Specifications

COM220 Telephone Modem
FIGURE 6. Side View of Surge Suppressor Wiring
4. Modem Settings
The COM220 is shipped from the factory with default settings that support
PakBus dataloggers (e.g., CR800, CR1000, CR3000, 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 (e.g., CR510,
CR10X, CR23X, CR7, CR5000). However, compatibility
with non-PakBus dataloggers is easily achieved by
changing DIP switch settings (Figure 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). In addition, DIP switch 5 must be closed for
connection to non-PakBus dataloggers. Instructions for
configuring the COM220 are described in Appendix A.
IMPORTANT
You can modify the following COM220 settings with DIP switches:
1) Communication mode (e.g., SDC or Modem Enable)
2) ME baud rate
3) PakBus ready
Additional changes (see examples below) may be modified with Hayes AT
commands. Appendix A.2 describes the procedures and commands required to
effect the changes described in this section.
8