6 Configure the Operation Modes
6.2.2.2.4 Null Modem Tunnel
This operation mode is intended to build a long virtual Null
Modem Cable between the serial ports of two NetCom
+
. This mode is symmetric, both NetCom
+
operate as server and as client at the same time. The parameters of the serial port are defined on
the NetCom
+
, as given above (
3.1
).
Mode
Null Modem Tunnel
Server
TCP Port(Control)
[2000 ]
TCP Port(Data)
[2001 ]
Client
Destination
[
]
TCP Port(Control)
[2000 ]
TCP Port(Data)
[2001 ]
Connect
Triggered
ShortHoldTime
[0
]
KeepAliveMode
On Connect
KeepAliveInterval
[0
]
Figure 79: Null Modem Tunnel
This is a mixed mode, requiring parameters for server function and for the client part.
The
NetCom
+
operates as a server while accepting connections in Driver Mode (
6.2.2.2.1
). If there is
no current connection, the NetCom
+
may establish a connection as a client. This is also a special
connection, using the Driver Mode protocol. NetCom
+
will not only transmit serial data in both
directions, it will also pass information about the current settings of the Modem Status lines. And
it will itself set the Modem Control lines as required by the other host. The CTS is connected to
the RTS of the partner, and DSR connects to DTR. Since this operation requires another NetCom
+
to accept the connection, both NetCom
+
together operate as a long Null-Modem cable. The data
is sent via a tunnel through the network.
September 2016
NetCom Plus User Manual
80
Summary of Contents for NetCom Plus 111
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