General
Number of ports	8
Signal standard	RS-422/485
Data rate	921,6 kbps
FIFO buffer	128 Bytes
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
MTBF	1.147.210 Stunden

The Moxa CP-138U-I-T is an 8-port serial card for use in industrial environments, point-of-sale systems (POS), and automated teller machines (ATM). As a universal PCI card, it is compatible with 3.3 V and 5 V PCI as well as PCI-X systems, enabling flexible integration into servers or industrial PCs. The card is specifically designed for RS-422/485 communication, making it suitable for robust industrial networks requiring high noise immunity and long transmission distances. The maximum data rate is 921.6 kbps, with a 128-byte FIFO buffer and integrated hardware and software flow control (XON/XOFF) ensuring stable and fast data transmission. The card supports various data formats, including data bits from 5 to 8, stop bits 1, 1.5 or 2, and parity types such as None, Even, Odd, Space, and Mark.

Industrial Application Areas
The CP-138U-I-T is designed for use in industrial automation, point-of-sale systems, and automated configurations such as ATM systems. The card enables simultaneous control of up to eight serial devices, with a maximum of eight cards installable per PC. Its use in system integrations where multiple serial end devices communicate via a central control unit is typical. The card is designed for environments requiring high reliability and long-term operation.

Functions and Equipment in Detail
The card features an MU860 controller compatible with the 16C550C standard and supports the 32-bit universal PCI bus. The connector is implemented as a DB78 socket, indicating the industrial model variant. Each of the eight ports is equipped with integrated LEDs for transmit (Tx) and receive (Rx), enabling visual diagnostics and maintenance directly on the hardware. Management software is included in the delivery scope and supports configuration and monitoring of the ports.

Technology Explained Simply
The RS-422/485 interface enables differential signal transmission, which is robust against interference and operates stably over long distances. RS-422 technology supports full-duplex communication, while RS-485 operates in half-duplex mode and is suitable for multi-point networks. The integrated flow control function ensures that data transmission is not overloaded by pausing the sender when the receiver cannot process further data. The 128-byte FIFO buffer provides data buffering to minimize transmission delays.

Compatibility and Accessories
The card is compatible with a wide range of operating systems, including Windows (95 to 10, including Embedded and Server editions such as WEPOS), Linux (kernel 2.4.x to 5.x), and various UNIX systems such as QNX 6, SCO OpenServer, UnixWare 7, Solaris 10, and FreeBSD. Driver support is comprehensive and ensures future-proof usage. The card is designed for systems requiring a high number of serial ports and can be combined with other models from the CP-118U/138U series to expand the number of ports.

Mounting and Installation
Installation is performed via the PCI bus in a compatible system. The card is inserted into the PCI slot and requires no additional power supply, as it is powered through the bus. Configuration is done using the management software included in the delivery scope. The DB78 socket enables a secure mechanical connection with industrial connectors.

Operational Advantages
The card is characterized by high reliability, with an MTBF of 1,147,210 hours according to Telcordia SR332. The wide-temperature variant allows operation from -40 to +85 °C, making it suitable for extreme environmental conditions. The integrated LEDs and management software facilitate diagnostics and maintenance. The card is equipped with various certifications, including EMC (EN 55032/35), EMI (CISPR 32, FCC Part 15B Class B), EMS (IEC 61000-4-2, IEC 61000-4-3), as well as environmental protection standards such as RoHS, CRoHS, and WEEE. The international KC approval is also present. The warranty period is 5 years.

Protection Rating and Operating Conditions
The card is designed for use in industrial environments and meets requirements for EMC and EMI compatibility. Operating conditions include a standard temperature range of 0 to 55 °C, while the wide-temperature variant (such as the CP-138U-I-T) is designed for operation from -40 to +85 °C. The card is designed for systems that are operated continuously and under high demands.

Reliability and Warranty
The high MTBF of 1,147,210 hours underscores the reliability of the card. The 5-year warranty demonstrates the manufacturer’s confidence in product quality. The card is suitable for critical applications where downtime must be avoided.

Certifications
The card meets requirements for EMC (EN 55032/35), EMI (CISPR 32, FCC Part 15B Class B), EMS (IEC 61000-4-2, IEC 61000-4-3), as well as environmental protection standards such as RoHS, CRoHS, and WEEE. The international KC approval is also present, enabling use in various markets.