Chapter 2: Installation 
24  NS3552-8P-2S-V2 User Manual 
 
Note:  
1.  The wire gauge for the terminal block should be in the range of 12 to 24 AWG. 
2.  When performing any of the procedures such as inserting the wires or tightening the 
wire-clamp screws, make sure the power is OFF to avoid electrical shock. 
Wiring the digital input/output 
The 6-contact terminal block connector on the rear panel of the industrial managed 
switch is used for digital input and digital output. Please follow the steps below to insert 
wires. 
1.  The industrial managed switch offers two DI and DO groups. 1 and 2 are DI groups; 
3 and 4 are DO groups; and 5 and 6 are GND (ground). 
 
2.  Tighten the wire-clamp screws for preventing the wires from loosening.