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COM220 Telephone Modem
CAMPBELL
SCIENTIFIC
INC.
CR10
MADE IN USA
WIRING PANEL NO.
EARTH
DIFF
SE
AG H L AG H L AG H L AG GGE3 AG
4 5 6
78 910 1112
GGGG
12V 12V
SWITCHED
12V
G 12V
POWER
IN
SERIAL I/O
SE
DIFF
AG H L AG H L AG H L AG GGE1 E2
1 2 3
12 34 56
G 5V5VP1P2 C8C7C6C5C4C3C2C1
CONTROL
12V
SWITCHED
To Earth
Ground
14 AWG Ground Wire
SC12 Cable
Telephone Wall
Jack
Red
Black
(Ground)
(+12v)
FIGURE 4. CR10X with CR10 Wiring Panel and COM220 Using RJ11C Telephone Jack
4. Modem Settings
The COM220 comes from the factory with the appropriate settings for PakBus
dataloggers (e.g., CR8x0, CR1000, CR3000, CR10XPB, CR23XPB). It is
programmed to answer a call as soon as a call is detected. It is also
programmed for Synchronous Device Communication (SDC7). As mentioned
in the introduction, these settings must be modified in order to connect to older
dataloggers (e.g. CR510, CR10X, CR23X, CR7) with non-PakBus operating
systems.
6