Overview
The Hikvision DS‑K2704X is an Ultra Series networked access controller for centralised management of up to 4 doors natively and expandable to 128 doors via DS‑K2M002X modules. It supports web‑based configuration (no separate PC application needed), multi‑factor authentication, multi‑door interlocking, anti‑passback and robust downstream RS‑485 redundancy for improved communication stability.

• Native 4‑door control; expandable to 128 doors with DS‑K2M002X modules.
• Web‑based configuration and management — browser access without separate PC software.
• 5‑channel downstream RS‑485 design (4 communication + 1 redundancy) for stable module loops.
• High capacity storage: up to 100,000 users, 200,000 cards, 10,000 fingerprints and 600,000 events.
• Multiple I/O: lock outputs, exit buttons, door contacts, alarm I/O, tamper, Wiegand and RS‑485 reader interfaces, USB and fire interface.
• Backup battery charging/discharging support and diagnostic LEDs for power/comm/door status.

Use cases
Suitable for commercial and enterprise installations requiring centralised access control for small-to-large sites: office blocks, schools, retail premises, light industrial sites and multi‑door secure areas. Useful to systems integrators and installers deploying scalable networked access solutions.

Installation & safety
Designed for DIN‑rail/guide‑rail mounting. Confirm whether you supply the bare controller board (12 V DC input) or an enclosed kit with a built‑in PSU (AC input variants are offered by some resellers). Installation should be performed by a qualified installer. Always isolate power before wiring and follow local electrical regulations.

Compliance
Manufacturer datasheet available. Confirm CE / UKCA marking and local compliance with your supplier — certification status: INSUFFICIENT DATA.

Note: For exact mechanical dimensions, enclosure/kit details, and certification documentation, refer to the Hikvision datasheet and user manual supplied with the product.