Operation
4-4
Closing and opening channels
A channel is closed from the front panel by simply keying in
the channel assignment and pressing CLOSE. For example,
to close channel 6 (input 6 of bank B) of a multiplexer card
installed in slot 2, key in the following channel list and press
CLOSE:
SELECT CHANNELS 2!6
The above closed channel can be opened by pressing OPEN
or OPEN ALL. The OPEN key opens only the channels spec-
ified in the channel list, and OPEN ALL turns off (opens) all
channels.
NOTE
For the Model 7002 mainframe, you can
use the light pen to turn output channels on
and off.
The following display is an example of a channel list that
consists of several channels:
SELECT CHANNELS 2!1, 2!3, 2!22-2!25
Notice that channel entries are separated by commas (,). A
comma is inserted by pressing ENTER or the right cursor
key (
). The channel range is specified by using the hyphen
(-) key to separate the range limits. Pressing CLOSE will
close all the channels specified in the channel list. Pressing
OPEN (or OPEN ALL) will open the channels.
Channel patterns can also be used in a channel list. This
allows you to control unique relay patterns. Example:
SELECT CHANNELS 2!1, M1
Pressing CLOSE will close channel 2!1 and the channels that
make up channel pattern M1. Refer to the mainframe instruc-
tion manual for information on defining channel patterns.
Scanning channels
Multiplexer channels are scanned by creating a scan list and
configuring the Model 7001/7002 to perform a scan. The
scan list is created in the same manner as a channel list (See
the previous Closing and opening channels paragraph).
However, the scan list is specified from the SCAN CHAN-
NELS display mode. (The SCAN LIST key toggles between
the channel list and the scan list.) The following shows an
example of a scan list:
SCAN CHANNELS 2!1, 2!3, 2!21-2!25
When a scan is performed, the channels specified in the scan
list will be scanned in the order that they are presented in the
scan list.
Channel patterns can also be used in a scan list. This allows
you to scan unique relay patterns. Example:
SCAN CHANNELS M1, M2, M3, M4
When M1 is scanned, the channels that make up channel pat-
tern M1 will close. When M2 is scanned, the M1 channels
will open and the channels that make up M2 will close. M3
and M4 are scanned in a similar manner. Refer to the instruc-
tion manual for the mainframe for information on defining
channel patterns.
A manual scan can be performed by using the RESET
default conditions of the Model 7001/7002. RESET is
selected from the SAVESETUP menu of the main MENU.
When RESET is performed, the mainframe is configured for
an infinite number of manual scans. The first press of STEP
takes the mainframe out of the idle state. The next press of
STEP will close the first channel specified in the scan list.
Each subsequent press of STEP will select the next channel
in the scan list.
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