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FS-8704-12 GE-EGD Driver Manual Page 8 of 23

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5.3.2 Driver Specific Map Descriptor Parameters

Column Title

Function

Legal Values

Node_Name

Name of Node to fetch data from

One of the node names

specified in Section 5.2

Length

Number of points being consumed. For Bit values this

represents the number of bytes (i.e. number of points divided

by 8)

1 - 1000

Ge_ProducerId

This identifies the GE device producing the EGD data.

Although in decimal dot format, it is not an IP address and

does not necessarily correspond to the IP address of the GE-

Ethernet port producing the message. It corresponds to the

producer ID configured for the CPU producing the data.

The default value is typically the same as the IP address of the

producer but the value can be changed and it is possible for

one device to have multiple Ethernet interfaces and hence

multiple IP addresses.

Any change to the producerID must be matched by a similar

change in the consumer's configuration.

Nnn.nnn.nnn.nnn

Where nnn are in the range

0-255.

Ge_ExchangeId

Used with the ProducerID, to uniquely identify a packet of EGD

data. The driver uses these two parameters to match a

produced data packet with one or more passive Map

Descriptors.

Integer values >= 1

Ge_Data_Type*

Each produced data packet contains raw packed data. Nothing

in the message identifies the structure or type of the incoming

data. The Driver therefore cannot differentiate between byte,

integer, real ... numbers and requires the specification of this

keyword to unpack the data buffer.

Byte, Bit, Word, Dword, Int ,

Long, Float (4 byte IEEE real

number) or Double (8 byte

IEEE real number).

Ge_Offset*

If the producer has been configured to produce data of

multiple types in one data packet then multiple Map

Descriptors are required to decode them. The Ge_Offset is

used to point to the first byte in the data packet to be

processed by the Map Descriptor. Typically the Map

Descriptor for the 2nd, 3rd ... Map Descriptors associated with

one data packet will be non-zero.

0, Any positive integer

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 22 23

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