B&B Electronics 232BSS4 manual Back to Back Operation mux/demux, 2. Back to Back Operation

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Back to Back Operation (mux/demux)

Back to Back Operation (mux/demux)

Printer

PC

Printer

Port A Port B Port C Port D

B&Belect ronics MANUFACTURING COMPANY www.bb-elec.com Ottawa, IL 61350 USA 232BSS4 +12 VDCMASTER PORT POWER

Direct Cable Connection

or

Modem Modem or

232BSS4 +12 VDCMASTER PORT POWER

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

B&B electMANUFACTURING COMPANYronics	A Port B Port C Port D
	Port

78.6 Measurement

78.6 Scale

78.6 Measurement

78.6 Scale

PC

RF Modem

RF Modem

Figure 2.2. Back to Back Operation

Two 232BSS4s can be connected together through their Master ports to provide a simple form of multiplexer/demultiplexer. Any Slave port on one switch can automatically send to one or more ports on the other over the single Master port communication channel. The setup software walks the user through the configuration and automatically sets the Slave port preambles.

When two 232BSS4s are connected for Back to Back operation, the Slave ports would typically be set up for a slower baud rate than the Master ports. If the Master ports will not be running at a baud rate at least four times the speed of the Slaves, or if the main Master channel will be connected over a slow communications channel such as through modems, all ports should be configured through the setup software to use hardware handshaking.

Hardware handshaking is automatically turned on for the Master ports when you configure the switches for back to back operation. If you are operating the switches with a direct cable connection or if your communications link does not require handshaking, this option can be turned off in the single unit configuration setup. 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. Because the Master ports are almost always connected to another DCE device, a null modem cable will probably be required. Refer to the cable charts in Appendix B for connecting the Master port to another DCE port.

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