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4.5 Module Replacement
4
Figure 4-9 Replacing 10BASE5 Modules (EN711, EN721)
4.5.2 10BASE2 (EN731, EN741)
(1) Switch off the base unit. Check the LED indications to make sure that the power is
off.
Turn the T-adapter on the EN7 module counterclockwise to unlock it, then remove it.
Never disconnect the 10BASE2 cable (3D-2V) cable from the T-adapter.
If a dual Ethernet module (EN721) is used, disconnect the T-adapters for both buses
A and B.
(2) Loosen the M4 screws on top and bottom of the module, using a Phillips screwdriver,
and remove the module along the module guide of the base unit.
(3) Set the switches on the new EN7 in the same way as those on the removed EN7.
(4) Install the new EN7 in the base unit and connect the 10BASE2 cable to it. For how to
install a new EN7, refer to the instructions for Ethernet cable connection described in
the preceding section on installation.
EN7 module
Slide lock
AUI cable
Base unit
Remove it after checking
Disconnect +12 V power
Module guide for
base unit
(Push up slide lock to
disconnect the cable.)
that unit power is off.
cable after switching
power off.
CAUTION
• When replacing a 10BASE2 module (EN731 or EN741), do not disconnect the 10BASE2
cable (3D-2V) from the T-adapter. If it is disconnected, the trunk line of the surveillance and
control network will be disconnected, causing an transmission error.
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