General
Number of ports	4
Maximum baud rate	921.6 kbps
FIFO buffer	128 Byte

The Moxa CP-114EL-I-DB9M is an industrial-grade PCIe serial card with four ports, supporting RS-232, RS-422, and RS-485 interfaces. It is designed for use in environments where reliable serial communication is required, such as in factory automation, POS systems, or ATMs. The card features a low-profile form factor, making it suitable for compact computers. The model designation -I indicates integrated galvanic isolation of 2 kV, providing higher immunity to interference and protection against voltage spikes, especially in electrically harsh environments. The card is equipped with a DB44 connector, enabling connection to external devices.

Applications

The CP-114EL-I-DB9M is suitable for applications requiring stable serial data transmission, particularly in industrial environments with high electromagnetic interference. Typical use cases include connecting sensors, control devices, printers, or other serial peripherals to PC-based control or monitoring systems. Support for multiple serial standards (RS-232/422/485) enables flexible integration into existing systems.

Features and Specifications in Detail

The card offers a maximum baud rate of 921.6 kbps per port and supports various data formats: data bits from 5 to 8, stop bits 1, 1.5, or 2, and parities including None, Even, Odd, Space, and Mark. Flow control can be managed via RTS/CTS or XON/XOFF, ensuring efficient data transmission without data loss. Each port includes integrated LED indicators for transmit (Tx) and receive (Rx), allowing visual monitoring of operation. Signal definitions include for RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND; for RS-422: Tx±, Rx±, and GND; for RS-485-4w: Tx±, Rx±, and GND; and for RS-485-2w: Data± and GND.

Technology Explained Simply

The card is based on a 16C550C-compatible controller and uses the PCI Express 1.0 (x1) bus. The 128-byte FIFO buffers per port ensure efficient data processing and reduce CPU load. The 2 kV galvanic isolation in the -I model protects the card and host computer from voltage spikes and electromagnetic interference caused by external devices or networks. Power supply is via 3.3 V DC, with the CP-114EL-I-DB9M consuming 1170 mA.

Compatibility and Accessories

The card is compatible with a wide range of operating systems, including Windows (DOS through Windows 10, Server 2003–2019, Embedded CE 5.0/6.0, XP Embedded), Linux (Kernel 2.4.x to 5.x), and UNIX (QNX 6, Solaris 10, UnixWare 7, SCO OpenServer 5/6). Available accessories include separate cables such as CBL-M44M9x4-50 (DB44 to 4 x DB9-M, 50 cm), CBL-M44M25x4-50 (DB44 to 4 x DB25-M, 50 cm), CBL-F9M9-20 (DB9-F to DB9-M, 20 cm), and CBL-F9M9-150 (DB9-F to DB9-M, 1.5 m), which can be used depending on connection requirements.

Installation and Mounting

Installation is performed by inserting the card into a free PCIe slot of a computer. The card is designed for use in low-profile enclosures. The included cable (M44 to 4 x DB9-M) enables direct connection to serial devices. The quick start guide supports setup and configuration.

Operational Advantages

The card offers high reliability due to galvanic isolation and robust construction. Integrated LED indicators simplify troubleshooting. Support for multiple serial standards and operating systems increases flexibility. The MTBF (Mean Time Between Failures) is 603,671 hours, indicating a long service life. The warranty period is 5 years.

Environmental Conditions

The card can operate at temperatures from 0 to 55 °C and humidity levels from 5 to 95 % (non-condensing). Storage temperature ranges from -20 to 85 °C. Certifications include EMC (EN 55032/35), EMI (CISPR 32, FCC Part 15B Class B), EMS (IEC 61000-4-2 to -4-8), as well as environmental standards such as RoHS, CRoHS, and WEEE.

Scope of Delivery

The delivery includes 1 x CP-114EL-I-DB9M card, 1 x M44 to 4 x DB9-M cable, 1 x quick start guide, and 1 x warranty card.