5-2Peer-to-Peer Messaging

The table below illustrates the relationship between messages and their corresponding configuration addresses.

Table 5.1 Message Routing

ENI receives read or

ENI TCP/IP route

Message forwarded to destination

write PCCC message to

configuration

node TCP/IP address

 

 

 

Node 0

Node100

111.222.233.200 (stored at Node 100)

 

 

 

Node 1

Node101

111.222.233.201 (stored at Node 101)

 

 

 

 

When the ENI receives a PCCC write message to a

IMPORTANT

configuration node address (100 through 149), it

 

 

 

closes any open communications currently active on

 

that connection and reconfigures the IP address to

 

match the new configuration.

If the received data matches the current configuration, the ENI closes any open communications with the destination device.

If the ENI receives a PCCC read message to any of its configuration addresses (nodes 100 to 149), the ENI responds with the current configuration of that node/address.

Using the configuration shown in Table 5-2;if the controller initiates a read or write message to node 0, the ENI forwards the request to the TCP/IP address at Node 100 (111.222.233.200).

Publication 1761-UM006A-EN-P - February 2001