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

The Moxa CA-132I-T is an industrial-grade 2-port RS-422/485 PC/104 module, specifically designed for use in embedded systems with PC/104 expansion bus. It serves as a serial communication platform for applications in automation technology, field devices, data loggers, or in energy and automation environments where robust and reliable data transmission is required. The module enables high-speed transmission with a maximum baud rate of 921.6 kbps and is compactly designed to be integrated in limited space conditions.

Applications

The module is designed for industrial environments where stable serial communication under challenging conditions is required. It is particularly suitable for field devices, data loggers, automation systems, and power plants, where high operational reliability and longevity are critical. Support for multiple operating systems, including Windows CE 5.0/6.0, Windows XP Embedded, Linux, and UNIX, expands its application possibilities in various embedded systems.

Functions and Features in Detail

The CA-132I-T features two serial interfaces supporting both RS-422 and RS-485 (in 2-wire and 4-wire variants). The ADDC® function (Automatic Data Direction Control) automatically manages data direction during RS-485 communication, simplifying configuration and operation. Each port is equipped with Tx/Rx LEDs that visually indicate transmission status. The integrated software flow control (XON/XOFF) in the chip enables efficient data control without additional hardware. The DIP switches allow configuration of the I/O base address and interrupt (IRQ), facilitating adaptation to existing systems.

Technology Explained Simply

The serial interface supports a baud rate from 50 bps to 921.6 kbps, ensuring fast and reliable data transmission. The FIFO buffer size of 64 bytes ensures efficient data processing and minimizes delays. The 2 kV optical isolation protects the module from electrical interference and voltage spikes, which is especially important in environments with high EMC risk. The temperature resistance from -40 to 85 °C makes the module suitable for use in extreme environments, such as outdoor installations or industrial facilities with high thermal loads.

Compatibility and Accessories

The module is designed for the PC/104 bus and features a 20-pin box header as the connection interface. It supports IRQs 3 to 7, 9 to 12, and 15 (shared), and can integrate up to eight boards per PC. Software support includes Windows (DOS to Windows 10/Server 2019), Linux (kernel 2.4.x, 2.6.x), and UNIX systems such as FreeBSD, QNX 4, SCO UNIX, and OpenServer. Optional connection cables with DB9 or DB25 are available, enabling connection to standard serial devices.

Installation and Mounting

Installation is performed by inserting the module into a PC/104-compatible system. Configuration of the base address and IRQ is done via DIP switches on the module. The connection cables (optional) are attached to the 20-pin box header and connected to external devices. The integrated LED indicators facilitate diagnostics during operation.

Operational Advantages

The module offers high reliability due to its robust construction and extended temperature range. The optical isolation protects against interference and increases operational safety. The ADDC® function reduces complexity in RS-485 networks. Comprehensive operating system support and the compact design simplify integration into existing embedded systems. The 5-year warranty underscores the product’s longevity and quality.

Certifications

The module complies with EMC requirements according to EN 55032/24, EMI standards CISPR 32 and FCC Part 15B, as well as EMS standards IEC 61000-4-2 to -4-8, confirming its suitability for industrial applications.