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APPENDIX 2 DIGITAL INTERFACE
AP-8
Serial Interface
Baud rate is selectable from 4800 bps and 38400 bps. The serial interface complies with
IEC 61162-2.
Input port (RD-A, RD-B)
Output port (TD-A, TD-B)
LTC1535C
RD-A
GND
Isolated RS485 Transceiver
Logical High: A-B> +0.2V
Logical Low: A-B< -0.2V
RD-B
LTC1535C
TD-A
GND
Isolated RS485 Transceiver
Logical High: A-B> +0.2V
Logical Low: A-B< -0.2V
TD-B