So what kind of cable goes between this unit and an hdmi matrix? Rs 232 cable in the package has one end serial

You will need a phoenix RS232 cable on both ends to connect the matrix to the P8. The USB to RS232 cable is used to program commands to the P8 from the software. Jewel Support Team J-Tech Digital, Inc

Can I connect more than one of these to a device? I'd like to use them with a matrix switcher, but have need for two remotes.

Hello,As long as the device you're attempting to connect them to can accept more than one control panel, you can connect two to a single switcher. Kenny Support Team J-Tech Digital, Inc

So after it’s programmed, what cable do I use to connect with a jtech hdmi matrix?

Hello. You can use a RS232 cable, which comes pre-packaged with the unit. It is a white cable with an end that looks like an old PC monitor connector. Kenny Support Team J-Tech Digital, Inc

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J-Tech Digital 8-Button Control Panel Wall Plate with Programmable LED Buttons, RS-232, RS-458, Relay and IR Control (JTECH-P8)

J-Tech Digital 8-Button Control Panel Wall Plate with Programmable LED Buttons, RS-232, RS-458, Relay and IR Control (JTECH-P8)

Product ID: 472236448

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Details

Operation mode
ON-OFF
Current rating
2 Amps
Operating voltage
12 Volts
Contact type
Normally Open
Connector type
hdmi mini usb
Brand
J-Tech Digital

💻USB & software programmable

🔌Multi-protocol control: RS-232, RS-485, IR, Relay

🔘8 programmable LED buttons

Description

🎛️ Master your AV domain with precision and style!

CLEAR VISUAL GUIDANCE - Backlit buttons with 60+ ready-made labels ensure flawless operation and reduce user error.
EFFORTLESS PROGRAMMING - Use included USB cable and intuitive PC software for quick, one-touch button configuration.
ROCK SOLID SUPPORT WARRANTY - Enjoy peace of mind with a 1-year warranty plus free lifetime technical support from Houston-based experts.
UNIVERSAL DEVICE COMPATIBILITY - Seamlessly control projectors, screens, TVs, and more via RS-232, RS-485, IR, and relay outputs.
TOTAL COMMAND AT YOUR FINGERTIPS - 8 fully programmable LED-backlit buttons let you customize control for any AV setup.

The J-Tech Digital JTECH-P8 is a sleek, silver wall plate control panel featuring 8 programmable LED buttons designed for professional AV management. It supports multi-protocol communication including RS-232, RS-485, IR, and relay outputs, enabling seamless control of a wide range of devices such as projectors, screens, and TVs. Programming is simplified via USB and dedicated PC software, with backlit buttons and over 60 label options for intuitive use. Powered by DC 12V, it comes with a 1-year warranty and lifetime technical support, making it an essential tool for modern AV environments.

Specifications

Manufacturer	J-Tech Digital INC
Part Number	JTD-P8
Product Dimensions	11.43 x 7.11 x 4.06 cm; 453.59 g
Item model number	JTD-P8
Size	Wall Plate Control Panel
Colour	Silver \| JTD-P8
Power Source	DC
Wattage	24 watts
Item Package Quantity	1
Switch Type	multi-way
Batteries included?	No
Batteries Required?	No
Item Weight	454 g

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