Specifications

COM220 Telephone Modem
The COM220 is connected to a CSI datalogger by a 9-pin subminiature D
cable. This is the same 9-pin CS I/O interface common to all Campbell
Scientific dataloggers (except the CR200 series). This is not an RS-232
connection. Appendix B describes the CS I/O interface.
The COM220 can be used as an originate modem at the datalogger site. For
newer Pakbus dataloggers (e.g., CR800, CR1000, CR3000) use the
ModemCallback instruction or the DialSequence and DialModem instructions
to program the datalogger to originate a call to the computer. For non-Pakbus
dataloggers (e.g., CR510, CR10X, CR23X), and for older PakBus dataloggers
(e.g. CR10XPB, CR23XPB, CR510PB) use Instruction 97 to program the
datalogger to originate a call to the computer. Refer to your datalogger manual
and LoggerNet Help files for detailed descriptions of these instructions. In
addition, Appendix A.4 includes sample programs for the ModemCallback,
DialModem, and P97 instructions.
The COM220 features a built-in speaker to allow monitoring of calling and
connection. See Appendix A.2 for the Hayes AT commands that affect the
speaker on/off and volume settings.
FIGURE 2. COM220
1.2 Computer Requirements
A Hayes-compatible modem is used at the computer site with Campbell
Scientific computer software to call the datalogger attached to the COM220.
The computer’s modem must be configured to the proper settings using a set of
modem initialization strings in the software program’s pick list.
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