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CHAPTER 5: Operation
5.1 Power-Up
As soon as you provide power to the High-Speed COS-4 or High Speed
COS-8 (see
Section 4.3
), the unit will power up (“turn on”), make its default
connection to Port 1, and perform its minimal self-test. If position 6 of DIP
switch SW1 inside the COS is set to OFF (down), the COS will be ready to
operate normally. If position 6 is set to ON (up), the COS will begin
sending its barber-pole self-test (see
Section 5.3
) out of Port 1.
5.2 Switching
At any time, you can switch which port (and which attached “slave” or
“destination” device) your “master” device (the one on the common port)
has access to. Do this by sending the currently active arming code (see
Section 3.3
), followed by the character correpsonding to the number of the
desired port (“1” through “4” for the High Speed COS-4 or “1” through “8”
for the High Speed COS-8), from the master device.
You can also connect the master to all slaves (to send “broadcast” data to
all ports) by sending the arming code followed by the number “9”. While
the COS is in this setting, however, there is no flow control or port
contention among the slaves, and if more than one of them sends data at
the same time, it will become hopelessly intermixed and garbled.
Finally, you can disconnect the master from all slaves by sending the
arming code followed by the number “0” (zero). While the COS is in this
setting, no data sent by any attached device will be passed to any other device.
The COS-4 and COS-8 have three switching modes: Text, Graphics, and
Transparent. While the COS’s front-panel “Mode” switch is in the TX
(Text, left-hand) position, the COS operates in Text mode: The arming
code and port character are recognized without a preceding pause. While
the COS is in Text mode, its MODE LED is dark.
If you are using Text mode and you find that unwanted switching is
occurring, move the COS’s front-panel Mode switch to the GR (Graphics,
center) position. In Graphics mode, a pause must occur before the arming
code is recognized, so incidental occurrences of the arming code and the
port character among data do not cause the COS to switch as readily. While
the COS is in Graphics mode, its MODE LED is dark.
5. Operation
Summary of Contents for High Speed COS-4
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