Connecting The Serial Port - Patton electronics NetLink 1094A User Manual

4.2 CONNECTING THE SERIAL PORT

The serial port interface on the Model 1094A uses interchange-
able QuikConnect™ Modules. Each QuikConnect™ Module has a
50-pin card edge connector on one side and a serial port interface on
the other. Figure 4 below shows how a QuikConnect™ Module plugs
into the back of the Model 1094A.
Figure 4. Installation of Model 1094A Plug-in Serial Interface Module
4.2.1 Changing QuikConnect™ Modules
When you purchase a particular version of the Model 1094A, it
should be shipped to you with the appropriate QuikConnect™ Module
already installed. If you need to install a different QuikConnect™
Module, follow these steps:
Removing the Existing QuikConnect™ Module
1) Turn the power switch off. Leave the power cord plugged into
a grounded outlet to keep the unit grounded.
2) Loosen the two thumbscrews on the module by turning them
counterclockwise.
3) Grasp the two thumbscrews and gently pull the module from
the unit. Apply equal force to the thumbscrews to keep the
module straight during the removal process
Installing the New QuikConnect™ Module
1) Make sure the power switch is off. Leave the power cord
plugged into a grounded outlet to keep the unit grounded.
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2) Hold the module with the faceplate toward you and align the
module with the guide slots in the rear panel of the Model
1094A.
3) While keeping the module's faceplate parallel with the Model
1094A rear panel, slide the module straight in – so that the
card edge contacts line up with the socket inside the chassis.
NOTE:
The card edge connector should meet the socket when
it is almost all the way into the chassis. If you encounter a lot of
resistance, remove the module and repeat steps 2 & 3.
4) With the card edge contacts aligned with the socket, firmly seat
the module by using your thumbs to apply pressure directly to
the right and left edges of the module faceplate. Applying
moderate and even pressure should be sufficient to seat the
module. You should hear it "click" into place.
5) To secure the module in place, push the thumbscrews into the
chassis and turn the screws clockwise to tighten.
4.2.2 Connecting to a "DTE" Device
The serial port on most QuikConnect™ interface modules (all
except the X.21 module) is hard-wired as a DCE. Therefore these
modules "want" to plug into a DTE such as a terminal, PC or host.
When making the connection to your DTE device, use a straight
through cable of the shortest possible length—we recommend 6 feet
or less. When purchasing or constructing an interface cable, please
refer to the pin diagrams in Appendix C as a guide.
4.2.3 Connecting to a "DCE" Device
If the Model 1094A's QuikConnect™ interface module is hard-
wired as a DCE (all except the X.21 module), you must use a null
modem cable when connecting to a modem, multiplexer or other DCE
device. This cable should be of the shortest possible length—we rec-
ommend 6 feet or less. When purchasing or constructing a null
modem interface cable, use the pin diagrams in Appendix C as a
guide.
NOTE:
Pin-out requirements for null modem applications
vary widely between manufacturers. If you have any questions
about a specific application, contact Patton Electronics
Technical Support.
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