Can a hdmi output device be entered in a tv 9 pin input?

The USB to serial adapter here is for RS485/RS422 protocol data communication application, if there is a RS232C protocol interface in your TV (RS-232 does not transmit audio and video signals, but is used specifically for control of devices in an AV system), and you are trying to use computer to control the TV, you may check this link (USB to serial RS232 cable with FTDI chip): http://www.amazon.com/dp/B00H8HDS2K

Can this device actually achieve 921600 baud? I've had devices that claimed they would but cant.

This DTECH USB to RS485/422 Cable supports 921600 baud. (at 921600 bps, no more than 300 meters; 600 meters at 38400 bps; 1200 meters at 6900 bps)

I have several scales with usb outputs, and i would like to connect them to plc with rs485 input. can i use this converter?

Yes, the USB RS485 adapter should work for you. If there is any issues, please feel free to contact us via the order.

Can this adapter also support RS232?

No, this USB to serial adapter is for RS485 / RS422 protocol data communication. For USB to RS232 cable, please check this link for RS-232 protocol (FTDI chip, also has LED lights): https://www.amazon.com/dp/B0195ZD3P4?ref_=dpLink

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Description

⚡ Power up your legacy devices with modern ease!

FLEXIBLE READY - 4-foot cable length gives you freedom to connect devices anywhere on your desk.
ROCK SOLID RELIABILITY - FTDI chipset delivers stable, conflict-free serial communication.
UNIVERSAL COMPATIBILITY - Effortlessly works with Windows 10/8/7/XP and Mac OS for versatile use.
PLUG AND PLAY SIMPLICITY - Get connected instantly—no drivers or power supply needed.
INDUSTRIAL GRADE PROTECTION - 15KV ESD shielding guards your sensitive equipment from costly damage.

The DTECH 4 Feet USB to RS422/RS485 Serial Port Converter features a high-performance FTDI chipset for reliable data transfer, 15KV ESD protection to safeguard sensitive industrial equipment, and broad OS compatibility including Windows and Mac. Its plug-and-play design and 4-foot cable length make it the go-to adapter for professionals needing seamless serial communication without hardware conflicts.

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