Theory Of Operation - HMS Anybus X-gateway User Manual

Theory of Operation

The JMI provides centralized data storage, the "PassageWay
shared between the J1939 and Modbus networks. Data is placed into the Passage-
Way by one network interface, allowing the data to be read through the other net-
work interface.
The JMI appears as a single device on either network using standard protocol
mechanisms. No special, or extended, protocol features are required of the devices
on either network to read and write the data flowing through the PassageWay; all
cross-network activity is transparent to the devices on either network.
© 2012 HMS Industrial Networks AB
PassageWay
Read Inputs
Write Outputs
Figure 1-1 JMI PassageWay Operation
Anybus X-gateway Module Description
Receive PGNs
Input
Table
Send PGNs
Output
Table
1-2
TM
", for data that is
Doc.Id. HMSI-168-25