Operator's Manual

APPENDIX 4 DIGITAL INTERFACE
AP-14
Serial Interface
Baud rate is selectable from 4800 bps and 38400 bps. Complies with IEC 61162-2.
Input port (RD-A, RD-B)
Output port (TD-A, TD-B)
PC400
RD-
A
GND
Photo Coupler
Logical High: A-B> +0.2V
Logical Low: A-B< -0.2V
RD-B
SN65LBC176
TD-
A
GND
RS485 Transceiver
Logical High: A-B> +0.2V
Logical Low: A-B< -0.2V
TD-B