Serial Communication Board with 2 RS-232 ports.

The VXC/VEX-112 series communication card provides 2 RS-232 serial ports. Each port supports for speed up to 115200 bps and can work for full-duplex communication.

Users may specify a COM port number manually by setting COM-Selector (DIP switch), or let the driver choose an available number automatically. The driver provides a maximum of 128 KB software buffer for each COM port under Windows. It’s practical for large file transmission.

The data lines of each serial ports on i version VXC/VEX cards come with photocouplers design. The on-board photo couplers use a short optical transmission path to transfer a signal between elements of a circuit, and keep the data lines electrically isolated. It can help cutting down on ground loops, common mode voltages and block voltage spikes, provide electrical isolation, and offer significant protection from serious over-voltage conditions in one circuit affecting the other.

In harsh industrial environments, the on-board ESD protection component (for i version) diverts the potentially damaging charge away from sensitive circuit to protects the computer and equipment from the sudden and momentary electric current.

The serial communication card are designed for use with intelligent devices like bar code reader, serial printers, intelligent sensors, instrumentation equipment, computers and almost any device with an RS-232 port.

Request For Quotation



  • Industrial Machinery
  • Building Automation
  • Restaurant Appliances
  • Laboratory Equipment & Research
  • Industrial Communication


  • Supports PCI Express, Plug and Play for VEX-112(i)
  • Supports 3.3 V/5 V PCI bus, Plug and Play for VXC-112(i)AU
  • Provides 2 RS-232 ports
  • Built-in COM-Selector
  • 128 KB Software Buffer (max.) for Each COM Port Under Windows
  • +/-4 kV ESD Protection for i versions
  • 2500 VDC Isolation for i versions
  • 128-byte Hardware FIFO for Each Port
  • Short Card Design


  • Windows NT4/2000 drivers for VXC series.
  • Drivers for 32-bit Windows XP/2003/2008/7/8/10
  • Drivers for 64-bit Windows XP/2003/2008/7/8/10
  • Driver for Linux

Hardware Specifications

Models VXC-112AU VXC-112iAU VEX-112 VEX-112i
Communication Port
UART 16C950 compatible
Baud Rate 50 ~ 115200 bps
Data bit 5, 6, 7, 8
Stop bit 1, 1.5, 2
Parity None, Even, Odd, Mark, Space
FIFO Internal 128 bytes
Isolated 2500 VDC 2500 VDC
Bus Type Universal PCI, 3.3 V and 5 V, 33 MHz, 32-bit, Plug and Play mechanism PCI Express x1, Plug and Play
COM-Selector Yes (8-bit DIP switch)
Connector 2 x DB9 (Male)
Power Consumption 100 mA @ 5 V 480 mA @ 5 V 120 mA @ 5 V 440 mA @ 5 V
Operating Temperature 0 °C ~ +60 °C
Storage Temperature -20 °C ~ +70 °C
Humidity 0 ~ 90% RH, non-condensing
Dimensions (L x W x D) 134 mm x 90 mm x 22 mm 110 mm x 94 mm x 22 mm

Ordering Informations

PCI Express Bus
VEX-112 CR PCI Express, Serial Communication Board with 2 RS-232 ports (RoHS)
VEX-112i CR PCI Express, Serial Communication Board with 2 Isolated RS-232 ports (RoHS)
Universal PCI Bus
VXC-112AU CR Universal PCI Bus, Serial Communication Board with 2 RS-232 ports (RoHS)
VXC-112iAU CR Universal PCI Bus, Serial Communication Board with 2 Isolated RS-232 ports (RoHS)