In addition, there are some system characteristics
that are set with the eighth DIP switch of the
individual port switch banks. Sections 3.6 and 3.7
explain these functions in depth.
3.4 Bank Assignments
The individual port switch banks are assigned as
follows:
Bank Label Port
SWA Master Device Port
SWB 0
SWC 1
SWD 2
SWE 3
The Four-Port Expansion Board provides these
additional banks:
Bank Label Port
SWH 4
SWI 5
SWJ 6
SWK 7
3.5 Configuring Ports with the Individual Port
Switch Banks
To set the switch banks, use a small screwdriver or
other small object with a clean edge or point. The
individual port switch banks are identical in
function, and the set of charts provided on the
following pages applies to all of them.
3.5.1 P
ORT SPEED (SWITCHES 1, 2, AND 3)
Speed Set Switches
123
110 bps ON ON ON
300 bps OFF ON ON
600 bps ON OFF ON
1200 bps OFF OFF ON
2400 bps ON ON OFF
4800 bps OFF ON OFF
9600 bps ON OFF OFF
19200 bps OFF OFF OFF
3.5.2 PARITY (SWITCHES 4 AND 5)
Parity Set Switch
45
Even OFF ON
Odd ON OFF
None OFF OFF
3.5.3 WORD SIZE (SWITCH 6)
Size Set Switch 6
7 bits per word OFF
8 bits per word ON
3.5.4 FLOW CONTROL (SWITCH 7)
Flow Control Set Switch 7
Hardware (DTR/CTS) ON
Software (X-ON/X-OFF) OFF
3.6 Setting Global Characteristics with the
System Switch Banks
Refer to the explanations and the charts below to
set the system switch banks SWF and SWG.
3.6.1 FUNCTIONS OF SWITCH BANK SWF
Responsibility for the Link Command
When the COS II receives a control code sequence
from the proper device, it will establish a
communications link between the master port and
one of the slave ports. If it then receives the lockout
character—a character with a value of 38 in
hexadecimal—it will ignore the remaining unlinked
subordinate ports. For more information on links
and lockouts, see Sections 4.2 and 4.3.
You can set the Switch to accept the command to
link from only the master port, only a slave port, or
from either the master or a slave port. Switches
SWF 1 and SWF 2 designate the origin of the link.
Set SWF
Origin of Command 1 2
master ON ON
slave OFF ON
either master or slave ON or OFF OFF
NOTE: If the slave ports are set up for hardware
flow control, or if DTR/CTS pass-through is
enabled, you should set the Switch to
accept a link command from the master port
only.
8
CODE OPERATED SWITCH II
