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RS-422 Converter ULI-223D

RS-232 to RS-422 conversion! Compact model with port power supply support.

The ULI-223D is an industrial converter that converts RS-232 signals (TD/RD) into balanced RS-422 signals, extending communication distances up to 1.2 km. It adopts a port-powered method, obtaining power from the RS-232 handshake lines (DTR/RTS), eliminating the need for an external power supply. It supports bidirectional communication and a maximum data rate of 115.2 kbps. With its compact inline design, it is ideal for space-saving installation in control panels and on-site. It is compatible with Windows and serial communication devices, making it useful for field service and testing equipment.

Product page

basic information

- Conversion: RS-232 ⇔ RS-422 (bidirectional) - Communication distance: Up to 1.2 km - Data rate: Up to 115.2 kbps - Power supply method: Powered by RS-232 port (handshake line) - RS-232 connector: DB9 female - RS-422 connector: DB9 female - Bias resistance: 4.7 kΩ - Operating temperature: 0 to 70°C - Size/Weight: 61 × 33.3 × 17.4 mm, approximately 45 g - Certification: CE, FCC, RoHS

Price information

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Delivery Time

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Model number/Brand name

ULI-223D

Applications/Examples of results

- Connection of industrial PCs and RS-422 devices - Long-distance serial communication (up to 1.2 km) - Space-saving installation within control panels - RS-232 to RS-422 conversion for testing equipment and lab devices

Line up(1)

Model number overview
ULI-223D(BB-422PP9R) RS-232 DB9F ⇔ RS-422 DB9F, supports port power supply.

[Case Studies Included] Serial/USB Communication Devices Product Guide

PRODUCT

【Data Sheet】ULI-223-Series

DOCUMENT

Recommended Products for Industrial Sites: Advantech Industrial IoT Systems & Devices Star Product Guide (2025)

CATALOG

Recommended products

Distributors

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.