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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
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
Back to Back Operation (mux/demux)
Scale
Measurement
Modem
Printer
Printer
PC
PC
78.6
78.6
Scale
78.6
78.6
Measurement
Modem
Direct Cable Connection
RF Modem
or
or
RF Modem
Port A Port B Port C Port D
MASTER PORT
232BSS4
+12 VDC
POWER
B
B
&
elect roni cs
MANUFACTURING COMPANY
www. bb-elec. com Otta wa, IL 61 350 USA
Port A Port B Port C Port D
MASTER PORT
232BSS4
+12 VDC
POWER
B
B
&
elect ronics
MANUFACTURING COMPANY
www.bb-elec.com Ottawa, IL 61350 USA
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.