American Fibertek Net I/O N-664 - Manual (Page 11)

11
Connecting an aux output
Each contact block has three terminals which are used for the aux contact out function.
Viewing the rear of the N-664, these three terminals are the upper three of each 5 pin
terminal block. Each contact output is a form C contact closure. The topmost terminal
(labeled ‘C’) is the Common terminal on the form C. The second terminal (labeled ‘NC’)
is the Normally Closed contact, and the third (labeled ‘NO’) is the Normally Open
contact.
To connect an external device to an aux contact out on the N-664, use two wires, 16-28
AWG in size. Strip about ¼” of the insulation from the end of the wires before inserting
them into the terminal blocks. Tighten the terminal screws to secure the wires in the
terminal block.
Normally Open Aux Contact Out Normally Closed Aux Contact Out
When an output is not active, the Common terminal will be electrically connected inside
the N-664 to the Normally Closed terminal. When the output becomes active, the
connection between the Common terminal and the Normally Closed terminal will be
broken, and a connection will then be made inside the N-664 between the C terminal
and the Normally Open terminal.
The Aux Output terminals are electrically isolated from the N-664 and from each other,
and can be safely connected to external power sources or grounds.