ZWave Versions

ZWave 4.27 - Serial API 2.40: 2008-06-02 stable, but no security

ZWave 5.02 - Serial API 2.48: 2008-08-15 first support for security, not stable

ZWave 5.02 sp2 - Serial API 2.64: 2009-01-13 fixed most bugs, but still had problem with tx buffer dying

ZWave 5.02 sp3 - Serial API 2.78: 2009-07-10 stable version that supports security