In cases where you have a series of boards like this and you want a 'master' unit to control the reset of the 'slave' boards, it might be more stable/reliable to wire external pull down resistors on the slave units reset pins that the master could then pull high using a digital output pin. That way the default for the slave units would be held in the reset state, even if the master board is reset or powered down or being reprogramed or whatever.
Lefty