Service Channel (channel 0) (Internal Node)

Registers in Service channel.

RegNo	Identifier	Memory type	Read Out	Type
0	NumberOfSWNo	Stream Read Only	-------	Integer
1	DeviceID	Stream Read Only	-------	Record
2	NeighbourNodeAddress	Special function		Byte
3	NetID	Special function		Word
4	PNETSerialNo	Special function	-------	Record
5
6
7	FreeRunTimer	RAM Read only	Decimal	LongInteger
8
9
10
11
12
13
14	Guid	Stream Read Only	-------	String
15

RegNo 0: NumberOfSWNo

This constant holds the highest SWNo in the device.

NumberOfSWNo:

Integer;

RegNo 1: DeviceID

The purpose of this record is to be able to identify a connected device. The record includes registered manufacturer number, the type number of the device and a string identifying the manufacturer.

The record is of the following type:

Record			(* Factory setting *)
	DeviceNumber:	Word;	(* 7011 *)
	ProgramVersion:	Word;	(* 1 *)
	ManufacturerNo:	Word;	(* 1 *)
	Manufacturer:	String[20];	(* "PROCES-DATA DK" *)
End;

RegNo 2: NeighbourNodeAddress

NeighbourNodeAddress: Byte;

A node can have a "neighbour" node, of any general node type. To facilitate NetScan and other utilities, the node address of the neighbour node can be read in this "Read only" variable. If the node has no neighbour node, the value of NeighbourNodeAddress is 255.

RegNo 3: NetID

NetID: Word;

This register holds the NetID. The value identifies the net the node is connected to.

Note: This register does not exist in the UDP node

RegNo 4: PNETSerialNo

This variable is a record of the following type:

Record			(* Factory setting *)
	PNETNo:	Byte;	(Node Address) (* 0 *)
	SerialNo:	String[20];	(* "xxxxxxxxPD" *)
End;

The serial number is used for service purposes and as a 'key' to setting the device's P-NET Node address.

A special function is included for identifying a device connected to a network containing many other devices, having the same or unknown node addresses, and to enable a change of the node address via the P-NET.

Setting a new node address via the P-NET is performed by writing the required node address together with the serial number of the device in question, into the PNETSerialNo at node address 126 Dec. (calling all devices). All devices on the P-NET will receive the message, but only the device with the transmitted serial number will store the P-NET node address.

RegNo 7: FreeRunTimer

FreeRunTimer:

LongInteger;

FreeRunTimer is a timer, to which internal events are synchronized. The timer is of type LongInteger in 1/256 Second.

RegNo 14: Guid

Guid:

String[22];

Each channel type is identified by means of a unique Guid. The value of Guid for the Service channel is: PD/551305-01