The COMM+4.cPCI provides four 3U RS­232/422/485 serial ports for demanding automation and control applications. Each port can be field configured to RS-232/422/485 for maximum flexibility. Our revolutionary Automatic RS-485 Enable circuit is included onboard to simplify multidrop network connections. 16850 UARTs with deep 128 byte FIFOs are standard to reduce system overhead, even at high speeds. All Sealevel Systems boards are backed by a lifetime warranty.

We include our Advanced COM drivers for 95/98/ME/NT/2000 and XP providing IRQ sharing, Windows serial diagnostics, and other enhanced features. Our Linux and QNX utilities are also included to simplify installation.

4 PORT PCI RS-232/422/485 Back to 4 Port

View The 7904 User Manual (PDF) Download The Serial Utility Disk

• Four port field selectable RS-232/422/485 interface
• Automatic RS-485 Enable and Disable
• Hot Swap compliant (PICMG 2.1 Rev. 3.0)
• PCI bus 2.1 compliant
• Universal 3.3 and 5V compatible
• Full RS-232 control signals supported
• 16850 buffered UART standard
• Supports date rates up to 921.6K bps (RS-422)
• RS-422/485 control signals include TD, RD, RTS, CTS
• Termination options: switches in/out for RD resistor
• Failsafe biasing via pullup/pulldown