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The Jablotron JA-121T module is a universal converter to RS-485 for other systems. It synchronizes the transfer from the JABLOTRON 100 system bus to the RS-485 serial line and back.
Used, for example, for the connection to an intelligent house. Contains galvanic isolation circuits sized for a test voltage of 4 kV. The data is sent, if the status changes, or on request. In passive mode, all data is sent on demand only. The module is addressable and occupies one position in the system.