Manual

Signal Connection • 9
3
Signal Connection
3.1 PXI-7901 Topology
The PXI-7901 has 16 independent SPDT Relays onboard. Each relay has three
terminals, NC (normally closed), NO (normally opened), and COM (common).
When a relay is in its reset (de-energized) state, the NC connects to COM;
while in set (energized) state, the NO connects to COM. Thus all signal paths
on PXI-7901 are inherently break-before-make.
After power-up, all relays are in their reset (de-energized) state; i.e. NC
connects to COM.
3.2 PXI-7901 Pin assignment & Description
22. COM0
43. NO0 23. COM1 1. NC0
44. NO1 24. COM2 2. NC1
45. NO2 25. COM3 3. NC2
46. NO3 26. COM4 4. NC3
47. NO4 27. COM5 5. NC4
48. NO5 28. COM6 6. NC5
49. NO6 29. COM7 7. NC6
50. NO7 30. COM8 8. NC7
51. NO8 31. COM9 9. NC8
52. NO9 32. COM10 10. NC9
53. NO10 33. COM11 11. NC10
54. NO11 34. COM12 12. NC11
55. NO12 35. COM13 13. NC12
56. NO13 36. COM14 14. NC13
57. NO14 37. COM15 15. NC14
58. NO15 38. NC 16. NC15
59. NC 39. NC 17. NC
60. AUX3 40. AUX4 18. AUX2/SHDNn
61. AUX6 41. +5V out 19. AUX5
62. AUX7 42. AUX1/TRG_IN 20. GND
21. AUX0/S_ADV
Table 1: Pin Assignment