General
Number of ports	2 -
FIFO memory	64 Byte pro Port
Data bits	5, 6, 7, 8 -
Stop bits	1, 1,5, 2 -
EMC certification	EN 55032/24 -
MTBF	536.288 Stunden (Telcordia SR-332)

The CA-132 module from Moxa is a 2-port RS-422/485 PC/104 card, specifically developed for embedded and industrial applications where compact, reliable serial communication is required in limited space. The module enables connection of serial devices via RS-422 and RS-485 interfaces, supporting both 4-wire and 2-wire modes. It is designed for use in systems operating at temperatures from 0 to 55 °C, and is particularly suitable for industrial environments with limited space and high requirements for communication stability.

Applications

The CA-132 module is used in industrial control systems, automation plants, and embedded computers where serial data transmission via RS-422 or RS-485 is required. It is especially suitable for installations integrated into compact housings, such as machine controls, measuring devices, or monitoring systems. Support for both 2-wire and 4-wire modes expands its application possibilities, as it is suitable for both simple data transmission and bidirectional communication.

Functions and Equipment in Detail

The module features two 16C550C-compatible UARTs, each with a 64-byte FIFO memory. This ensures lossless data transmission, even at high baud rates up to 921.6 kbps. Configuration is performed via DIP switches, which set the I/O address and interrupt. Integrated Tx/Rx LEDs are provided per port, visually indicating transmission status and enabling quick diagnosis of communication issues.

Technology Explained Simply

Serial communication via RS-422 and RS-485 uses differential signal lines, offering higher noise immunity against electromagnetic interference compared to simple single lines. RS-422 supports point-to-multipoint connections, while RS-485 is suitable for multi-point networks. The 4-wire connection enables unidirectional transmission in both directions, while the 2-wire connection allows bidirectional communication, with the data line shared. Baud rates can be set between 50 bps and 921.6 kbps, with data bits (5, 6, 7, 8), stop bits (1, 1.5, 2), and parity types (None, Even, Odd, Space, Mark) configurable flexibly. Flow control is either via XON/XOFF or disabled.

Compatibility and Accessories

The module is designed for use in the PC/104 bus system, a compact, modular bus standard for embedded systems. Driver support includes Windows (DOS to Windows 10/Server 2019, x86/x64, CE 5.0/6.0, XP Embedded), Linux (Kernel 2.4.x, 2.6.x), and UNIX systems such as FreeBSD 4.x, QNX 4, SCO UNIX, and OpenServer. Common IRQs (3, 4, 5, 6, 7, 9, 10, 11, 12, 15) allow integration into existing systems without additional hardware modifications.

Mounting and Installation

Mounting is done via a 20-pin box header connected to the PC/104 bus. Configuration of the I/O address and interrupt is performed via DIP switches on the module. Power supply is 5 VDC, with a current consumption of 155 mA. The module dimensions are 90 x 96 mm, making it suitable for compact installation solutions.

Operational Advantages

The CA-132 module offers high reliability through the use of 16C550C-compatible UARTs with FIFO memory, preventing data loss at high transmission rates. Integrated LEDs simplify troubleshooting, and comprehensive driver support for various operating systems enables quick integration into existing systems. Certifications according to EN 55032/24, CISPR 32, FCC Part 15B Class A, as well as IEC 61000-4-2/-3/-4/-5/-6/-8 ensure high EMC and EMS compliance. Environmental tests according to IEC 60068-2-1/-2/-3/-14 and vibration tests according to IEC 60068-2-6 ensure robustness under industrial conditions. The MTBF is 536,288 hours according to Telcordia SR-332, indicating high operational reliability. Compliance with environmental declarations RoHS, CRoHS, and WEEE ensures environmental compatibility of the product.

Operating Environment

The module is designed for operating temperatures from 0 to 55 °C and can withstand storage temperatures from -40 to 85 °C. Humidity is 5 to 95 %, non-condensing. These specifications make the module suitable for use in controlled industrial environments without extreme climatic conditions.

Certifications and Environmental Standards

The CA-132 module meets EMC requirements according to EN 55032/24 and CISPR 32, as well as EMI requirements according to FCC Part 15B Class A. EMS tests according to IEC 61000-4-2/-3/-4/-5/-6/-8 ensure noise immunity. Environmental tests according to IEC 60068-2-1/-2/-3/-14 and vibration tests according to IEC 60068-2-6 guarantee reliability under mechanical stress. Compliance with environmental declarations RoHS, CRoHS, and WEEE ensures environmental compatibility of the product.

Warranty

The product is delivered with a 5-year warranty. Further information is available at www.moxa.com/warranty.