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PCI-1484E is a general-purpose communication card, intended for PCI Express bus. The card provides four isolated RS-422/485 ports.

PCI-1484E card is based on MCS9901CV controller (manufacturer MosChip Semiconductor) or 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-1484E 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-1024E, fitted with the interface circuits located in the next slot.

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.

Like any other TEDIA products, the RS-422/485 output circuits provide surge protection (TVS diodes) and termination impedances with fail-safe bias resistors, as advised by many standards (e.g. Profibus).

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-1484E card, PCI-1024E expansion card and InfoCD with drivers and user manual.


Type PCI-1484E
Number of ports 4
Ports type RS-422/485
Communication controller MCS9901CV (MosChip Semiconductor)
MCS9904CV (ASIX Electronics Corp.)
Transfer rate up to 921.6kBd
Supported signals RS-422: TXD+ (B), TXD- (A), RXD+ (B), RXD- (A)
RS-485: TXD/RXD+ (B), TXD/RXD- (A)
Transceiver type ADM4853 (Analog Devices)
RS-422/485 operating modes RS-422, RS-422 multimaster, RS-485
RS-422/485 flow control automatic (ADFC), DTR
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)
I/O and MEM address,
Interrupt channels
assigned by PnP PCI BIOS
Dimensions approx. 85x105 mm (PCI-1484E)
approx. 85x55 mm (PCI-1023E)