ADLINK PCI-7251 - Manual (Page 6)

ii Table of Contents
LPCI/LPCIe-7250 CN1 Pin Assignment ....................... 27
2.7 PCI-7250 and PCI-7251 Connection ................................. 28
3 Registers............................................................................ 29
3.1 PCI PnP Registers ............................................................. 29
3.2 I/O Address Map ................................................................ 30
3.3 Relay Output and Readback Registers.............................. 30
3.4 Isolation Input Registers .................................................... 31
4 Operation Theory .............................................................. 33
4.1 Using Relay Output............................................................ 33
4.2 Using Isolated Input ........................................................... 35
Appendix ................................................................................ 37
Relay Contact Protection Circuits ...................................... 37
RC Circuit ..................................................................... 37
Diode Circuit ................................................................. 38
Diode & Zener diode Circuit .......................................... 39
Varistor Circuit .............................................................. 39