The **USB-2COM-PRO** is a high-grade USB to dual RS-232 serial adapter. It is designed to provide instant connectivity for two RS-232 serial devices (such as modems, sensors, or industrial PLC equipment) through a single USB port. Below is an overview of its core electronic components and technical specifications. --- ### 1. Key Electronic Components | Component | Description | | :--- | :--- | | **Bridge Controller** | Typically uses a high-performance **FTDI Chip** (e.g., FT2232H) which manages the USB-to-UART conversion. | | **RS-232 Transceiver** | Integrated charge pump circuits that convert low-voltage logic signals to the ±5V to ±15V levels required by the RS-232 standard. | | **Internal Buffer** | Features a 128-byte transmit buffer and a 384-byte receive buffer per port to ensure high-speed data integrity. | | **ESD Protection** | Built-in 15KV Electrostatic Discharge (ESD) protection for all serial signals to prevent damage from power surges. | | **Status LEDs** | Individual LEDs for **TX** (Transmit) and **RX** (Receive) for each port to provide visual diagnostics. | ### 2. Technical Specifications The device is engineered for industrial environments where stability is critical. * **USB Interface:** USB 2.0 Full Speed (backward compatible with USB 1.1). * **Serial Interface:** Two DB9 Male connectors. * **Baud Rate:** Supports data transfer rates from **300 bps to 921.6 Kbps**. * **Data Bits:** 7 or 8 bits. * **Stop Bits:** 1 or 2. * **Parity:** Odd, Even, None, Mark, or Space. * **Flow Control:** RTS/CTS, XON/XOFF. ### 3. Pinout Configuration (DB-9 Male) The USB-2COM-PRO follows the standard RS-232 pinout for its dual DB9 ports: | Pin Number | Signal Name | Description | | :--- | :--- | :--- | | 1 | **DCD** | Data Carrier Detect | | 2 | **RXD** | Receive Data | | 3 | **TXD** | Transmit Data | | 4 | **DTR** | Data Terminal Ready | | 5 | **GND** | Signal Ground | | 6 | **DSR** | Data Set Ready | | 7 | **RTS** | Request to Send | | 8 | **CTS** | Clear to Send | | 9 | **RI** | Ring Indicator | --- ### 4. Power and Environmental * **Power Source:** Bus-powered (takes power directly from the USB port, no external adapter required). * **Operating Temperature:** 0°C to 55°C (32°F to 131°F). * **Storage Temperature:** -20°C to 85°C (-4°F to 185°F).