General
FIFO buffer	128 Byte
Number of ports	4
Maximum data rate	921,6 kbps
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2

The Moxa CP-114EL-DB25M is an intelligent 4-port PCI Express serial card designed for use in industrial environments such as POS systems, cash dispensers, and automation systems. The device supports serial interface standards RS-232, RS-422, and RS-485 and enables a maximum data rate of 921.6 kbps per port. The card is manufactured in low-profile format, making it suitable for space-saving PCs and servers. It is fully PCI Express 1.0 compliant and operates at a supply voltage of 3.3 VDC. Integrated LEDs for transmit and receive status support on-site maintenance and diagnostics. The card is not equipped with galvanic isolation, whereas the -I models of the series offer 2 kV galvanic isolation, which is advantageous for sensitive industrial applications.

Applications

The CP-114EL-DB25M is suitable for applications requiring reliable serial communication, particularly in environments with limited space. Typical use cases include integration of peripheral devices into industrial controls, connection of sensors, printers, or terminals in POS systems, and communication with legacy devices in automation systems. The support for multiple serial protocols (RS-232, RS-422, RS-485) enables flexible connection of various devices. The card is intended for use in systems running Windows, Linux, and UNIX operating systems, with drivers available for various OS versions.

Functions and Features in Detail

The card features a 16C550C-compatible communication controller with a 128-byte FIFO buffer, enabling efficient data transfer. Serial communication supports baud rates from 50 bps to 921.6 kbps, including non-standard rates. Data transmission configuration includes data bits (5, 6, 7, 8), stop bits (1, 1.5, 2), and parity types (none, even, odd, space, mark). Flow control options include RTS/CTS and XON/XOFF. Signal assignment is defined for RS-232 (TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND), RS-422 (Tx+, Tx-, Rx+, Rx-, GND), and RS-485 (4-wire: Tx+, Tx-, Rx+, Rx-, GND; 2-wire: Data+, Data-, GND). The card can be installed in up to eight PCIe slots per PC.

Technology Explained Simply

The PCI Express 1.0 interface enables fast and stable connection to the host system. The 3.3 VDC supply voltage is standard in modern computers. The 128-byte FIFO storage reduces processor load by buffering data packets until processed by the host. Support for RS-422 and RS-485 enables longer transmission distances and higher noise immunity compared to RS-232, which is important for industrial applications. Integrated LEDs per port indicate transmit and receive status, which is helpful for troubleshooting.

Compatibility and Accessories

The card is compatible with drivers for various operating systems, including Windows (DOS to Windows 10, Server 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-M44M25x4-50 (DB44 to 4 x DB25-M, 50 cm), CBL-M44M9x4-50 (DB44 to 4 x DB9-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). These cables enable connection to devices with DB9 or DB25 connectors.

Installation and Mounting

Installation is performed by inserting the card into an available PCI Express slot in the host computer. The card is in low-profile format, allowing installation in compact enclosures. Power is supplied via the PCIe slot. Configuration is done through the provided drivers and system control. The quick installation guide included in the package supports setup.

Operational Advantages

The card offers high reliability with an MTBF of 2,347,197 hours (for the non-isolated model). Support for multiple serial standards and high data rates enables flexible and powerful integration into existing systems. Integrated LEDs simplify maintenance. The card is designed for operation in environments with a temperature range of 0 to 55 °C and humidity of 5 to 95 % (non-condensing). 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 electromagnetic compatibility. Environmental certifications RoHS, CRoHS, and WEEE comply with applicable environmental regulations. The manufacturer’s warranty is 5 years.

The delivery includes the CP-114EL-DB25M serial card, a cable M44 to 4 x DB25-M, a quick installation guide, and a warranty card.