The COM220 phone modem enables communications between a computer and a Campbell Scientific datalogger over a public switched telephone network. A Hayes-compatible modem is required at the computer site. The COM220 connects to the datalogger at the field site. Most Campbell Scientific dataloggers are compatible.Read More
The COM220 has a CS I/O port, power terminals, screw terminals, and an RJ-11C jack. The datalogger connects with the CS I/O port via an SC12 or SC12R-6 cable. The RJ-11C jack is for attaching a surge-protected telephone line. Alternatively, the screw terminals (GND, RING, TIP) can be used to connect the COM220 with a phone line via a surge protector.
|Operation||Full-duplex over standard analog phone lines|
|Operating Voltage||12 Vdc|
|Communication Rate||9600, 38400, 57600, 115200 bps (between datalogger and COM220, and selected by user)|
|Operating Temperature Range||
|Standards||V.92, K56Flex, V.90, V.34, V.32bis, V32, V23, V22bis, V22, V.21, B212, B103|
|Dimensions||16.5 x 2.5 x 6.6 cm (6.5 x 1.0 x 2.6 in.)|
|Weight||0.16 kg (0.35 lb)|
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Typically, a length of phone line is run from the telephone company's junction box to the COM220s surge protector, and then to the Ground, Tip, and Ring terminals on the COM220. Alternately, if adequate surge protection is provided by the telephone company and the junction box supports it, a length of telephone wire with RJ11C connectors (pn 2365) can be run directly from the junction box to the socket on the COM220.
Default settings are not compatible for non-PakBus dataloggers (i.e., CR5000, CR7, retired dataloggers). For these dataloggers, the DIP switch settings must be changed; refer to the COM220 manual for details.
An SC12 cable is provided for connecting the COM220 with the datalogger.
LoggerNet and PC400 software packages support use of the COM220 with our dataloggers. Both of these software packages support automated error-checking or user-initiated contacts. LoggerNet also supports scheduled contact times. Our software can run unattended allowing the user to take advantage of lower off-hour telephone rates.
The COM220 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the COM220 to the backplate of our enclosures.
Execution of this download installs the COM220 Operating System on your computer.
Note: The Device Configuration Utility is used to upload the included operating system to the COM220.
Number of FAQs related to COM220: 14
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Cable runs of that length usually will require a booster of some sort. Contact the local phone company for recommendations.
Not directly. A datalogger needs to be used with it, and the remote caller needs to be running LoggerNet or PC400.
The COM220 and the radio can coexist on the CS I/O port provided that they are assigned two different SDC addresses.
No. The COM220 is designed to pick up a call and cannot be overridden. A better approach would be to use a phone line sharing device. Note that the phone line sharing device must simulate a normal phone line accurately or it won’t work correctly with the COM220.
One phone line sharing device that has been used successfully by our customers is “The Stick” by Multi-Link. This device takes one incoming phone line and breaks it out to four separate lines. It does require ac power to run. For more information, refer to the Multi-Link website.
Typically, software such as LoggerNet or PC400 is needed to connect to a datalogger and download the data.
There are several possibilities as to the cause. Contact Campbell Scientific for assistance in determining the specific cause.
Campbell Scientific does not recommend VoIP, as it does not work well with data transfers.