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PCI-1234U is a general-purpose communication card, intended for PCI (3.3V or 5V) or PCI-X bus. The card provides four isolated RS-232 ports.

The PCI-1234U card is based on the Oxford Semiconductor controller OXmPCI954 that provides PCI bus interface, four efficient UARTs (16C950 standard) and parallel interface in one circuit.

The first two ports at the PCI-1234U 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-1023, fitted with the interface circuits located in the next slot. The 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 card and expansion card, all documentation and software are available in the Download section.


Type PCI-1234U
Number of ports 4
Ports type RS-232
Communication controller OXmPCI954 (Oxford Semiconductor)
Transfer rate up to 230.4kBd
Supported signals TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI
Transceiver type HIN211E (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-X4 used)
Isolation protection Surge arrester CG5-600L
(ESD-X4 option)
Bus type PCI, 3V3/5V, 32-bit, 33MHz
(64-bit PCI and PCI-X compatible)
I/O and MEM address,
Interrupt channels
assigned by PnP PCI BIOS
Dimensions approx. 90x125 mm (PCI-1234U)
approx. 80x65 mm (PCI-1023)
(expansion card included)
approx. 160 g
Weight and dimensions
of product packaging
approx. 220 g
cardboard box approx. 180x130x40 mm