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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NexStar RS-232 Cable

Product ID: 2097463

Details

Brand
Celestron
Connector Type
Rs-232
Cable Type
USB
Compatible Devices
Laptop Monitor
Special Feature
Data Transfer

💻Connects to PC

📏62-inch length

🔌RS-232 jack

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$U2293

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔭 Elevate Your Stargazing Game!

EXTENDED REACH - 62-inch length provides flexibility in setup without compromising on performance.
USER FRIENDLY DESIGN - Standard serial connector ensures compatibility with a wide range of devices.
DATA DRIVEN ASTRONOMY - Download new data directly into your telescope's database for enhanced stargazing.
SEAMLESS CONNECTIVITY - Easily interface your NexStar telescope with your laptop or PC for a stellar experience.
SKY MAPS AT YOUR FINGERTIPS - Control your telescope effortlessly by clicking on sky maps displayed on your computer.

The Celestron NexStar RS-232 Cable is a 62-inch interface cable designed to connect your NexStar telescope to a laptop or PC, allowing for easy control and data updates. With an RS-232 jack on one end and a standard serial connector on the other, this cable enhances your astronomical experience by enabling seamless interaction with digital sky maps.

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