Campbell Scientific COM220 56k Phone Modem - Manual (Page 17)

COM220 Telephone Modem
FIGURE 3-4. Side view of surge-suppressor wiring
4. Modem Settings
The COM220 is shipped from the factory with default settings that support
PakBus dataloggers (such as the CR800, CR1000, CR3000, and CR10XPB).
The modem comes configured for synchronous device communication (SDC7),
and, if using a PakBus datalogger, can answer a call as soon as a call is
detected.
Default settings must be changed if using a non-PakBus datalogger.
The default settings ARE NOT compatible with dataloggers
that have non-PakBus operating systems (such as the
CR510, CR10X, CR23X, CR7, and CR5000). However,
compatibility with non-PakBus dataloggers is easily
achieved by changing DIP-switch settings (FIGURE 1-1). If
you want to use the COM220 as a drop-in replacement for
the COM210, the COM220 settings should be changed to
modem enable (DIP switch 1 open) and 9600 baud (DIP
switches 3 and 4 open). Instructions for configuring the
COM220 are described in Appendix A, Changing COM200
Settings.
You can modify the following COM220 settings with DIP switches:
1) Communication mode (SDC or ME)
2) ME baud rate
Additional changes (see examples below) may be modified with Hayes AT
commands. Appendix A.2, Hayes AT Commands, describes the procedures
and commands required to effect the changes described in this section.
IMPORTANT
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