Patton electronic 1094A user manual Connecting the Serial Port

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.

Port

Interface

1	ON
0	OFF

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.

11

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.

4.2.2Connecting 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.

12