If a phone line is shared with a seismograph that transmits data when it is called from a computer, is it possible to avoid interference by having the COM220 call out rather than transmit after receiving an outside call?

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.

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