PRODUCTS > PCI Express I/O Cards > PCIe-800i-SI


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PCIe-800i-SI - 8-Port PCI Express to Serial PCI Express I/O Card (RS-422/485) with Optical Isolation


  • Adds eight high speed RS-422/485 ports by connecting to a PCI Express bus
  • Data rates up to 921.6kbps
  • 3000V DC optical isolation for all signals
  • 256 bytes transmit/receive FIFO buffer
  • Automatic RTS/CTS and DTR/DSR hardware flow control
  • Automatic Xon/Xoff software flow control
  • PCI Express 2.0 Gen 1 compliant
  • PCI Express 1 Lane compliant
  • 16C550 compability
  • Drivers provided for Windows and Linux OS


Bus PCI Express; Single-Lane (×1)
Chipset EXAR XR17V358
Plug & Play Supported
IRQ & IO Address Assigned by system BIOS
Serial Interface
Interface RS-422/485
Number of Ports 8
Connector DB44 female
Max. Speed 921.6kbps for transmit & receive
RS-422 Signals TxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals TxD-, TxD+, RxD+, RxD- (4 wire), Data-, Data+ (2 wire)
UART FIFO Buffer Size 256 bytes for transmit & receive on each port
Protection 15kV ESD protection and 600W surge protection for all signals
3000V DC optical isolation for all signals
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Parity None, odd, even, mark, space
Stop Bit 1, 1.5, 2
Flow Control Hardware (RTS, CTS)
Operating Temperature 0°C to 60°C (32°F to 140°F)
Storage Temperature -40°C to 85°C (-40°F to 185°F)
Operating Humidity 0% to 80% RH
Safety Approvals CE, FCC