• NC is Normally Closed
• C is Common
• NO is Normally Open
The VBB-NRI G2 has four unsupervised contact points. Unsupervised door contacts have maximum wire length of
2,000 feet.
5 Contact Inputs 1 & 2
• 1 is Exit Request (REX) – N/O
• 2 is Door Position Switch (DOD) – N/C
• C is Ground
6 Contact Inputs 3 & 4
• 3 is Push Button Override – N/O
• 4 is Auxiliary Input – N/C
• C is Ground
7 & 9 Read Head Connection
▪ 1 is LED
▪ 2 is Not Used
▪ C is Not Used
▪ A is CLK (Data 0)
▪ B is DAT (Data 1)
▪ - is Ground
▪ + is Power
8 & 10 Not Used
11 Not Used
19 Not Used
20 Not Used
21 Not Used
22 Not Used
23 Read Head Voltage Selector. The VBB-NRI G2 read head voltage selector provides wither 12 VDC or passes
VIN to the read head depending on jumper location.
▪ A jumper across PINs 2 and 3 (12V) will provide 12 VDC (default setting)
▪ A jumper across PINs 1 (Vin) and 2 will pass VIN
▪ No jumper will provide 0 VDC
Warning: Serious damage may occur to the read-head if this jumper is set incorrectly. Please check the read
head voltage requirements.
16 Configure network functionality.
Refer to Configure GUI section above.
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