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PCI-1434E is a general-purpose communication card, intended for PCI Express bus. The card provides four isolated ports (two RS-232 and two RS-422/485).

PCI-1434E card is based on MCS9904CV controller (manufacturer ASIX Electronics Corp.) that provides PCI Express bus interface, four efficient UARTs (similar to the 16C950 standard) with DMA FIFO 2x 128B in one circuit.

The first two ports at the PCI-1434E card lead to the D-Sub 9 connectors located on the card mounting bracket, the other two ports are accessible via the expansion card PCI-1023E, fitted with the interface circuits located in the next slot. The RS-232 ports provide full modem control signals and standard pin layout.

Ports provide the optical isolation. Optional surge arresters (ESD-X4) can be added to protect isolation barrier against breakdown caused by induced overvoltage.
For more information see safety guidelines for preventing overvoltage damage.

Useful feature are LED indicators on the card mounting bracket (a pair for every port) providing a comfortable check of the line activity.

Delivery details

The product packet includes the PCI Express card and expansion card, all documentation and software are available in the Download section.


Type PCI-1434E
Number of ports 4
Ports type 2x RS-232 + 2x RS-422/485
Communication controller MCS9904CV (ASIX Electronics Corp.)
see note below this table
Transfer rate up to 230.4kBd
up to 921.6kBd
Supported signals RS-232: TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI
RS-422: TXD+ (B), TXD- (A), RXD+ (B), RXD- (A)
RS-485: TXD/RXD+ (B), TXD/RXD- (A)
Transceiver type MAX3243E (Texas Instruments, RS-232)
ADM4853 (Analog Devices, RS-422/485))
RS-232 flow control XON/XOFF, DTR/DSR, RTS/CTS
RS-422/485 operating modes RS-422, RS-422 multimaster, RS-485
RS-422/485 flow control automatic (ADFC), DTR
RS-232 ESD surge protection 15kV IEC 61000-4-2, air-gap
RS-422/485 ESD
surge protection
300A, 8/20 µs, IEC 801-5 (TVS diodes 5V8/600W)
Isolation voltage 1kVDC (600VDC when ESD-X4 used)
Isolation protection Surge arrester CG5-600L
(ESD-X4 option)
termination impedance
Bus type PCI Express (x1, Gen 1)
Dimensions approx. 85x105 mm (PCI-1434E)
approx. 85x55 mm (PCI-1023E)
(expansion card included)
approx. 150 g
Weight and dimensions
of product packaging
approx. 210 g
cardboard box approx. 180x130x40 mm
Note: The first generation of cards (discontinued in 2013) was equipped with the MCS9901CV controller (MosChip Semiconductor), the second generation is equipped with the MCS9904CV controller (ASIX Electronics Corp.); both types have almost identical properties.