Model 2701 User’s Manual Close/Open Switching Module Channels 2-19
OPEN key
The OPEN key has two options to open channels: ALL and MULTI. The ALL option
simply opens all channels in the mainframe. The MULTI option opens only the specified
channel. All other closed channels remain closed. Figure 2-7 summarizes OPEN key
operation.
OPEN: ALL — Perform the following steps to open all channels in the mainframe:
1. Press the OPEN key to display “OPEN: ALL.”
2. Press OPEN again (or press ENTER) to open all channels.
OPEN: MULTI — Perform the following steps to open only the specified channel:
1. Press the OPEN key. The “OPEN: ALL” message will be displayed.
2. Press the
or key to display the “OPEN: MULTI” message.
3. Press ENTER to display the prompt to open a channel (OPEN MLT:XXX).
4. Using , , , and , key in the three-digit channel you want to select.
5. Press ENTER to open the channel.
NOTE If the channel you open using OPEN: MULTI is the system channel (channel
number displayed on the Model 2701), the channel will open, but the system
channel number will still be displayed (see “Multiple channel operation
anomalies,” page 2-22).
Figure 2-7
Multiple channel operation — opening one or all channels
CLOSEOPEN
Press OPEN key
OPEN: MULTI
OPEN: ALL
Display MULTI option
and press ENTER
OPEN MULT:XXX
Specify channel number
(XXX) and press ENTER
Display ALL option
and press OPEN again
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