PLX3x Series ♦ Multi-Protocol Gateways
EIP Protocol
User Manual
ProSoft Technology, Inc.
Page 51 of 215
January 25, 2018
5.1.2 EIP Internal Database
The internal database is central to the functionality of the PLX3x gateway. The
gateway shares this database between all the communications ports on the
gateway and uses it as a conduit to pass information from one protocol to
another device on one network to one or more devices on another network. This
permits data from devices on one communication port to be accessed and
controlled by devices on another communication port.
In addition to data from the client and server, you can map status and error
information generated by the gateway into the user data area of the internal
database. The internal database is divided into two areas:
Upper memory for the module status data area. This is where the module
writes internal status data for the protocols supported by the module.
Lower memory for the user data area. This is where incoming data from
external devices is stored and accessed.
Either protocol in the PLX3x gateway can write data to and read data from the
user data area.
If the module is acting as a client/master, you create commands to read data
from external client/server devices and store the data in a specific location in
the user data area.
If the module is acting as a server/slave, the external client/master devices
write data to a specific location in the user data area.
