General
Maximum baud rate	921,6 kbps
Max. modules per PC	8
MTBF	536.288 Std. (Telcordia)

The Moxa CA-132I is an industrial-grade communication module with two RS-422/RS-485 interfaces, specifically designed for use in embedded systems. It is based on the PC/104 bus standard and connects to the system via a 20-pin box header. The module is designed for use in environments with high electromagnetic requirements and offers optical isolation of 2 kV, making it particularly suitable for applications requiring high immunity to interference. Integrated diagnostic LEDs per port enable visual monitoring of data transmission (Tx/Rx) and facilitate troubleshooting during operation.

Applications

The module is suitable for industrial automation applications requiring reliable serial communication, such as manufacturing control, process monitoring, or building automation. Support for RS-422 and RS-485 in 2-wire and 4-wire technology enables flexible connection to various peripheral devices. The operating temperature of the CA-132I ranges from 0 to 55 °C, making it suitable for use in controlled indoor environments. For applications with extreme environmental conditions, the variant CA-132I-T is available, featuring an operating temperature range of -40 to 85 °C.

Functions and Features in Detail

The module features two independent serial interfaces, each equipped with a 64-byte FIFO (First In, First Out) to optimize data buffering and processing. The maximum baud rate is 921.6 kbps, enabling fast data transmission. Support for ADDC® (Automatic Data Direction Control) for RS-485 connections allows automatic control of data direction, simplifying the configuration of RS-485 networks. Configuration is performed via DIP switches, which control the I/O address and IRQ assignment (Interrupt Request). Supported IRQs are 3–7, 9–12, and 15, with up to eight modules integrable per PC/104 system.

Technology Explained Simply

RS-422 and RS-485 technology enables serial data transmission over long distances with high immunity to interference. RS-422 is a full-duplex technology (simultaneous sending and receiving), while RS-485 can operate in 2-wire (half-duplex) or 4-wire (full-duplex) mode. The 2 kV optical isolation protects the module and the connected system from voltage surges and potential differences caused by electrical interference or differing ground potentials. Power supply is via 5 VDC, with current consumption ranging between 155 and 190 mA.

Compatibility and Accessories

The module is compatible with a wide range of embedded operating systems, including Windows (DOS to Windows 10/Server 2019, XP Embedded, CE 5.0/6.0), Linux (Kernel 2.4.x, 2.6.x), and UNIX systems such as FreeBSD, QNX 4, SCO, and OpenServer. Optional DB9 or DB25 interface cables are available, enabling flexible connection to external devices equipped with corresponding serial interfaces.

Mounting and Installation

Mounting is performed by direct installation into a PC/104-compatible system. Interface configuration is done via DIP switches located on the module. Installation requires no additional tools, as the module is directly inserted into the bus slot.

Operational Advantages

The combination of high transmission speed, integrated diagnostic function, and optical isolation ensures reliable and low-maintenance communication. Broad operating system support enables flexible integration into existing system environments. The MTBF (Mean Time Between Failures) is 536,288 hours according to Telcordia standard, indicating high reliability. Certification according to EN 55032/24, FCC, CISPR 32, and IEC 61000 series confirms electromagnetic compatibility. The module also complies with environmental standards RoHS, CRoHS, and WEEE.