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When connecting two Model 1090’s, it is necessary to use a crossover
cable. The diagram below shows how a crossover cable should be
constructed.
RJ-45 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 1-----------------------8 RCV-
XMT- 2-----------------------7 RCV+
GND* 4-----------------------5 GND*
GND* 5-----------------------4 GND*
RCV+ 7-----------------------2 XMT-
RCV- 8-----------------------1 XMT+
*Connection to ground is optional
4.2 CONNECTION TO THE SERIAL PORT
The serial port interface on the Model 1090 uses interchangeable
Quick Connect Modules. Each Quick Connect 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 Quick Connect™ Module plugs
into the back of the Model 1090.
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4.2.1 CHANGING QUICKCONNECT™ MODULES
When you purchase a particular version of the Model 1090, it
should be shipped to you with the appropriate QuickConnect™ Module
already installed. If you need to install a different QuickConnect™
Module, follow these steps.
Removing the Existing QuickConnect™ 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 QuickConnect™ Module
1. Make sure the power switch is off. Leave the power cord
plugged into a grounded outlet to keep the unit grounded.
2. Hold the module with the faceplate toward you and align the
module with the guide slots in the rear panel of the Model 1090.
3. While keeping the module’s faceplate parallel with the Model
1090 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 and 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 snap into place.
5. To secure the module in place, push the thumbscrews into the
chassis and turn the screws clockwise to tighten.
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0 OFF
1 ON
Line
Interface Port
Figure 4. Installation of Model 1090 Plug-in Serial Interface Module