ZKTeco KR903 Access Control Reader — Wiegand + RS485

The ZKTeco KR903 is an RFID access-control reader for presenting credentials to a compatible controller or standalone access device. It reads supported 125 kHz ID and 13.56 MHz IC credentials, allowing the installation to accommodate more than one card technology. The reader supplies identification data; it does not by itself establish the access permissions or provide the complete hardware needed to operate a door.

This model has no physical keypad and is documented for card identification. Choose it when a card-based reader is required without local password input. Its documented dimensions are 86 × 86 × 16.15 mm, and it is intended for mounting on a compatible Asian gang box or a suitable flat surface. That mechanical format is a useful selection difference within the KR900 range, especially when replacing a reader on an existing frame or back box. Match the mounting arrangement and the actual credential type before choosing the model.

The manufacturer describes a Wiegand-and-RS485 option using ZK-RS485. The supplier listing also mentions OSDP, but exact-model official confirmation of that protocol and its revision is not established. A 9–12 V DC supply is listed for the family, together with LED status indications, a buzzer and a tamper switch. The enclosure is rated IP65, with indoor and outdoor use documented by the manufacturer. Installation still needs appropriate cabling, supply and controller integration. Specify the exact communication version and any separate controller, lock and power components as part of the complete access-control design.