USB Serial Converter ULI-321D
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RS-232 connection via USB port! Compact industrial converter supporting 921.6kbps.
ULI-321D is an industrial USB-to-serial converter that adds an RS-232 port to a PC's USB port. It supports USB 2.0 full speed (12Mbps) and enables high-speed data transfer of up to 921.6kbps for RS-232 communication. Powered by the USB port, it requires no external power supply and features a compact inline design, making it ideal for space-saving installation in control panels and field applications. It is compatible with serial communication devices such as Modbus RTU and can be easily set up on Windows 8/10/11 and Linux (Ubuntu). It comes with a USB cable for immediate use and is a highly reliable model suitable for field service and testing equipment.
basic information
- Interface: RS-232 (DB9 male) - Data rate: Up to 921.6kbps - USB specification: USB 2.0 full speed (12Mbps), Type B connector - Power supply method: Powered by USB port (5VDC), power consumption <0.5W - Isolation protection: None (for isolation needs, use ULI-321DC model) - Driver support: Windows 8/10/11, Linux (Ubuntu) - Operating temperature: 0–70°C, humidity 95% (non-condensing) - Enclosure/Mounting: Plastic enclosure, inline installation - Size/Weight: 58×32×16mm, approximately 104g (including cable) - Accessories: USB cable (0.9m) - Certification: CE, FCC, RoHS
Price information
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Delivery Time
Model number/Brand name
ULI-321D
Applications/Examples of results
- Connection of industrial PCs and RS-232 devices (PLC, measuring instruments) - Data collection from Modbus RTU compatible devices via USB connection - Serial communication with a notebook PC for field service - USB to RS-232 conversion for testing equipment and lab devices - Space-saving serial connection within control panels
Line up（1）
| Model number | overview |
|---|---|
| ULI-321D（BB-232USB9M） | USB Type B ⇔ RS-232 (DB9), supports 921.6kbps, standard model |
catalog（3）
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In 1983, Advantech (Advantech Co., Ltd.) was founded in Taiwan. For over 40 years, we have been developing high-quality and high-performance computers for industrial applications. As of 2024, we offer a lineup of over 3,000 various IoT devices. As the world's No. 1 manufacturer in the industrial computer market, with a presence in 95 cities across 26 countries, we aim to cultivate a prosperous future by solving social issues through AI × IoT platform services. *Source: OMDIA - No. 1 in global market share for industrial PCs, 42.5% (2023 edition)* In Japan, we established Advantech Co., Ltd. in 1997. In 2018, we formed a capital and business alliance with Omron Nogata Co., Ltd. to further expand sales and to quickly respond to market demands by offering design to production (DMS/ODM) services. By merging Taiwan's speed with the technological expertise we have cultivated over the years, we will establish a brand that meets the needs of our partners.