B&B Electronics Buffered Smart Switch manual Using the 232BSS4 as a Buffered Splitter/Combiner

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Using the 232BSS4 as a Buffered Splitter/Combiner

Using the 232BSS4 as a Buffered Splitter/Combiner

The Auto Select and Initial Connection features of the 232BSS4 can be used to effectively create a data splitter. Data from the Master device can be shared with multiple Slave devices. Any data coming from the Slaves is buffered so that no data is lost. If the Slave devices already include an address or identifier, no software changes are required.

Figure 2.1 shows a typical configuration allowing several serial terminals access to the same host.

CPU / Controller

232BSS4 +12 VDCMASTER PORT POWER

www.bb-elec.com Ottawa, IL 61350 USA

B&BelectMANUFACTURING COMPANYronics	A Port B Port C Port D
	Port

Terminal / HMI

Terminal / HMI

Terminal / HMI

Terminal / HMI

Figure 2.1. Multiple Terminals to a Host Controller

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.

•Set the switches to turn on the Auto Select feature.

•Set the Port Timer to 0. If the Slave devices stream data, the Time per Port may have to be set to a non-zero value.

•Set the Inactivity Timer on all of the switches to somewhere between 20 and 500 milliseconds, depending on the space between data packets and the response time required to each connected device.

•Set the Initial Connections for all ports to receive from the Master on start up.

16	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 Buffered Smart Switch Model 232BSS4This product designed and manufactured in Ottawa, Illinois USA of domestic and imported parts byPage Table of Contents CHAPTER 4 SETUP SOFTWAREAPPENDIX B CABLE CHARTS APPENDIX C BLOCK DIAGRAMDocumentation Number 232BSS4-2907m Chapter 1 - Introduction Documentation Number 232BSS4-2907mSpecifications Default ParametersChecklist 1. RS-232 Buffered Smart Switch model 232BSS4 2. Instruction ManualThe following equipment should be in the shipping carton 3. 2 3.5 floppy disksDocumentation Number 232BSS4-2907m Chapter 2 OPERATION Symbols and ConventionsLED Indicators Port Configurations Options Smart Switch Only ModeDescription Command Summary Three Character Command FormatFour 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 Chapter 3 PORT CONNECTIONS DTE/DCE Explanation25 Pin DTE 25 Pin DCEMaster Port Connections Slave Port ConnectionsConnection Chapter 4 SETUP SOFTWAREIntroduction Software Installation Software UninstallSelect SETTINGS, CONTROL PANEL from the Windows START menu 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 ASCII Appendix A ASCII Character CodesDECIMAL to HEX to ASCII CONVERSION TABLE Appendix A Appendix B Cable Charts Pins 6, 8, & 20 looped back internally on the 232BSS4Chart B.1. DTE PC DB25 Connector to Master Port Chart B.2. DTE PC DB9 Connector to Master PortAppendix B Cable Charts Chart B.4. DCE Modem DB9 Connector to Master Port Pins 6, 8, & 20 looped back internally on the 232BSS4Chart B.3. DCE Modem DB25 Connector to Master Port Pins 1, 4, & 6 looped back internally on the 232BSS4 Chart B.5. Ports A - D DTE to DTE PC DB25 ConnectorChart B.6. Ports A - D DTE to DTE PC DB9 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 Appendix C Block Diagram MASTERUART UART UARTAppendix C Appendix D Declaration of Conformity DECLARATION OF CONFORMITY