ProSoft Technology 5301-MBP-ASCII - Manual (Page 9)

MBP ♦ ProLinx Gateway Functional Overview
Modbus Plus Protocol Manual
ProSoft Technology, Inc. Page 9 of 52
May 12, 2011
1.2 Module Internal Database
The internal database is central to the functionality of the module. This database
is shared between all the ports on the module and is used as a conduit to pass
information from one device on one network to one or more devices on another
network. This permits data from devices on one communication port to be viewed
and controlled by devices on another port.
In addition to data from the Modbus Plus port, status and error information
generated by the module can also be mapped into the internal database.
1.2.1 Modbus Plus Port Access to Database
The Modbus Plus driver uses the database in two ways:
1 A read command issued to a Modbus Plus device by the driver will return the
foreign device data into the internal database.
2 A write command issued to a Modbus Plus device by the driver will use the
data in the internal database to write to the foreign device.
External Modbus Plus devices can monitor and control data in this database
through the Modbus Plus Port. Setup of the port only requires appropriate values
in the CFG file.