ZKTeco OP-400, Quick Start Manual

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6 OP-400 Quick Start Guide
1.6 RS485 Connection

OSDP Connection
Important Notes:
1) For RS485 communication use shielded twisted pair wire.
2) To minimize chance of signal interference with RS485 communication, it’s
recommended using a bus topology instead of star topology.
3) Adjust the communication speed as needed. The signal strength varies
depending on wiring conditions, and it may be necessary to lower the baud
rates.
4) The GND Signal may be omitted if and only if the GND potential difference is
less than ±5V.
Controller panel
GND
485A 485B
GND
D0 D1