Campbell Scientific COM220 56k Phone Modem - Manual (Page 10)

COM220 Telephone Modem
TABLE 1-1. Default DIP Switch Settings
DIP Switch Default Setting
1 Closed
2 Open
3 Closed
4 Closed
5 Open
6 Open
7 Open
8 Open
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, CS I/O Connection, describes the CS I/O interface.
The COM220 can be used as an originate modem at the datalogger site. For
newer PakBus dataloggers (for example, 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 (for example, CR510, CR10X, CR23X) and older PakBus
dataloggers (for example, 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, Program Examples, 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, Hayes AT Commands, for the Hayes AT
commands that affect the speaker on/off and volume settings.
FIGURE 1-2. COM220
2