VEX-142 CR: Card PCI Express 2 cổng RS-422/485

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VEX-142 CR PCI Express, Serial Communication Board with 2 RS-422/485 ports (RoHS)

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VEX-142 CR: Card PCI Express 2 cổng RS-422/485


  • Supports PCI Express x1
  • Provides 2 RS-422/485 ports
  • Built-in COM-Selector
  • 128 KB Software Buffer (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 i versions
  • Short Card Design


The VEX-142 series card provides 2 RS-422/RS-485 serial ports. Each port can be configured as either RS-485 for half-duplex or RS-422 for full-duplex communication. It supports for speed up to 115200 bps and supports full-duplex communication.
Users may specify a 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.
The data lines of each serial ports on i version 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.


COM-Selector Yes (8-bit DIP switch)
Connector 2 x DB9 (Male)


COM Ports
Ports 2 x RS-422/485 (RS-422: TxD+, TxD-, RxD+, RxD-, RTS+, RTS-, CTS+, CTS-, GND / RS-485: Data+, Data-, GND)
Baud Rate 50 - 115200 bps
Parity None, Even, Odd, Mark, Space
Data Bit 5, 6, 7, 8
Stop Bit 1, 1.5, 2
FIFO Size Internal 128 bytes


Consumption 120 mA @ 5 V


Dimensions (mm) 94 x 110 x 22 (W x L x D)


Operating Temperature 0 ~ +60°C
Storage Temperature -20 ~ +70°C
Humidity 5 ~ 85% RH, Non-condensing


Data sheet


Odering information

VEX-142     CR  PCI Express, Serial Communication Board with 2 RS-422/485 ports (RoHS)

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