General
Serial standards	RS-232
Number of serial ports	4
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2

The Moxa POS-104UL is a 4-port serial PCI expansion card designed for use in POS systems, ATM devices, and industrial automation environments. The device is based on a Universal-PCI form factor and is designed for use in compact computer enclosures, as it supports the Low-Profile design. The card is compatible with 32-bit PCI and PCI-X slots operating at 3.3 V or 5 V supply voltage, enabling integration into existing systems without additional modifications. Communication occurs via RS-232 interfaces, with the card providing four serial ports, each connected through a DB44 socket (female). The serial signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND, and RI (optional), where the RI signals can be used as an input signal for power supply.

Applications

The POS-104UL is specifically developed for applications in the Point-of-Sale (POS), ATM, and industrial automation system sectors. In these environments, reliable, high-performance serial communication is required to control peripheral devices such as cash registers, printers, scanners, or sensors. The card is particularly suitable for systems operating in harsh environments, as an optional version is available with an extended temperature range of -40 to 85 °C. Support for multiple operating systems, including Windows, Linux, and UNIX, makes it flexible for use in heterogeneous IT environments.

Functions and Features in Detail

The card offers a maximum baud rate of 921.6 kbps, enabling fast data transfer between the host system and connected devices. The communication controllers are compatible with the 16C550C standard, ensuring a stable and widely used interface. The FIFO buffer size is 128 bytes, which enhances data transfer efficiency and reduces buffer overflow. Flow control can be implemented via various methods: without flow control, via RTS/CTS, or XON/XOFF, allowing the card to adapt to different requirements. Data transmission configuration includes data bits from 5 to 8, stop bits of 1, 1.5, or 2, and parity types such as None, Even, Odd, Space, or Mark.

Technical Explanation

Power supply for connected devices can be provided directly through the serial ports. The card offers three options: 5 V (output), 12 V (output), or RI (input signal). This feature allows external devices to operate without additional power supplies, simplifying installation and reducing the number of required cables. Power supply is provided either via the PCI bus or an external power supply. The card supports up to eight cards per PC, enabling scalability in systems with a high number of serial devices.

Compatibility and Accessories

The POS-104UL is designed for 32-bit Universal-PCI and PCI-X slots and supports operating systems such as Windows, Linux, and UNIX. Driver support for these systems is extensive, facilitating integration into existing infrastructures. The card is available in a Low-Profile version, suitable for use in compact computer enclosures. An optional version with an extended temperature range (-40 to 85 °C) is available, suitable for industrial applications in extreme environments.

Installation and Mounting

Installation is performed by inserting the card into an available PCI or PCI-X slot in the computer. Due to the Low-Profile design, it is also suitable for use in compact enclosures. The serial connections are implemented via DB44 sockets (female), enabling connection with standard cables. Power supply for connected devices is provided through the ports, with power sourced either from the PCI bus or an external power supply. Configuration of serial parameters is done via operating system drivers.

Operational Advantages

The card offers high data transfer performance up to 921.6 kbps and supports flexible power supply options directly through the interfaces. Support for multiple operating systems and the ability to install up to eight cards per PC increases flexibility and scalability. The Low-Profile form factor enables use in compact systems, and the option for an extended temperature range makes it suitable for demanding industrial environments. The serial signals include all common control and status signals, ensuring compatible integration into existing systems.