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

Unit Count	1.0 Count
Number of Items	1
Item Weight	0.01 Ounces
Package Quantity	1
Item Dimensions	8.9 x 5 x 2.1 inches
Finish Types	Matte
Color	Black
Warranty Type	365 days from purchase date
Input Voltage	5 Volts
Current Rating	150 Milliamps
Power Plug	No Plug
Connector Type Used on Cable	USB to Serial RS-422 RS-485
Number of Ports	2
Compatible Devices	Desktop computer, Laptop, Raspberry Pi, POS, controller, building automation system, card reader, industrial control unit Modbus
Specific Uses For Product	data capture, computer to modem, communication

DTECH 4 Feet USB to RS422 RS485 Serial Port Converter Adapter Cable with FTDI Chip Supports Windows 10, 8, 7, XP and Mac

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