The Module may require a Software "Z" command (Initialize) right after
power-up before it will respond. Sometimes modules come up in an undefined
state upon power-up. This state can keep the module from accepting any
commands. As an example, an internal clear could be latched on within
the GATE ARRAY. All Function commands are ignored because of this.
An Initialize (Z) will release this and re-set the module to it's default
Sometimes a hardware "Z" from a switch on the crate controller, does not
work properly. It may bounce or not include strobe pulses (S1 and
S2). Our modules use the timing of the strobe pulses in conjunction
with the "Z" line to enable and clock the internal circuitry of the GATE
ARRAY to re-set the module properly.