PCI Express Boards Introduction
Overview
Moxa’s new PCI Express Multiport Serial Boards are designed for POS and ATM applications and for use by
industrial automation system manufacturers and system integrators. The boards are compatible with all
popular operating systems, and each of them supports data rates of up to 921.6 kbps and provides full
modem control signals, ensuring compatibility with a wide range of serial peripherals. In addition, all models
work with PCI Express x1, allowing the boards to be installed in any available PCI Express slot (including x1,
x2, x4, x8, x16, x32).
PCI Express Solution
The boards comply with PCI Express Spec. 1.1. The ports’ transmission parameters are configured after the
boards are installed. The PCI BIOS automatically assigns the IRQ and I/O addresses. For this reason, you
must plug the boards into the computer before installing the drivers. For more information about PCI
Express, refer to the “Technical Reference” appendix.
ADDC™ (Automatic Data Direction Control) for RS-485
RS-485 uses differential data transmission over two wires to transmit data from one station to another, and
allows multiple transmitters and receivers to be used on the same data line. RS-485 uses half-duplex
transmission, which means that transmission and reception share the same data channels. For this reason,
only one transmitter can be active at any given time.
Moxa’s serial boards have a built-in circuitry to switch transmitters on and off automatically. We call this
form of switching ADDC® (Automatic Data Direction Control). ADDC® is much easier to implement than the
traditional handshaking method that uses the RTS signal.
Operating System Support
The PCI Express boards are compatible with all major industrial platforms, including Windows, Windows CE,
DOS, Linux, and SCO. Moxa device drivers are provided for smoother installation, configuration, and
performance.
Visit Moxa’s website at www.moxa.com
t
o download the latest drivers and user’s manuals for all of Moxa’s
products.
Moxa Serial Comm Tool
For application development, Moxa provides an easy-to-use serial communication library called PComm that
runs under the Windows operation system. Use this library to develop your own applications with Visual
Basic, Visual C++, Borland Delphi, to name a few. Utilities such as Data Scope, Monitor, Terminal Emulator,
and Diagnostics are included to make it easier to debug, monitor communication status, provide terminal
emulation, and transfer files.
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