• uc 257 upci 2xrs232
  • UC 257 RS 232 Pinout
uc 257 upci 2xrs232
  • Two RS232 serial ports
  • Option to add a printer port via fly lead
  • Data transfer rates up to 115,200 baud
  • Universal PCI - tried and trusted
  • Drivers for all popular operating systems including Windows 10,8,7, XP and 2000
  • Lifetime Warranty and Support
  • UC-257-datasheet (0.81 MB)
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Universal PCI providing two RS232 serial ports, with an option of a printer port connected via flylead. Data transfer rates up to 115,200 baud and the 128 byte deep transmit and 128 byte receive FIFOS, coupled with 1Mbit/s line drivers deliver uncompromising performance on your PC.Includes drivers for all Windows 32 bit and 64 bit Operating Systems, including Windows 10. Alternate option available with two RS232 serial ports and additional LPT printer port on fly lead (part number UC-257F).

Customer Feedback

Operating Systems

Tech Spec

Serial Port
ConnectorDB9 Connector - 9 Pin Male
UARTBrainboxes 16C958
UART Compatibility16750/16550/16450 backwards compatible as well as an enhanced 950 mode
Tx FIFO Size128
Rx FIFO Size128
Operating DistanceEIA - RS232 Standard
CableOptional 1 port LPT on fly lead (CC-032)
Serial Port Settings
Max Baud Rate115,200
Data Bits5,6,7 or 8
ParityOdd, Even, None, Mark or Space
Stop Bits1, 1.5 or 2
Tx/Rx ModesPoint to Point
PCB Layers4
Form FactorStandard Height
Includes Printer PortYes
Galvanic IsolationNo
Power Consumption190mA @ 5V, 12mA @ 12V
Product Weight0.083 kg, 2.93 ounces
Product Dimensions136x18x120 mm, 5.4x0.7x4.7 inches
Packaged Weight0.194 kg, 6.84 ounces
Packaged Dimensions160x135x45 mm, 6.3x5.3x1.8 inches
GTIN (barcode)837324000351
Operating System Compatibility
Operating Systems
  • Microsoft Windows 10
  • Microsoft Windows 8 32 bit & 64 bit Editions
  • Windows Server 2012
  • Microsoft Windows 7 32 bit & 64 bit Editions
  • Windows Server 2008 32 bit & 64 bit Editions
  • Windows Vista 32 bit & 64 bit Editions
  • Windows XP 32 bit & 64 bit Editions
  • Microsoft Windows 2000
  • DOS
PCI 3.0Peripheral Component Interface


Microsoft Signed Drivers

Microsoft Hardware