General
Maximum baud rate	921,6 kbps
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
MTBF	3.601.447 Stunden

The CP-104EL-A-DB25M from Moxa is an industrial-grade, compact serial card with four RS-232 ports and PCI Express interface, specifically designed for use in systems such as POS terminals, cash dispensers, and automation equipment. The card is based on the CP-104EL-A series and is PCI Express 1.0 compliant, allowing it to operate in standard and low-profile PC housings. Its low-profile design enables installation in space-saving computer housings without requiring additional brackets. The card features a DB44 socket, to which four RS-232 ports are connected via an integrated cable, with the CP-104EL-A-DB25M model standardly supplied with a cable terminating in four DB25 male connectors.

Applications
This serial card is designed for industrial applications requiring reliable serial data transmission. Typical use cases include connecting peripheral devices such as printers, scanners, sensors, or industrial controllers communicating via RS-232. The card is particularly suitable for systems operated in controlled environments, such as retail environments, banks, or production facilities, where stable and maintenance-friendly communication interfaces are necessary.

Functions and Features in Detail
The CP-104EL-A-DB25M offers a maximum baud rate of 921.6 kbps per port, supporting even non-standard transmission rates. Each port features a 128-byte FIFO buffer, enhancing data transfer efficiency and minimizing buffer overflows. Flow control is supported both hardware-based (RTS/CTS) and software-based (XON/XOFF), enabling flexible communication with various devices. Signals TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND are available at each port to ensure full RS-232 communication. Integrated LEDs for transmit (Tx) and receive activity (Rx) on each port facilitate diagnosis and maintenance by visually indicating data flow.

Technology Explained Simply
The card uses a 16C550C-compatible communication controller, known for high reliability and performance in serial applications. The PCI Express 1.0 (x1) interface enables fast data transfer between the card and the system bus. The DB44 socket serves as the central connection point, from which the four serial ports are derived via a cable. The card is designed for operation with an input current of 805 mA at 3.3 VDC, typical for PCI Express cards. The maximum of eight cards per PC allows for high port density in a system without requiring additional power supply units.

Compatibility and Accessories
The CP-104EL-A-DB25M supports a wide range of operating systems, including Windows (from DOS to Windows 10/Server 2019, x86/x64, Embedded CE 5.0/6.0, XP Embedded), Linux (kernel 2.4.x to 5.x), and various UNIX systems such as QNX 6, Solaris 10, UnixWare 7, and SCO OpenServer 5/6. This ensures flexible integration into existing IT infrastructures. As accessories, separate cables are available, including CBL-M44M9x4-50 (DB44 to 4 x DB9 male, 50 cm) and CBL-M44M25x4-50 (DB44 to 4 x DB25 male, 50 cm), as well as extension cables such as CBL-F9M9-20 (20 cm) and CBL-F9M9-150 (1.5 m), suitable for individual connection requirements.

Installation and Mounting
Installation is performed by inserting the card into a free PCI Express x1 slot of the computer. Due to the low-profile design, no additional bracket extension is required. The cable connection is made directly to the DB44 socket on the card, with the supplied cable (CBL-M44M25x4-50) already terminated in four DB25 male connectors. The quick installation guide included in the delivery supports installation and configuration.

Operational Advantages
The card is characterized by high reliability, with an MTBF of 3,601,447 hours according to Telcordia (Bellcore) TR/SR standard. The operating temperature range of 0 to 55 °C and storage temperature range of -20 to 85 °C enable use in a wide variety of environments. The humidity range of 5 to 95 % (non-condensing) is also suitable for industrial applications. Certifications according to EN 55032/35, CISPR 32, FCC Part 15B Class B, and IEC 61000-4-2/3/4/5/6/8 ensure good EMC and EMS compatibility. Environmental certifications RoHS, CRoHS, and WEEE comply with current environmental regulations. The 5-year manufacturer’s warranty provides additional security for operation.

Scope of Delivery
The scope of delivery includes the CP-104EL-A serial card, a cable (CBL-M44M25x4-50, DB44 to 4 x DB25 male, 50 cm), a quick installation guide, and a warranty card.