Campbell Scientific COM320 Voice Communications Modem - Manual (Page 25)

COM320 Voice Communications Modem
For callback collection, the datalogger’s DialSequence instruction changes the
COM320 from default voice mode to data mode.
The commas create a delay so that the “9” is received by the COM320 during
the voice announcement. When the COM320 detects the “9” it disables voice
communications and enables data mode for the remainder of that connection.
For example, in LoggerNet, if the phone number is "555-4321" then in order to
call the COM320 and enable data mode the dial script becomes:
"555-4321,,,,,,9"
In LoggerNet a comma represents a 2 second delay. You may need to adjust
the number of commas so that the “9” occurs during the voice announcement,
depending upon the length of time required to establish the connection with the
modem. The COM320 must be speaking when the “9” is sent.
6. Hardware Installation
6.1 Site Requirements
Connection to telephone company provided COIN service
(Central Office Implemented systems) is prohibited. Connection
to party line service is subject to state tariffs. NOTE
The COM320 is compatible with standard (analog) telephone lines. It
connects to the telephone line by means of a USOC RJ11C jack (standard
modular telephone jack). Connect the cable from the telephone RJ11C jack to
the modem as shown in Figure 2.
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