an intelligent Master device, or if only certain parameters are going to change, select Single Unit operation.
  • Page 27 Read Module Configuration: This button will read the configuration from the connected 232BSS4. The 232BSS4 is read upon entering the Main Screen, so it should not have to be read again unless it is necessary to set the parameters back after changing.
  • Page 28 Be sure to review all changes before saving using the View Module Configuration button. Run Self Test: The 232BSS4 is programmed with a Self Test mode. The microprocessor checks the UARTs, RAM, and EEPROM and reports any errors back to the setup software. If the software reports an error, contact B&B Technical Support.
  • Page 29 Load Configuration: The parameters for Unit #1 are automatically loaded when the Back-to-Back main screen is entered. Unit #2 is loaded the first time the Unit #2 tab is selected. The user should not have to reload the configuration except when the parameters need to be reset to those already saved in the switch.
  • Page 30 Copying Parameters Between Switches: The 232BSS4 setup software can save configuration data to a file for copying of parameters. Any unit’s setup can be copied by first reading the data from one switch, then saving to another. Step 1: Run the setup software.

  • Page 31: Appendix A: Ascii Character Codes

    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 ctrl @ ctrl A ctrl B “ ctrl C ctrl D ctrl E ctrl F &...

  • Page 32: Appendix B: Cable Charts

    <---------> 7 (GND) <----------- 8 (DCD) * -----------> 20 (DTR) * * - Pins 6, 8, & 20 looped back internally on the 232BSS4 Chart B.2. DTE (PC) DB9 Connector to Master Port DTE (PC) 232BSS4 Serial Port Signal Master Port (DCE)

  • Page 33: Chart B.3. Dce (Modem) Db25 Connector To Master Port

    ----------> 8 (CTS) <---------- * - Pins 1, 4, & 6 looped back internally on the 232BSS4 Appendix B: Cable Charts Documentation Number 232BSS41202 Manual B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd –...

  • Page 34: Chart B.6. Ports A-D (Dte) To Dte (Pc) Db9 Connector

    ----------> 8 (CTS) <---------- * - Pins 1, 4, & 6 looped back internally on the 232BSS4 Documentation Number 232BSS41202 Manual Appendix B: Cable Charts B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd –...

  • Page 35: Appendix C: Block Diagram

    Appendix C: Block Diagram 232BSS4 Block Diagram Documentation Number 232BSS41202 Manual Appendix C B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 Downloaded from Elcodis.com...

  • Page 36: Appendix D: Declaration Of Conformity

    DECLARATION OF CONFORMITY Manufacturer’s Name: B&B Electronics Manufacturing Company Manufacturer’s Address: P.O. Box 1040 707 Dayton Road Ottawa, IL 61350 USA Model Numbers: 232BSS4 Description: RS-232 4-Port Buffered Smart Switch Type: Light industrial ITE equipment Application of Council Directive: 89/336/EEC Standards:...

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