Rockwell Automation T7150A Regent+Plus Communications Modules RS-232, RS-422 and RS-485 - Manual (Page 18)

Communications Modules (T7150A)
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Industrial Control Services
From the right side of the module, align the four holes in the
printed circuit board wit four metal standoffs. Insert and
tighten the four screws removed from the right side of the
module.
Turn the module over and install the two screws removed from
the left side of the module.
Visually inspect the connector at the back of the
communications module for bent pins. If any pins are bent do
not install the module. Do not try to straighten bent pins.
Return the module to ICS for replacement.
If the pins are in good condition, hold the module with both
hands and open the two module release levers by pulling them
toward you.
Carefully slide the module into the chassis. Be careful to keep
the module aligned while sliding it straight into the chassis.
The module should mount into the chassis with a minimum of
resistance. If the module does not mount easily, do not force
it. Remove it and check it for bent or damaged pins. If the
pins look okay, try reinstalling the module.
When the module is almost fully into the chassis, the release
levers will contact the chassis and begin to rotate closed.
Press the levers closed to seat the module in the chassis.
The top release lever on each communications module is
switched. When the lever is in the open position, the module
is disabled.
If the module does not seem to have seated correctly, open the
release levers and gently pull it back off the seat and out of
the chassis. Check for bent or damaged pins. If the pins look
okay, try reinstalling the module.
After the module is properly seated, tighten the retaining
screw at the top of the module. Fastening the retaining screw
will also help ensure that top (switched) release lever remains
in position.