Do the com/tty port numbers always map to the same physical port? same question if the unit is connected to a different usb port? same com/tty no?

I can only comment on a Linux system; Yes. However if you have other serial ports connected, this may change. With the 8 port I have. Ports 1-8 are always mapped to /dev/ttyUSB0-7 respectively. If I connect another single port serial. This will map as /dev/ttyUSB8. But upon reboot with both connected. The single port gets mapped to /dev/ttyUSB0, and the 8 ports to /dev/ttyUSB1-8.

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🔗 Connect like a pro, mount anywhere, and never lose your port mojo!

QUAD PORT POWERHOUSE - Expand a single USB into 4 reliable RS232 serial connections for seamless legacy device integration.
TRUSTED IT PRO CHOICE - Backed by StarTech.com's 2-year warranty and lifetime tech support since 1985—confidence in every connection.
PLUG PLAY SIMPLICITY - No external power needed—just USB power and instant connectivity for hassle-free setup.
STAY CONNECTED ALWAYS - COM port retention keeps your device assignments intact through every reboot—no reconfiguration needed.
BUILT TO BRAVE THE ELEMENTS - Industrial-grade metal casing with wall mount & DIN rail clips ensures durability in any environment.

The StarTech.com ICUSB2324I is a rugged 4-port USB to RS232 serial adapter designed for industrial and professional use. Featuring a durable all-metal enclosure, versatile mounting options including wall and DIN rail, and COM port retention technology, it ensures stable, hassle-free serial connectivity. Powered solely via USB, it eliminates the need for external adapters. Trusted by IT pros since 1985, it comes with a 2-year warranty and free lifetime technical support.

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Package Dimensions L x W x H	21.6 x 15 x 5.3 centimetres
Package Weight	0.5 Kilograms
Product Dimensions L x W x H	17.8 x 5.8 x 2.3 centimetres
Item Weight	299 g
Brand	StarTech
Colour	Black
Country of Origin	Taiwan
Included components	1 - USB to RS-232 Serial Adapter
Model year	2012
Plug profile	Wall
Part number	ICUSB2324I
Size	4-port
Style	4-Port
Guaranteed software updates until	unknown

StarTech.com 4 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub, TAA (ICUSB2324I)

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