What kind of computer uses serial port?

Used to be all your PCs came with a couple serial ports, now very rare. You will most likely need a usb to serial adapter to use this.

Is this compatible with older model of celestron nexstar 90gt(which has an older 4-pin port)

Should work with any requiring a serial connection. If computer has no serial port (most dont now a days, too slow). You will need a USB to Serial port adapter, Windows will install needed drivers.

I have nexstar 127 Slt , where can I put plug ?

The Phone jack end plugs into your hand controller, the serial end goes to your computer serial port or a usb - serial converter- see Celestron's Nexstar pages for details. Also : http://www.nexstarsite.com/ for all the Nexstar info you could want.

My computer to telescope distance is 30 ft and i also need rs232 to usb converter. which cable should be the 30ft one?

I haven't had a chance to test it, but it might be possible to use a USB over cat5/6 adaptor I have a set up for my Metro barcode scanner. I used it with several other devices and the response time was excellent.

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🌌 Elevate Your Stargazing Game!

USER FRIENDLY DESIGN - Simple plug-and-play setup for both novice and experienced astronomers.
LIGHTWEIGHT DURABLE - Crafted from high-quality materials for long-lasting performance.
SEAMLESS CONNECTIVITY - Easily connect your telescope to your laptop or PC for a stellar experience.
ESSENTIAL FOR UPGRADES - Necessary for flash upgrades to your telescope's hand control software.
VERSATILE SOFTWARE INTEGRATION - Compatible with various planetarium software programs for enhanced stargazing.

The Celestron RS 232 NexStar Cable is an essential accessory for connecting your computerized telescope to a laptop or PC, enabling control through various planetarium software. Designed for durability and ease of use, this lightweight cable is crucial for software upgrades and enhances your astronomical experience.

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