will this device work on linux ubuntu?

As an FTDI-based serial adapter, this works just fine under Ubuntu and most other linux distributions as the drivers have been included in the linux kernel since version 2.6.

Will driver work in Windows 8.1 / 10? Using it for RS422 TXA- (1)TXB+ (2) / RXA- (6) RXB+ (7)?

I don't know. I used this device in a development project for a client. I used it with Cygwin on a Windows 7 system and on a RS485 bus to which I had attached multiple devices. It worked flawlessly in this respect. No clue about RS422 or later Windows releases.

I need for a 2 wire PTZ security camera, what will work that has a usb connection? This is driving me crazy. PLEASE HELP

This unit is ONLY for USB to RS-485 connection, however, it will handle a 2 wire connection. I'm not sure what drivers a PTZ camera needs, but you should be able to find them on their website.

Can I use 2 of these converters on one Windows 7 computer (using two separate USB ports) to do a loop back test?

I haven't done it myself, but it should work fine. I have one of these. Once installed, the device appears to Windows 7 as a serial port device. If you install two of them, they will appear as two separate serial ports.You just need to make sure to wire them up appropriately.

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Gearmo RS485 to USB Adapter with LED Indicators, FTDI Chipset, Terminal Board, ESD Protection, Supports Windows 11, Linux, MacOS X, RS422 to USB Compatible, 5ft Cable

Product ID: 78706845

Details

Brand
Gearmo
Color
Blue
Connector Type
Serial DB9 w/
Specific Uses For Product
Connecting to

⚡600W surge protection

💻FTDI chipset for multi-OS support

🔵5ft durable cable length

MOP$418

Duties & taxes included

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Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Bridge the old and new with confidence — connect smarter, work faster!

ROBUST RELIABLE BUILD - Durable 5ft cable with secure terminal board and hex nut connectors designed for demanding industrial environments.
UNIVERSAL COMPATIBILITY - Seamlessly connects legacy DB9 serial devices to modern USB ports across Windows, Linux, and macOS.
TRUSTED ENGINEERING LEGACY - Backed by Gearmo’s 10+ years of USA-based innovation and support, ensuring dependable performance.
REAL TIME CONNECTION FEEDBACK - Built-in Power, TX, and RX LED indicators let you instantly verify data flow and device status.
INDUSTRIAL GRADE SURGE DEFENSE - 600W surge protection and 15kV ESD isolation keep your critical connections safe and sound.

The Gearmo RS485 to USB Adapter is a professional-grade serial-to-USB converter featuring a reliable FTDI chipset, 600W surge and 15kV ESD protection, and LED indicators for real-time connection status. Compatible with Windows 7-11, Linux, and macOS, it supports RS422 and RS485 protocols with a durable 5ft cable and secure terminal board, making it ideal for industrial, commercial, and office applications requiring seamless integration of legacy serial devices.

Specifications

ASIN	B005CPLOVW
Best Sellers Rank	#53 in Serial Adapters
Brand	Gearmo
Color	Blue
Compatible Devices	Devices with DB9 female serial connectors such as printers, scanners, modems, CNC machines, PLCs, and other legacy serial equipment
Connector Type	Serial DB9 Male w/ Hex Nuts, USB Type A
Customer Reviews	4.6 4.6 out of 5 stars (102)
Input Voltage	5.7 volts_of_direct_current
Item Weight	2.4 ounces
Manufacturer	Gearmo
Mfr Part Number	US-485422
Model Number	US-485422
Number of Items	1
Number of Ports	2
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	Connecting legacy serial devices to modern USB host systems
UPC	729440692384
Unit Count	1 Count
Warranty Description	1 Year
Warranty Type	1 Year

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MOP$418

Duties & taxes included

In stock

Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Macau.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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