The board layout for the Four-Port Expansion
Board is shown on this page (Fig. 2). If you have
ordered one, check your Board to make sure it
matches.
NOTE: Every time you change the DIP switch
settings, you must press the reset button
located on the front panel of the switch, or
unplug the power supply. The COS-II will not
process any data during a reset.
A note on charts: you’ll find all the charts printed in
this chapter duplicated either in the Appendix or in
the Quick Reference Guide.
3.3 Functions and Arrangement of the Switch
Banks
On the standard board there are seven banks of DIP
switches, of which five control the characteristics of
the individual ports (SWA through SWE). The
remaining two banks (SWF, SWG) control options
that affect the entire system. The Four-Port
Expansion Board adds individual port banks SWH
through SWK.
A note on terminology: This manual will use the
following system to designate individual switches
within each switch bank. The bank label will be
given first, followed by a hyphen and then the
number of the DIP switch. “SWA-6” refers to the
sixth DIP switch of Switch Bank A. Also, the words
“ON” and “OFF” are used in the switch charts, but
your banks may have the words “CLOSED” and
“OPEN” printed instead. “CLOSED” is equivalent
to “ON,” and “OPEN” is equivalent to “OFF.”
You’ll set the following options with Switch Banks
SWA through SWE (the individual port banks):
• Data rates, from 110 to 19,200 bps
• Parity—even, odd, or no parity
• Word sizes —7 or 8 bits
• Flow control by hardware (DTR/CTS) or
software (X-ON/X-OFF).
Section 3.4 covers these banks in more detail.
The two banks SWF and SWG (system banks)
regulate:
• Responsibility for the Link Command (from
master or slave port)
• Automatic timeout period
• Length of pause in Graphics Mode
• Lead Pass-Through
• Arming character
