... 2,500VDC EFT Surge Protection 2,500VDC Isolation protection for RS-422/485 (PCI-1602UP ... , Linux 2,500VDC EFT Surge Protection 2,500VDC Isolation protection for RS-422/485 (PCI-1602UP) Interrupt ... 1610AUP provide 4 RS-232 ports.To improve system performance, all cards allowtransmission rates up to 921 ... the cards offer EFT surge protection, protecting your system from abrupt high voltages up to 2,500 VDC ...