ProSoft Technology PLX3x Series, Руководство пользователя

Страница: 139 / 215

PLX3x Series ♦ Multi-Protocol Gateways ASCII Protocol
User Manual
ProSoft Technology, Inc. Page 139 of 215
January 25, 2018
8.1.3 ASCII 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: Module memory 0 to 3999. This is
where incoming data from external devices is stored and accessed.
Data can be written to and read from the user data area.

To use the transmit function in the module, you define the starting location in
the user data area for the transmitted data.

To use the receive function in the module, you define the starting location in
the user data area for the received data.