Class 512-1023 are reserved for events that should stay in the Level 2 network but that in all other aspects (the lower nine bits + type) are defined in the same manner as for Level I. For CLASS2.PROTOCOLL1 the first 16 bytes of the datafield is the GUID of the node the event is intended for.

This is used for translation in the VSCP daemon for instance where a level II client can send events that are automatically sent to the correct interface and is adressed to the correct device in question. To use this feature send events with the GUID of the i/f where the device is located when addressing is needed. The correct nickname is needed and it should be set in GUID byte 16.

An event with a class >= 512 but < 1024 will be sent to all Level II clients and to the correct i/f (the one that have the addressed GUID). A response form the device will go out as as a Level II event using the GUID of the interface but class will always have a value < 512 for a response event just as all events originating from a device.

Note that the LSB of an interface GUID is always the nickname id for a device interface.

To set a new nickname for a node send the following event

Class = 512  = Level I Protocol
Type = 6 (0x06) Set Nickname id for node.
Data byte 0-15: GUID for Interface where node is located.
Data byte 16: Old nickname for node.
Data Byte 17: The nickname for the node.

Response is

Class = 0  = Level I Protocol
Type = 7 (0x07) Nickname id accepted.
No data bytes

Note the the LSB of the GUID contains the nickname is in both cases but that this is of no use when the event is sent but should be used to veryfy that the correct node answered when the response is received.

To read a register of a node send the following event

Class = 512  = Level I Protocol
Type = 9 (0x09) Read register.
Data byte 0-15: GUID for Interface where node is located. LSB is nickname for node.
Data byte 16: Nickname for node.
Data Byte 17: Register to read.

Response is

Class = 0  = Level I Protocol
Type=10 (0x0A) Read/Write response.
Data byte 0: Register read/written.
Data Byte 1: Content of register.