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COM300 Voice Communication Modem
8
terms can be renamed to something more descriptive using LoggerTalk. A
dialog box to make these changes is invoked by selecting the Menu Strings
button from the main LoggerTalk window. Refer to the LoggerTalk on-line
help system for more information.
6.4 Using the COM300 to Hear Final Storage Data
Output data is normally stored in the datalogger's ring memory (Final Storage).
The COM300 can access data in input locations only; it cannot access Final
Storage data. In order to hear Final Storage data, it must be redirected to an
input location. This input location can then be accessed by the COM300.
Datalogger Instruction 80 is used to redirect output data to input locations.
Refer to the datalogger's operators manual for more information on this
instruction, and to Appendix G for an example program using P80.
7. Callback - Datalogger Initiated Calls
The datalogger can be programmed to initiate a call to one or more telephone
numbers when a specific condition is met. Typical use of this feature is for the
datalogger to call a computer running PC208W and transfer Final Storage data
to the computer. However, this feature can also be used with voice
communication. When callback is initiated, the datalogger will call the defined
telephone number(s) and a message will be announced. This is particularly
useful in alerting those monitoring the datalogger system of alarm conditions.
LoggerTalk's on-line help system includes a tutorial to guide you through
setting up a datalogger initiated voice callback. The datalogger's operators
manual also includes general information on the callback feature.
You can intermix voice and modem calls in the same program. Make sure you
are not using the same flag for a voice and a modem call.
8. Troubleshooting
8.1 For Problems Encountered When Making Voice Calls
1) Can you attach a normal analog telephone to the line and make a call out?
If not, contact your local telephone company. If you can make a call out
but the connection is poor or faint, contact your local telephone company.
2) Verify the COM300 is receiving 12 VDC. If the COM300 is receiving 12
VDC from a separate power supply instead of the datalogger, is the ground
of the separate power supply connected to the datalogger’s ground?
3) Verify the COM300 is the only Modem Enable device connected to the
datalogger. Other common Campbell Scientific modem enable devices are
the SC32A, some RF modems, and the MD9.
4) Verify the datalogger is turned on.
5) Verify the datalogger has power on its 5 V output.