How This Works - VSCOM ModGate Plus User Manual

8 Example Configurations
TCP Connection ID must be a unique number, using just 1, 2, 3, ... is fine.
IP/Host is the definition of the TCP-Master to get access to a serial line.
Direction is Inbound because the TCP-Master initiates the connection.
Port shows 502 as the TCP port on which the ModGate Plus listens.
Once such definitions exist for all planned TCP-Masters, the Line Mapping is to be defined. See
section Serial to TCP (Line Mapping)
Each TCP Connection ID is paired with one Serial Port ID, to establish the connection.

How this works:

The TCP-Masters from the network establish a connection to the ModGate
Plus. Once this is done the source address is compared with the existing definitions. If it exits
in the configuration, all requests from this TCP connection are forwarded to the specified serial
line and the responses are returned. If it does not exist, the requests are either forwarded to port
one, or the connection is cancelled if Allow unknown clients is not enabled. The figure
a setup with two TCP-Masters each talking to a designated line and a serial Slave attached.
Master
IP:
192.168.1.146
TCP ID:1
June 2018
and figure 26.
Modbus/TCP
Master
IP:
192.168.1.152
TCP ID:2
Figure 33: Line mapping for TCP-Masters
ModGate Plus User Manual
Slave
Modbus/RTU
Modbus/ASCII
Port ID: 2
Modbus/RTU
Modbus/ASCII
Port ID: 1
Slave
33 depicts
38