| 摘要 |
In order to identify a newly installed modem joining other modems which are already installed and established communications with a control unti, the newly installed modem generates, upon installation, a first logic state on an install detecting line which normally exhibits a second logic state. In response to the first logic state on the install detecting line, the control unit issues addresses which cover a predetermined maximum number of modems which can be managed by the control unit. The newly installed modem generates a reply signal in response to an address assigned thereto. The reply signal is sent to the control unit, and hence the control signal identifies the newly installed modem and is ready for establishing communication therewith.
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