does signal switch comes with latchbolt monitoring

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The signal switch(S) will automatically be installed in an EL1490 and EL1590 devices when built at factory. Red, Green, and Black are the wires to the switch and are shown in the 1490 instructio...
The ND-Series RX,  the L-Series RX and latch monitoring switches are Form C - Single Pole Double Throw (also known as SPDT).
The RX monitors the push bar while the LX monitors the latch bolt of the exit device. A SS device has an LX and a key cylinder switch plus an emergency push bar signage.
DS
SS, LX, RX
SS