Campbell Scientific COM200 Telephone Modem - Manual (Page 13)

COM200 Telephone Modem
7
To comply with FCC Rules and Regulations, all repairs on the COM200
modem must be performed by Campbell Scientific, Inc. or an authorized agent
of Campbell Scientific, Inc. For assistance in installation, troubleshooting, or
for repair, contact Campbell Scientific:
Campbell Scientific, Inc.
815 West 1800 North
Logan, Utah 84321-1784
Telephone: (435) 753-2342
Fax: (435) 750-9540
Web site: www.campbellsci.com
5. Modem Settings in Non-Volatile Memory
The COM200 comes from the factory with the appropriate settings for most
applications. It is programmed to answer the call as soon as it detects the call.
One may modify the COM200’s settings in non-volatile memory using Hayes
AT commands. Appendix A describes the procedures and commands required
to make the changes described in this section.
Some of the settings one may change are:
Disable auto-answer: This option is used only when the modem is not to
answer a call. For example, the COM200 is connected to a telephone line
which is to be used part time for voice communication. In this situation it is
best to have the datalogger call the computer.
Answer on X th ring: This option is used when the modem is sharing a line and
you only want it to answer after a specified number of rings. For example, the
COM200 is sharing a line with people at an office. It can be programmed to
only answer after the 4
th ring. When the people know the call is for the weather
station, they will not pickup the telephone, and after 4 rings, the datalogger
will pick it up.
Change telephone system types: Change from the Bell 212A (U.S. and
Canada) system to a CCITT V.32 (foreign, 9600 baud) or CCITT V.22
(foreign, 1200 baud) system. This does not mean that the COM200 is tested
and approved for all foreign countries.
CCITT is an international consultative committee that sets international
communications usage standards. V.32 and V.22 are standards that the
COM200 meets.