ICP DAS New Product: VEX-142/VEX-142i
PCI Express, 2-Port RS-422/485 Communication Board
Introduction:
The VEX-142(i) communication card provides 2 RS-422/485 serial ports and supports PCI Express bus. Each port is equipped with a 128-byte hardware FIFO, and offers speed up to 115200 bps. The RS-422/485 serial ports of VEX-142i tolerate isolation voltage up to 2.5 kV.
Users can select a specified COM port number manually by setting DIP switch, or let the driver choose an available number automatically. The driver provides a maximum of 128 KB software FIFO for each COM port under Windows. It's practical for large file transmission.
In harsh industrial environments, the on board ESD protection component diverts the potentially damaging charge away from sensitive circuit and protects the computer and equipment from damage caused by high potential voltage.
VEX-142i offers photo isolation to protect your computer and equipment against damages in harsh environment. It can help cutting down on-ground loops, common-mode voltages and blocking voltage spikes, provide electrical isolation, and offer significant protection from serious over-voltage conditions in one circuit affecting the other.
The serial communication card is designed for use with intelligent devices like bar code reader, serial printers, intelligent sensors, instrumentation equipment, computers and almost any device with an RS-422/485 port.
ESD Protection:
The VEX-142i offers TVS diode ESD protection technology, protecting your system from being damaged by the high potential voltages.
How does TVS diode work?
Under normal operating conditions, the TVS diode presents high impedance (appears as an open circuit) to the protected component. When the voltage is beyond the limits, the TVS diode avalanches to provide a low impedance path for the transient current. As a result, the transient current is diverted away from the protected components and shunted through the TVS diode. The device returns to a high impedance state after the transient threat passed.
Hardware FIFO up to 128 bytes
FIFO stands for "First In, First Out", an abstraction in ways of organizing and manipulating data relative to time and prioritization. FIFO is used for buffering and flow control while data come from hardware to software. When using hardware FIFO (buffer), a little delay on software or operating system will not lost data at all.
VXC/VEX Cards are equipped with 16- or 128-byte hardware FIFO for each port. Large hardware FIFO is useful to prevent data lost when your system works on heavy loading, e.g. while running on a multi-task operating system, such as Windows, LinuxK etc.
Isolation(VEX-142i)
Photo coupler is a device that uses a short optical transmission path to transfer a signal between elements of a circuit, typically a transmitter and a receiver. This keeps them electrically isolated X since the signal goes from an electrical signal to an optical signal, the electrical contact along the path is broken.
It can help cutting down on ground loops, common-mode voltages and blocking voltage spikes, provide electrical isolation, and offer significant protection from serious over-voltage conditions in one circuit affecting the other.
Features:
Built-in COM-Selector
Short Card Design
Supports PCI Express bus, Plug and Play
Up to 128 KB Software FIFO (max.) for each COM Port under Windows
128-byte hardware FIFO for each port
+/-4 kV ESD Protection for i versions
2500 VDC Isolation
For more information, please visit the following web site: The VEX/VXC Family -- Mulit-port Serial Cards: