General
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2

The CP-118U and CP-138U series from Moxa are intelligent 8-port Universal PCI interface cards designed specifically for use in industrial automation systems, POS and ATM applications. These cards enable connection to a wide range of serial devices and systems by supporting interfaces RS-232/422/485 (for CP-118U) or RS-422/485 (for CP-138U). The cards are designed for operation in demanding environments and offer high reliability through integrated features such as hardware and software flow control, as well as LED indicators for data transmission status.

Applications
These cards are particularly suitable for industrial control systems where stable and reliable serial communication is required. They are commonly used in process automation systems, sales systems (POS), and automated teller machines (ATM), where high availability and operational safety are essential. The support for wide temperature ranges also makes them suitable for locations exposed to extreme environmental conditions.

Functions and Equipment in Detail
The cards feature eight serial ports, supporting different interfaces depending on the model. The CP-118U supports RS-232, RS-422, and RS-485, while the CP-138U supports RS-422 and RS-485. The data transfer rate can be set up to 921.6 kbps. Configuration options for the serial interfaces include various 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 for the CP-118U, and XON/XOFF for the CP-138U. Each port has integrated LED indicators for transmit (Tx) and receive (Rx), simplifying maintenance and diagnostics.

Technology Explained Simply
The cards are based on the 32-bit Universal PCI bus and are compatible with 3.3 V and 5 V PCI as well as PCI-X buses. The integrated interface controller MU860 is compatible with the 16C550C standard and features a 128-byte FIFO memory, optimizing data buffering and processing. The cards can be installed up to eight times in a PC, enabling high scalability. Operating temperature ranges from 0 to 55 °C (standard) or -40 to 85 °C (Wide Temp.) depending on the model, allowing use in harsh environments. Humidity is 5–95 % (non-condensing).

Compatibility and Accessories
The cards are compatible with a wide range of operating systems, including Windows (95 to 10, Server 2008 to 2019, CE 5.0/6.0), Linux (kernel 2.4.x to 5.x), and various UNIX systems such as QNX 6, SCO, UnixWare, Solaris 10, and FreeBSD. Optional accessories include various cables (e.g. CBL-M62M25x8-100, CBL-M78M9x8-100) and connection boxes (e.g. OPT8A, OPT8B, OPT8S, OPT8-M9, OPT8-RJ45) that extend connection options.

Installation and Mounting
Installation is done by inserting the card into a free PCI or PCI-X slot in the computer. The cards are compact, measuring 82 x 135 mm, and can be used in standard PC enclosures. Configuration is performed using the provided drivers, available for the listed operating systems. The LED indicators simplify installation and maintenance by visually displaying the data transmission status.

Operational Advantages
The cards offer high reliability and long service life, as evidenced by MTBF values of 1,073,385 hours (CP-118U) and 1,147,210 hours (CP-138U). The 5-year warranty reflects the manufacturer’s confidence in quality. Support for wide temperature ranges and isolation function (2 kV for -I models) increases robustness. Integrated LED indicators and simple configuration via standard drivers simplify operation and maintenance.

Certifications
The cards comply with EMC standards EN 55032/35, EMI standards CISPR 32 and FCC Part 15B, and EMS standards IEC 61000-4-2 (4 kV contact, 8 kV air) and -4-3 (3 V/m). KC certification is available for the CP-138U. These certifications ensure electromagnetic compatibility and safety in various markets.

Scope of Delivery
The scope of delivery includes a CP-118U/138U series card, a quick start guide, and material and warranty information. The cards are available in standard and Wide Temp. versions, with the Wide Temp. version designed for operating temperatures from -40 to 85 °C. The isolation function (2 kV) is only available on -I models.

Dimensions and Weight
The card dimensions are 82 x 135 mm.

Warranty Period
The warranty period is 5 years.

MTBF
The MTBF is 1,073,385 hours (CP-118U) and 1,147,210 hours (CP-138U).