DS-6904UDI(C)

Manufacturer reference

Manufacturer details describe the cited version. Confirm the exact unit and intended system.

Interface

Alarm In

8-ch alarm in

Alarm Out

8-ch alarm out

Serial Interface

RS-232 (RJ45) × 1, RS-485 × 1

USB Interface

USB 2.0 × 2

Network Interface

10 M/100 M/1000 Mbps self-adaptive Ethernet; 2 optical interfaces, 100 base-FX/1000 base-X; optoelectronic self-adaptation

Video Wall

Video Walls

1

Video Wall Size

≤4

Split Window

yes

Scenes

64

Scene Auto-Switch Delay

3 s

Split Screen

1, 2, 4, 6, 8, 9, 12, 16, 25

Background Images

Background color only

Subtitles

N/A (optional to support)

Delay of Displaying Local Signal Source on Video Wall

120 ms

Delay of Displaying Decoded Signal Source on Video Wall

120 ms

Auto-Switching Plans

Support 256 auto-switching plans

General

Working Temperature

-10 °C to 55 °C (14 °F to 131 °F)

Working Humidity

10% RH to 90% RH

Net Weight

< 5.18 kg (11.42 lb)

Gross Weight

5.18 kg (11.42 lb)

Power Consumption

< 50 W

Packing List

Decoder × 1; DB15M to 4 × BNC (4-ch CVBS Video Patch Wire) × 1; Quick Start Guide × 1; Regulatory Compliance and Safety Information × 1; Hanger × 1; Power Cord × 1; Mat × 4; Grounding Wire × 1

Power Supply

100 to 240 VAC

Audio Input

Audio Input Interfaces

2

Audio Input Interface Type

embedded HDMI audio input

HDMI Audio Input Precision

16 bit; 48 kHz; 2-channel stereo

Video Input

Video Input Resolution

3840 × 2160@30 Hz, 1920 × 1080@50 Hz, 1920 × 1080@60 Hz, 1280 × 720@50/60 Hz

Video Input Interface Type

2-ch: HDMI 1.4

Video Input Interfaces

2

Max. Video Input Resolution

4K

Video Encoding

Video Encoding Format

H.265/H.264 Default H.264

Video Encoding Channel

2

Video Encoding Performance

1-ch 4K@30 Hz or 2-ch 1080p@50/60 Hz

Audio Encoding

Audio Encoding Format

G722.1, G711U, G711A, AAC-LC

Video Output

Max. Video Output Resolution

4K

Video Output Interface Type

HDMI 1.4

Video Output Interfaces

4

Video Output Resolution

3840 × 2160@30 Hz, 2560 × 1440@30 Hz, 1920 × 1200@60 Hz, 1920 × 1080@60 Hz, 1920 × 1080@50 Hz, 1680 × 1050@60 Hz, 1600 × 1200@60 Hz, 1280 × 1024@60 Hz, 1280 × 720@60 Hz, 1280 × 720@50 Hz, 1024 × 768@60 Hz

Video Output Resolution (BNC)

PAL: 704 × 576@25 Hz, NTSC: 704 × 480@30 Hz

Video Output Interface (BNC)

1-ch: DB15 to BNC

Video Decoding

Video Decoding Format

H.264, H.265, SmartH.264, SmartH.265, MJPEG

Video Decoding Resolution

Up to 32 MP

Video Decoding Channels

64

Video Decoding Capability

Support 2-ch 32 MP/24 MP/4-ch 12 MP/8-ch 8 MP/10-ch 6 MP/16-ch 4 MP/32-ch 1080p/64-ch 720p and below real-time decoding(4 outputs in a group, sharing decoding capabilities)

Audio Output

Audio Output Interface Type

embedded HDMI audio output or DB15 to BNC independent audio output

Audio Output Interfaces

4

Encoding and Decoding

Audio Decoding Format

G711A, G711U, G722.1, G726-16/U/A, MPEG, AAC-LC, PCM

Functions

Decoding Modes

Active and passive decoding

Network Protocol Access

ONVIF and GB28181

Network Video Live View

RTP/RTSP

Time Synchronization

NTP or manual

Video Wall Controls

Splicing, window opening, roaming, scene switching and window switching

Client Access

PC client and Web client

Remote Maintenance

Remote restart, restore defaults and upgrade

User Permissions

Resource and video-wall module permissions

Selection notes

• The documented specifications apply to the cited manufacturer version. Confirm the supplied hardware, firmware and accessory configuration.
• Specifications follow Hikvision exact (C) manufacturer datasheet, 2024-08-06. Exact original model and hardware suffix retained. Confirm supplied regional unit and accessories. Manufacturer prints 1.5 layers at 4K without explaining a fractional-window allocation. No rounded or per-port 4K layer capacity inferred. The aggregate formula depends on the undefined 1.5-layer 4K allocation, so no total layer count is calculated or published. The labelled W/H/D tuple places the long enclosure depth in the height position relative to the product drawing. No axis swap or dimensions from another revision substituted. Specification table states 1 RJ45 interface but the physical-interface page lists G1 and G2. Port quantity remains unconfirmed. Packing list says four BNC connectors and eight audio channels for one cable. Exact cable connector/channel description withheld. Frame-synchronization marketing text does not establish zero latency; the explicitly listed delay values are retained where applicable.
• Readers, locks, power supplies, batteries, licences and other accessories are not assumed to be included. ISD confirms specification, compatibility, supply, price, lead time and local warranty separately.

Official documents

• Hikvision DS-6904UDI(C) manufacturer reference

Manufacturer source checked 2026-09-10. The supplied unit and local terms require confirmation.