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

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

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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
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78.6 Measurement

78.6 Scale

78.6 Measurement

78.6 Scale

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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 17

&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

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