SystemBase Multi-8U RS232 — USB to 8-Port RS232 Serial Converter Adapter

📋 Overview The SystemBase Multi-8U RS232 is a professional-grade USB to 8-port RS232 serial converter that instantly adds eight full-signal RS232 serial ports to any Windows or Linux computer through a single USB 2.0 connection. With communication speeds up to 921.6Kbps, ±15kV surge protection on every port, and per-port TX/RX LEDs for real-time status monitoring, the Multi-8U RS232 is built for demanding industrial and commercial serial communication environments. Each port features a standard DB9 connector with full RS232 handshaking signals — TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, and GND — making it ideal for connecting legacy serial devices such as modems, barcode scanners, POS terminals, and industrial controllers. The unit is USB bus-powered and includes a latching USB connector for secure, vibration-resistant connections. ⭐ Key Features 8 RS232 Serial Ports from One USB Connection — Adds eight full-signal RS232 serial ports through a single USB 2.0 port High-Speed Communication — Supports data rates up to 921.6Kbps for fast, reliable serial data transfer Full RS232 Handshaking — All 9 signals supported per port: TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, and GND ±15kV Surge Protection — Built-in ESD protection on every port safeguards connected equipment from electrical surges TX/RX LEDs Per Port — Real-time transmit and receive activity indicators on each of the 8 ports for easy diagnostics +5V Power on Pin 9 — Optional external DC adapter allows +5V power delivery through pin 9 of each DB9 connector to power connected devices DB9 Male or Female Serial Connectors — Available with either DB9 Male or DB9 Female serial connectors Latching USB Connector — Secure locking USB connection prevents accidental disconnection in industrial environments Plug and Play — Automatically detected by Windows and Linux — no reboot required USB Bus-Powered — No external power supply required for standard operation 📊 Specifications Parameter Detail Number of Ports 8 Bus Interface USB 2.0 Serial Interface RS232 Controller FT4232H Serial Connector DB9 Male or DB9 Female - Type selected above Max Communication Speed 921.6Kbps RS232 Signals TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, GND Surge Protection ±15kV ESD LED Indicators TX and RX per port (16 LEDs total) Power Supply USB VBUS (5V / 500mA) — external DC adapter optional Pin 9 Power Output +5V DC (requires external adapter) Supported OS Windows 7 / 8 / 10 / 11, Windows Server 2008+, Linux Kernel 2.6+ Architecture Support 32-bit and 64-bit Dimensions Approx. 210 × 84 × 26 mm (8.27 x 3.31 x 1.02 inches) L × W × H Weight Approx. 320g (11.3 oz) Manufacturer SystemBase Co., Ltd. 📌 DB9 Pin Assignment (RS232) Pin Signal Direction 1 DCD (Data Carrier Detect) Input 2 RXD (Receive Data) Input 3 TXD (Transmit Data) Output 4 DTR (Data Terminal Ready) Output 5 GND (Signal Ground) — 6 DSR (Data Set Ready) Input 7 RTS (Request to Send) Output 8 CTS (Clear to Send) Input 9 RI (Ring Indicator) / +5V Power Input / Power Out 💡 Note: Pin 9 functions as RI (Ring Indicator) by default. When an external DC adapter is connected, pin 9 delivers +5V power to connected devices instead. 🔧 Setup & Configuration Connect the USB cable — Plug the latching USB cable into the Multi-8U RS232 and connect the other end to an available USB port on your computer. You should hear a click when the latch engages. Install the driver — Windows will attempt automatic driver installation. If needed, download the latest driver from the SystemBase website and install manually. Linux users should contact SystemBase technical support at tech@sysbas.com. Verify COM port assignment — Open Device Manager (Windows) and confirm that 8 new COM ports appear under "Ports (COM & LPT)." You can reassign COM port numbers here if needed. Connect your serial devices — Attach your RS232 devices to the DB9 connectors using standard straight-through or null-modem cables as required by your device. Verify communication — Use the TX/RX LEDs on each port to confirm data is being transmitted and received. Open a terminal program (such as PuTTY or Tera Term) to test communication. 💡 Tip: If your serial device requires power from the converter, connect an external 5V DC adapter to the Multi-8U RS232. This enables +5V power delivery through pin 9 of each DB9 connector. 📦 What's in the Box 1x SystemBase Multi-8U RS232 Converter - Serial connector type selected above 1x Latching USB Cable 1x Quick Start Guide External DC power adapter is not included. Required only if supplying +5V power through DB9 pin 9. 🔌 Compatible With Windows 7, 8, 8.1, 10, and 11 (32-bit and 64-bit) Windows Server 2008, 2012, 2016, 2019, 2022 Linux (Kernel 2.6 and above — contact SystemBase for driver support) Any RS232 serial device with DB9 connectivity 🎯 Applications POS (Point of Sale) terminal networks Barcode scanner and receipt printer connectivity Industrial automation and SCADA systems Legacy modem and dial-up equipment Data acquisition and laboratory instrumentation Building management and access control systems CNC machine and PLC communication Surveillance and security system integration Telecommunications equipment management ⚠️ Important Notes The Multi-8U RS232 model supports RS232 only. If you need RS422/RS485 ports, look for the Multi-8U Combo model. An external 5V DC adapter is required to supply power through pin 9 of the DB9 connectors. Without the adapter, pin 9 functions as RI (Ring Indicator). For Linux driver support, contact SystemBase technical support at tech@sysbas.com. The latching USB connector provides a secure connection — press the spring button lightly and sweep to disconnect. Maximum cable length for RS232 communication depends on baud rate. For best results at high speeds, keep cables under 15 meters (50 feet). 📄 Documentation & Resources Multi-8U RS232 User Manual, Utilities and Specifications Downloads (SystemBase Website)