The Interlogix NX-6 and NX-8 are capable of keyswitch, however, the NX4 is not
'*8'-Enter programming state > Master code - ('9713' is default) > '0#'-Program current keypad > '25#' Location-Zone Type > '*' - to cycle through each zone...select '11' : keyswitch, for desired zone, finish cycling through using '*' > 'Exit' > 'Exit'
Is the Concord 4 capable?