B&B Electronics 232BSS4, Buffered Smart Switch Operation, Symbols and Conventions, LED Indicators

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Chapter 2: OPERATION

Symbols and Conventions

Throughout this chapter of the manual, the following symbols and conventions will be used to clarify what type of data we are addressing.

•Items enclosed in {brackets} will denote one byte.

•A character in “quotes” will normally denote a printable ASCII character. A byte described in ALL CAPS is the ASCII description of a non-printable character. The abbreviation dec will denote a decimal value. The lower case letter h will be used to show a Hex value.

•Items in italics are optional items only used in certain configurations. The instances when these items are required will be explained in the text.

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.

In Smart Switch Only mode, the port LEDs indicate which port was selected through the Select Port command. In Auto Select mode, the port LEDs indicate which port is currently sending to the Master. No indication is provided to display which Slave port is currently receiving from the Master.

Documentation Number 232BSS4-2907m

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&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com

B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

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Contents Model 232BSS4 Buffered Smart SwitchThis product designed and manufactured in Ottawa, Illinois USA of domestic and imported parts byPage CHAPTER 4 SETUP SOFTWARE Table of ContentsAPPENDIX B CABLE CHARTS APPENDIX C BLOCK DIAGRAMDocumentation Number 232BSS4-2907m Documentation Number 232BSS4-2907m Chapter 1 - IntroductionDefault Parameters Specifications1. RS-232 Buffered Smart Switch model 232BSS4 2. Instruction Manual ChecklistThe following equipment should be in the shipping carton 3. 2 3.5 floppy disksDocumentation Number 232BSS4-2907m Symbols and Conventions LED IndicatorsChapter 2 OPERATION Port Configurations Smart Switch Only Mode DescriptionOptions Three Character Command Format Command SummaryFour Character Command Format Command ExplanationCommands Select Port A to transmit and receive - “A” VB Example Table 2.2 Send Only and Clear Buffer Control Characters Table 2.3 - Timer Values commands and the Master can initiate the next communications sequence Auto Select/Smart Switch Mode Inactivity Time Figure 2.1. Multiple Terminals to a Host Controller Using the 232BSS4 as a Buffered Splitter/CombinerFigure 2.2. Back to Back Operation Back to Back Operation mux/demuxFigure 2.3. Expanding the Number of Slave Ports Cascading Multiple SwitchesSlave Devices that Automatically Send their Data Slave Devices that Require Polling DTE/DCE Explanation Chapter 3 PORT CONNECTIONS25 Pin DTE 25 Pin DCESlave Port Connections Master Port ConnectionsChapter 4 SETUP SOFTWARE IntroductionConnection Software Uninstall Software InstallationSelect SETTINGS, CONTROL PANEL from the Windows START menu Double Click ADD/REMOVE PROGRAMSSingle Unit Main Screen Setup Tutorial26Documentation Number 232BSS42907 Manual Back to Back Main Screen 28Documentation Number 232BSS42907 Manual Default Parameters Copying Parameters Between SwitchesDocumentation Number 232BSS42907 Manual Appendix A ASCII Character Codes DECIMAL to HEX to ASCII CONVERSION TABLEASCII Appendix A Pins 6, 8, & 20 looped back internally on the 232BSS4 Appendix B Cable ChartsChart B.1. DTE PC DB25 Connector to Master Port Chart B.2. DTE PC DB9 Connector to Master PortAppendix B Cable Charts Pins 6, 8, & 20 looped back internally on the 232BSS4 Chart B.3. DCE Modem DB25 Connector to Master PortChart B.4. DCE Modem DB9 Connector to Master Port Chart B.5. Ports A - D DTE to DTE PC DB25 Connector Pins 1, 4, & 6 looped back internally on the 232BSS4Chart B.6. Ports A - D DTE to DTE PC DB9 Connector Chart B.7. Ports A - D DTE to DCE Modem DB25 ConnectorChart B.8. Ports A - D DTE to DCE Modem DB9 Connector Pins 1, 4, & 6 looped back internally on the 232BSS4Documentation Number 232BSS42907 Manual MASTER Appendix C Block DiagramUART UART UARTDocumentation Number 232BSS42907 Manual DECLARATION OF CONFORMITY Appendix D Declaration of Conformity