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GEFEN, Switchers

GTB-HD4K2K-848-BLK

Control
IP, RS-232 (default TCP)
Encoding
ASCII
IP
Telnet port 23
RS-232
19200 baud, 8N1
Line ending
CRLF
Roles
Switcher
More from this makerGTB-HD4K2K-444-BLK

Commands

9 commands
MUTE2
VIDEO MUTE ON #mask %o
Ending: crlf
VIDEO MUTE OFF #unmask %o
Ending: crlf
ROUTING7
SEND IN TO OUT r %n %o
Ending: crlf
OUT1 IN1 r 1 A
Ending: crlf
OUT1 IN2 r 2 A
Ending: crlf
OUT1 IN3 r 3 A
Ending: crlf
OUT1 IN4 r 4 A
Ending: crlf
AV SWITCH r %n %o
Ending: crlf
VIDEO SWITCH r %n %o
Ending: crlf

Cheat sheet

driver.cheatSheet()

What it is

The Gefen ToolBox 4K Ultra HD 8x8 HDMI Matrix provides a compact and powerful solution for routing high-definition video and audio. This professional HDMI switcher allows you to connect up to eight 4K Ultra HD sources and distribute them independently to any of eight 4K displays.

Specs

Resolution: up to 4K DCI (4096 x 2160 at 24 Hz), 4K Ultra HD (3860 x 2160 at 60 Hz, 4:2:0 color space), 1080p Full HD, and 1920x1200 WUXGA

Frame Rate: 60 Hz (for 4K Ultra HD)

Signal Type: HDMI 2.0, HDCP 1.4

Inputs: 8 x HDMI Type A, 19-pin, female, locking

Outputs: 8 x HDMI Type A, 19-pin, female, locking

Setup

First Use: Connect up to eight source devices to inputs and eight displays to outputs.

Video Optimization: Enable Fast Switching Technology (FST) per input for improved switching. Each HDMI input can be set to fast or slow mode.

Control: Front-panel buttons, IR remote, RS-232, IP (Telnet, UDP, web server).

Support

Tech Support Phone: (818) 772-9100, (800) 545-6900

Tech Support Email: support@gefen.com

Power Cycle: Reboot the matrix by cycling power.

Factory Reset: Use the #fadefault command via RS-232/Telnet or the "Set Defaults" button in the Web GUI under Configuration > Change IP Settings.

About this driver

driver.source()

Confirm each command on your device before you rely on it. Provided as is, with no warranty. To correct something or ask for it to come down, write to info@ctrlbot.io. Licensed CC BY 4.0: credit CTRLbot and link back when you share it. Product page. Manufacturer site.

Revision
1
Updated
2026-11-05
Catalog date
2026-11-12
License
CC-BY-4.0