PLX3x Series MBTCP Protocol
Ethernet and Serial Gateways User Manual
ProSoft Technology, Inc. Page 97 of 218
May 26, 2016
The following virtual addresses are not part of the normal gateway user database
and are not valid addresses for standard data. However, these addresses may
be used for incoming commands that are requesting floating-point data.
To use addresses in this upper range requires the following
Set the Float Flag in the MBTCP server configuration to Yes
Set the Float Start to a database address in the range below
Set the Float Offset to a database address in the gateway user memory
area shown above.
Remember that, once this is done, all data above the Float Start address must be
floating-point data.
The MBTCP gateway must be correctly configured and connected to the network
before any attempt is made to use it. Use a network verification program, such as
ProSoft Discovery Service or the command prompt PING instruction, to verify
that the gateway can be seen on the network. Use ProSoft Configuration Builder
to confirm proper configuration of the gateway and to transfer the configuration
files to and from the gateway.
Modbus Message Routing: Port 2001
When Modbus messages are sent to the Gateway over the TCP/IP connection to
port 2001, the messages are sent (routed in the Gateway) directly out the serial
communication port (Port 0, if it is configured as a Modbus Master. The
commands (whether a read or a write command) are immediately routed to the
slave devices on the serial port. Response messages from the slave devices are
routed to the TCP/IP network to be received by the originating host.
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