General
FIFO	64 Bytes
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
MTBF	897.459 Stunden

The CA-108 module from Moxa is a PC/104-based serial module with eight independent RS-232 interfaces, specifically designed for use in embedded systems and industrial applications where there is a high demand for serial communication channels. The module integrates four 16C550C-compatible UARTs, providing eight separate RS-232 channels each with a 64-byte FIFO buffer. This configuration enables robust and data-transparent serial communication, suitable for critical applications in automation technology.

Applications
The CA-108 is designed for industrial environments where multiple serial devices such as sensors, controllers, printers, or measuring instruments must be connected to a central system. It is particularly suitable for systems based on the PC/104 standard, such as mobile machinery, industrial controls, or vehicle technology, where space and reliability are critical. Support for various operating systems extends its usability in heterogeneous IT infrastructures.

Functions and Features in Detail
Each of the eight RS-232 ports features integrated Tx/Rx LEDs, which visually indicate transmission activity and thus enable quick diagnosis of communication issues. Configuration is performed via DIP switches, which set the I/O base address and interrupt vector. This allows flexible adaptation to existing system environments. The signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND, ensuring full control of the serial connection.

Technology Explained Simply
The baud rate can be set between 50 bps and 921.6 kbps, allowing adaptation to different transmission speeds. Data bits can be configured to 5, 6, 7, or 8 bits, stop bits to 1, 1.5, or 2 bits, and parity to None, Even, Odd, Space, or Mark. Flow control supports options of None, RTS/CTS, and XON/XOFF, enabling communication to be optimized according to requirements. The IRQs (Interrupt Request) are fixed at values 3, 4, 5, 6, 7, 9, 10, 11, 12, and 15, and are shared among all ports.

Compatibility and Accessories
The module is compatible with drivers for various operating systems: 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 (FreeBSD 4.x, QNX 4). This software support enables integration into diverse system environments. The connection type is a 40-pin box header, which connects to the PC/104 bus.

Mounting and Installation
The module is installed into a compatible system via the PC/104 bus. Installation involves mechanical mounting and electrical connection through the 40-pin box header. Configuration via DIP switches is performed after mounting to correctly set the I/O address and interrupt. No additional mounting aids or tools are required.

Operational Advantages
The high number of serial ports in a compact form factor reduces the need for multiple individual modules. The integrated LEDs simplify fault diagnosis. Support for various operating systems and high reliability (MTBF: 897,459 hours according to Telcordia SR-332) make the module a stable solution for industrial applications. Power supply is via 5 VDC with a current draw of 210 mA. Operating temperature ranges from 0 to 55 °C, storage temperature from -40 to 85 °C, and relative humidity is 5 to 95 %, non-condensing. The module complies with EMC standards such as EN 55032/24, CISPR 32, FCC Part 15B Class A, as well as EMS and environmental tests according to IEC 61000-4-2/-3/-4/-5/-6/-8/-11 and IEC 60068-2-1/-2/-3/-14. It is RoHS, CRoHS, and WEEE compliant. The warranty period is 5 years.

The module dimensions are 90 x 96 mm (3.54 x 3.78 in).