General
Number of ports	4
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2

The Moxa CB-114 is a 4-port serial module for industrial embedded systems, based on the PC/104-Plus (PCI) bus. It is designed for serial multiport communication and enables connection to devices communicating via RS-232, RS-422, or RS-485 interfaces. The module is designed for use in compact, modular systems where space and reliability are prioritized. The interfaces are configurable via DIP switches, allowing the operating mode (RS-232, RS-422, RS-485 in 2- or 4-wire technology) to be adapted to the requirements of connected devices.

Applications

The CB-114 is used in industrial environments where robust and flexible serial communication is required. Typical applications include connecting sensors, control devices, machine controls, or legacy devices communicating via serial interfaces. Support for wide temperature range from -40 to 85 °C makes the module suitable for demanding environments, such as those found in manufacturing, heavy industry, or outdoor applications.

Functions and Features in Detail

Each of the four serial ports features a 128-byte FIFO buffer, which enhances data transfer efficiency and prevents buffer overflows at high data rates. The maximum baud rate is 921.6 kbps, ensuring stable communication even with high data volumes. Flow control can be implemented via hardware (RTS/CTS) or software (XON/XOFF), enabling adaptation to different devices and requirements. Configuration of IRQ and I/O addresses is fully managed through the BIOS, eliminating the need for additional jumpers or manual settings.

Technology Explained Simply

The module uses the PC/104-Plus standard, which defines a compact, stackable module architecture for embedded systems. Connection is made via a 40-pin box header, which is inserted into the main system. DIP switches allow simple, hardware-based selection of interface type per port. Integrated status LEDs for transmit (Tx) and receive (Rx) on each port support diagnostics and fault detection during operation. BIOS-based address assignment ensures flexible integration into existing systems without manual configuration.

Compatibility and Accessories

The CB-114 is compatible with operating systems such as Windows, Windows CE 5.0/6.0, and XP Embedded. The maximum number of installable modules per system is eight. Optional DB9 and DB25 cable sets are available, enabling physical connection to standard serial ports.

Installation and Mounting

Installation is performed by inserting the module into the PC/104-Plus bus of a compatible embedded system. Interface configuration is done via DIP switches on the module. BIOS control of IRQ and I/O addresses is automatic, requiring no manual adjustment. Physical mounting requires no additional tools or components.

Operational Advantages

The combination of high baud rate, large FIFO buffer, and integrated flow control ensures reliable data transmission even under heavy loads. BIOS-based address assignment and DIP switch configuration simplify integration into existing systems. The wide temperature variant ensures operation under extreme environmental conditions. Status LEDs enable quick diagnosis of communication issues during operation.