def to_redfish_version(ver32):
    """
    Converts a PLDM ver32 number to a Redfish version in the format vMajor_Minor_Errata
    """
    if ver32 == 0xFFFFFFFF:  # un-versioned
        return ''
    else:
        return 'v'+str((ver32 >> 24) & 0x0F)+'_'+str((ver32 >> 16) & 0x0F)+'_'+str((ver32 >> 8) & 0x0F)