Add four extra COM ports to your laptop or desktop computer, quickly and easily. This USB to RS232/422/485 serial adapter lets you connect to your serial devices through an external USB port.

Supports multiple serial protocols

The versatile serial adapter converts a single USB port into four RS232/RS422/RS485 serial ports, enabling you to connect, monitor, and control a wide range of serial devices, such as sensors, barcode scanners, and LED signage. It supports four operating modes, including RS232, RS422, 4-wire and 2-wire RS485.

Ideal for harsh environments

With its rugged IP30-rated metal hub housing, the serial adapter is built to meet the extreme demands of harsh and mission-critical environments. It provides 15 kV ESD protection, which helps to reduce downtime in industrial environments where communications lines are more prone to noise emissions or sudden spikes in voltage.

The serial adapter offers flexible mounting options, with a built-in wall-mounting bracket and included DIN rail mounting kit. It also features a screw-locking host connection plus a screw-locking USB-B connector on the included USB cable, to prevent accidental disconnections.

Fast data transfers

The serial adapter is equipped with high-speed UARTs, providing fast data rates of up to 921Kbps in RS232/422/485 operating modes.

The ICUSB234854I is backed by a StarTech.com 2-year warranty and free lifetime technical support.

Connector(s)
External Ports	DB-9 (9 pin, D-Sub) Male
	USB Type-B (4 pin) USB 2.0 Female
Environmental
Humidity	5~95% RH
Operating Temperature	0°C to 55°C (32°F to 131°F)
Storage Temperature	-20°C to 85°C (-4°F to 185°F)
Hardware
Bus Type	USB 2.0
Chipset ID	FTDI - FT4232H
Interface	Serial
Port Style	External Hub
Ports	4
Indicators
LED Indicators	Port receive
	Port send
	Power
	Sets of 4 - port mode
Packaging Information
Package Height	55 mm [2.2 in]
Package Length	240 mm [9.4 in]
Package Width	165 mm [6.5 in]
Shipping (Package) Weight	598 g [21.1 oz]
Performance
Buffer Size	2 KB
Data Bits	7, 8
Max Baud Rate	921.6 Kbps
Maximum Data Transfer Rate	921.6 Kbps
Parity	Odd, Even, Mark, Space, None
Serial Protocol	RS-232/422/485
Stop Bits	1, 2
Surge Protection	15 kV ESD Surge Protection
Physical Characteristics
Color	Black
Enclosure Type	Steel
Product Height	25 mm [1 in]
Product Length	128 mm [5 in]
Product Width	116 mm [4.6 in]
Weight of Product	382 g [13.5 oz]
Software
OS Compatibility	Windows® 7, 8, 8.1, 10 Windows Server® 2008 R2, 2012, 2012 R2, 2016 Mac OS® 10.9 to 10.14 Linux 2.4.x to 4.11.x LTS Versions only
What's in the Box
Included in Package	6 ft. [2 m] USB-B with screw lock to USB-A cable
	DIN rail kit
	instruction manual
	USB serial hub

Desk/wall/DIN rail mountable
Each port on the metal 4 port serial hub can be set to RS232/RS422/RS485(2wire/4wire) at baud rates up to 921.6Kbps
Incl. 6 locking USB cable
Power using incl. locking power adapter (12V) or USB (5V) DB9 male serial ports (pin9) can be individually set to 5V/12V/0V
Rugged industrial sub to serial converter w/ 15kV ESD surge protection (level 4) IP30 rating and locking connectors (all ports)
Supports current/legacy Windows/Linux/macOS + embedded platform