General
Number of ports	4
Serial standards	RS-232
Maximum baud rate	921,6 kbps
FIFO buffer	128 Byte
MTBF	3.601.447 Stunden

The Moxa CP-104EL-A-DB9M is an industrial-grade 4-Port RS-232 serial card based on the PCI Express bus, specifically developed for use in industrial environments such as POS systems, cash dispensers, or automation systems. The card provides stable and powerful serial communication with a maximum baud rate of 921.6 kbps per port, enabling fast data transfer even under high loads. The 128-byte FIFO buffering ensures efficient data processing and reduces processor load. The card is equipped with hardware- and software-based flow control to prevent data loss and stabilize communication. The RS-232 interface supports various transmission parameters such as data bits (5, 6, 7, 8), stop bits (1, 1.5, 2), and parity types (none, even, odd, space, mark), allowing flexible adaptation to different devices.

Applications include especially scenarios where multiple serial devices need to be connected to a PC, for example in manufacturing automation, retail, or logistics. The card is designed for use in compact systems, as it supports the Low-Profile format, making it installable in mini-PCs and standard desktop computers. The PCI Express 1.0 (x1) interface ensures a compatible and reliable connection to the system bus. The maximum of eight cards per PC enables scalable expansion of serial interface capacity.

Functions and features in detail include a DB44 connector on the card, through which the four serial ports are provided via an included breakout cable. The CP-104EL-A-DB9M model is equipped with a cable that splits the DB44 connector into four DB9-M connectors (50 cm length). This allows direct connection to standard DB9 devices. For maintenance and diagnostics, integrated LED indicators for transmit (Tx) and receive activity (Rx) are available at each port, enabling visual monitoring of operation. The card supports a wide range of operating systems, including Windows (from DOS to Windows 10, Server 2019, CE 5.0/6.0, XP Embedded), Linux (kernel 2.4.x to 5.x), and UNIX systems such as QNX 6, Solaris 10, UnixWare 7, and SCO OpenServer 5/6, enabling universal use in various system environments.

Technology explained simply shows that the card is based on a 16C550C-compatible communication controller, known for its reliability and performance in serial applications. Power supply is provided via the PCI Express bus with 805 mA at 3.3 VDC, enabling the card to operate independently without requiring additional power cables. The operating temperature ranges from 0 to 55 °C, and the storage temperature from -20 to 85 °C, making the card suitable for use in environments with moderate temperature fluctuations. Humidity is 5 to 95 % (non-condensing), allowing use in normal indoor spaces and protected outdoor areas.

Compatibility and accessories include the use of separate connection cables, available optionally. These include the CBL-M44M9x4-50 (DB44 to 4 x DB9-M, 50 cm) and CBL-M44M25x4-50 (DB44 to 4 x DB25-M, 50 cm), as well as adapter cables such as CBL-F9M9-20 (DB9-F to DB9-M, 20 cm) and CBL-F9M9-150 (DB9-F to DB9-M, 1.5 m), enabling flexible connections to various serial devices. The card is designed for use in systems with PCI Express 1.0 (x1) interface and supports up to eight cards per PC.

Mounting and installation are performed via the standard PCI Express slot. The card is designed in Low-Profile format, allowing installation in compact enclosures. Driver support for the mentioned operating systems is standard, enabling configuration after installation.

Operational advantages include high reliability, documented by an MTBF of 3,601,447 hours according to Telcordia (Bellcore) TR/SR standard. The card complies with EMC standards such as EN 55032/35, CISPR 32, FCC Part 15B Class B, and EMS tests according to IEC 61000-4-2/3/4/5/6/8, ensuring stable operation in electromagnetically noisy environments. Environmental certifications RoHS, CRoHS, WEEE ensure environmentally compatible manufacturing and disposal. The 5-year manufacturer's warranty provides additional security for operation.

The card includes an attachment cable (M44 to 4 x DB9-M, 50 cm), a quick installation guide, and a warranty card in the delivery scope. The combination of robust design, broad compatibility, and long service life makes the CP-104EL-A-DB9M a suitable solution for industrial and embedded applications requiring stable serial communication.