ProSoft Technology MVI69-EGD - Manual (Page 62)

MVI69-EGD ♦ CompactLogix or MicroLogix Platform Reference
GE Ethernet Global Data Communication Module
Page 62 of 96 ProSoft Technology, Inc.
November 3, 2008
5.2.2 EGD Command Server
The module supports UDP service port 7937 (0x1F01) to handle all command
requests made of the module. The module will only service the requests and
generate response messages. It will not generate command requests. The
module supports the following functions specified in the EGD protocol:
Code Description
3 Retrieve Configuration Request (page 63) (example provided)
4 Retrieve Configuration Response (page 63) (example provided)
7 Summary Request (page 67)
8 Summary Response (page 67)
9 Capabilities Request (page 66)
10 Capabilities Response (page 66)
15 Statistics Request (page 69)
16 Statistics Response (page 69)
18 Command NAK (page 70)
32 Read Request (page 71)
33 Read Response (page 71)
34 Write Request (page 73)
35 Write Response (page 73)
36 Masked Write Request (page 75)
37 Masked Write Response (page 75)
The module only supports address type 0 for the read and write commands.
Therefore, the data requested is relative to the EGD exchange delimited in the
request. In order to use these functions, an exchange must first exist in the
module's exchange list defining the database and register count. If the
production/consumption time is set to zero, the exchange will never be produced
or consumed and will only be valid for command processing. These functions
should be used for data that is not time critical and does not require periodic
updating. The maximum length of the message is 1400 bytes.
The module supports the masked write request command to alter one or more
bits. Multiple cells can be provided in the request to alter more than one byte of
data. The maximum length of the message is 1400 bytes.
Refer to EGD Protocol Specific Configuration for information on the data
structures required for each command. Command support is usually not available
in most EGD devices or drivers. Most devices only support the
producer/consumer services. Therefore, this service may not be utilized by those
devices.