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Clock Startup and Utility Software
6.6.2
Establishing a Serial Connection
NOTE:
To connect with the Model 1094B you must use a null-modem cable between the Model
1094B and computer; signals between Tx and Rx are crossed. Pin connections and functions are
as follows:
PC
–
1094B
3, Tx
–
2, RxD
2, Rx
–
3, TxD
5, Gnd
–
5, GND
For computers without a serial port, you will most likely need to use a USB to serial converter.
These devices normally associate a COM port number (on your computer) with the USB device.
For the Windows XP operating system, you may look this up as described on the next page.
From the 1094 Utility, select
Settings
>
Serial Port
>
COM #
, choosing the correct COM port
associated with your computer – see Figure 6.2. If your computer has its own serial port, choose
that one. If you are using a USB-to-Serial converter, choose the one that is associated with your
converter.
Make sure to go back and select
Settings
>
Baud Rate
, choosing the same baud rate as on the
Model 1094B. To check the baud rate on your Model 1094B, press the SETUP key on the clock; the
first menu should state, “SET SERIAL COM 1?”; press SETUP again and the second menu should
state “SET SERIAL COM 2?”. Press ENTER to verify the port parameters for either COM1 or
COM2.
Figure 6.2: Connecting with the 1094B
See the next page for information on identifying the COM port being used by your USB-to-Serial
adapter on your pc. The pc operating system in Figure 6.4 is Windows XP.