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PCI-1232E is a general-purpose communication card, intended for PCI Express bus. The card provides two isolated RS-232 ports.

PCI-1232E 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.

Both ports at the PCI-1232E card lead to the D-Sub 9 connectors located on the card mounting bracket. The ports provide full modem control signals and standard pin layout.

Ports provide the optical isolation. Optional surge arresters (ESD-X2) 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 only, all documentation and software are available in the Download section.


Type PCI-1232E
Number of ports 2
Ports type RS-232
Communication controller MCS9904CV (ASIX Electronics Corp.)
see note below this table
Transfer rate up to 230.4kBd
Supported signals TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI
Transceiver type MAX3243E (Texas Instruments)
RS-232 flow control XON/XOFF, DTR/DSR, RTS/CTS
RS-232 ESD surge protection 15kV IEC 61000-4-2, air-gap
Isolation voltage 1kVDC (600VDC when ESD-X2 used)
Isolation protection Surge arrester CG5-600L
(ESD-X2 option)
Bus type PCI Express (x1, Gen 1)
Dimensions approx. 85x105 mm
Weight approx. 80 g
Weight and dimensions
of product packaging
approx. 130 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.