This document provides information about the products and documentation of Future Technology Devices International Ltd (FTDI). The product is not intended for use in any medical appliance, device, or system in which the failure of the product might reasonably be expected to result in personal injury. The document provides preliminary information that may be subject to change without notice. The adaptation or reproduction of any part of the document without the prior written consent of the copyright holder is prohibited.
The FTDI DB9‑USB‑RS232 module provides a drop‑in replacement for legacy DB9 RS232 connectors, converting the serial signals to USB using the FT232R bridge IC. Both male (‑M) and female (‑F) versions are offered, allowing direct substitution without PCB redesign.
The datasheet covers functional description, block diagram, electrical and mechanical details, driver installation, wiring configurations, and environmental specifications, enabling designers to integrate the module into existing equipment quickly.
| USB interface speed | 12 Mbps |
|---|---|
| Maximum serial port speed | 1 Mbps |
| Operating temperature range | -40 °C to +85 °C |
| Power source | Powered by USB port (no external adapter) |
| RS‑232 signal set | TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND |
| USB host compatibility | USB 1.1 & 2.0 host and hub ports |
| Transmit buffer size | 128 bytes |
| Receive buffer size | 256 bytes |
The module uses FTDI drivers that can be downloaded from the FTDI website and install as a Virtual COM Port.
Install the DB9‑USB‑RS232‑M module in place of the existing male DB9 connector, then install the FTDI driver; the device will appear as a virtual COM port.
The module is designed as a DTE device; use straight‑through wiring for DCE connections and null‑modem wiring for DTE connections.
The male module provides pins DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, and RI as shown in Table 2.2 of the datasheet.