B&B Electronics Buffered Smart Switch manual Auto Select/Smart Switch Mode, Description, Options

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Auto Select/Smart Switch Mode

Auto Select/Smart Switch Mode

Description

Auto Select mode allows the Slave devices to initiate communications with the device connected to the Master port. When Auto Select mode is enabled through the setup software, the 232BSS4 passes data automatically from the Slaves to the Master.

Each Slave port is buffered until the Master is available, then sent in turn. At any time, the Master can reply to the Slaves using the Send to Specific Ports command, or override the automatic switching by selecting a specific port for both transmit and receive.

When the Master device releases the Slave through the Turn Off all ports command, the automatic switching resumes. The 232BSS4 will revert back to the Slave port that was sending data before the Master took over or to the next sequential Slave port with data in its buffer. For a full description of the 232BSS4 commands, refer to the previous section, “Smart Switch Only Mode.”

Options

Initial Connections:

Upon power-up, the 232BSS4 can be initialized to allow the Master to send data to any of the Slave ports without any commands sent. The Master can also be set to broadcast to any or all of the Slave ports on power-up. This allows the switch to be used to add devices to an existing COM port without any software programming. The port initialization is configured through the setup software.

Timeouts:

When multiple Slave devices are sending data to the Master port at the same time, the 232BSS4 must determine when to stop sending from one Slave port and switch to the next. Two parameters are required to be entered in the setup software for 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.

Port Time:

Setting the Port Time for a value other than zero configures the Master device to receive data from a single port only for the length of time specified during setup. Times are set in milliseconds and can be anywhere in the range of 0 to 65,000 (65 seconds). A value of zero for the Port Time would give the transmitting Slave port access to the Master until an Inactivity Timeout was reached or until a specific Turn Off command was sent from the Master device.

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Documentation Number 232BSS4-2907m

B&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.comB&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 This product designed and manufactured in Ottawa, Illinois USA Buffered Smart SwitchModel 232BSS4 of domestic and imported parts byPage APPENDIX B CABLE CHARTS Table of ContentsCHAPTER 4 SETUP SOFTWARE APPENDIX C BLOCK DIAGRAMDocumentation Number 232BSS4-2907m Chapter 1 - Introduction Documentation Number 232BSS4-2907mSpecifications Default ParametersThe following equipment should be in the shipping carton Checklist1. RS-232 Buffered Smart Switch model 232BSS4 2. Instruction Manual 3. 2 3.5 floppy disksDocumentation Number 232BSS4-2907m Symbols and Conventions LED IndicatorsChapter 2 OPERATION Port Configurations Smart Switch Only Mode DescriptionOptions Four Character Command Format Command SummaryThree 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 Using the 232BSS4 as a Buffered Splitter/Combiner Figure 2.1. Multiple Terminals to a Host ControllerBack to Back Operation mux/demux Figure 2.2. Back to Back OperationCascading Multiple Switches Figure 2.3. Expanding the Number of Slave PortsSlave Devices that Automatically Send their Data Slave Devices that Require Polling 25 Pin DTE Chapter 3 PORT CONNECTIONSDTE/DCE Explanation 25 Pin DCEMaster Port Connections Slave Port ConnectionsChapter 4 SETUP SOFTWARE IntroductionConnection Select SETTINGS, CONTROL PANEL from the Windows START menu Software InstallationSoftware Uninstall Double Click ADD/REMOVE PROGRAMSSetup Tutorial Single Unit Main Screen26Documentation Number 232BSS42907 Manual Back to Back Main Screen 28Documentation Number 232BSS42907 Manual Copying Parameters Between Switches Default ParametersDocumentation Number 232BSS42907 Manual Appendix A ASCII Character Codes DECIMAL to HEX to ASCII CONVERSION TABLEASCII Appendix A Chart B.1. DTE PC DB25 Connector to Master Port Appendix B Cable ChartsPins 6, 8, & 20 looped back internally on the 232BSS4 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.6. Ports A - D DTE to DTE PC DB9 Connector Pins 1, 4, & 6 looped back internally on the 232BSS4Chart B.5. Ports A - D DTE to DTE PC DB25 Connector Chart B.7. Ports A - D DTE to DCE Modem DB25 ConnectorPins 1, 4, & 6 looped back internally on the 232BSS4 Chart B.8. Ports A - D DTE to DCE Modem DB9 ConnectorAppendix B Cable Charts UART Appendix C Block DiagramMASTER UART UARTAppendix C Appendix D Declaration of Conformity DECLARATION OF CONFORMITY
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