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LTRx-512 Installation and User’s Guide
Installing the Modem
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APPENDIX E – INSTALL THE OPTIONAL MODEM
Installation of the optional internal modem should be performed by a trained and competent electronics
technician. Follow these steps;
1. Turn off the power to the Master Clock. You can either access the on/off switch inside the Power
Supply Box or turn off the power at the source.
2. Remove the four (4) screws from the sides of the Display Unit.
3. Gently remove the cover of the Display Unit. Some adhesive may hold the cover to the display and
keypad. A gentle pull should have the cover pull free.
4. Locate the large rectangular hole in the circuit board just to the right of the display.
5. Carefully insert the modem into the sockets on each side of the opening. The modem goes in with the
transformer on the modem board at the top of the board.
6. Replace the cover and secure it with the four (4) screws.
7. Connect a working ANALOG telephone line to the telephone jack on the back of the display unit.
8. Replace the Master Clock to its original position and restore power.
9. Setup the Communications on the Master Clock. Press [#][9][0][0][#] and ensure that the baud rate is
at 9600 and verify the ID# of this Master Clock.
10. Setup your LTR MasterLink software to communicate with a modem clock and test the connection.
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MODEM
Installed