Using the MSS Serial Tunnel
5-7
5.3 Serial Tunnel
Two MSS servers can be connected to emulate a direct serial connection across a LAN or
WAN. Servers connected in this way can pass data only—they will not be able to pass
status signals (DSR/DTR, CTS/RTS, etc.) or preserve timing between characters. The basic
network configuration for this virtual serial line is shown in Figure 5-6.
Figure 5-6: Back-to-Back MSS Connections
5.3.1 TCP Configuration
Assuming the MSS network and serial port parameters have been configured properly, the
Servers would be configured as follows:
MSS_A (192.168.5.2) Local>> CHANGE DEDICATED TCP 192.168.5.10:3001T
Local>> CHANGE AUTOSTART ENABLED
MSS_B (192.168.5.10) Local>> CHANGE ACCESS REMOTE
Local>> CHANGE DEDICATED NONE
Local>> CHANGE AUTOSTART DISABLED
Note:
If the Servers are on different IP subnets, configure the default
gateway on each unit with the Change Gateway command.
The above commands create a raw (8-bit clean) TCP connection between the serial ports
of the two MSS’s once the units have been power-cycled. The commands for MSS_A
ensure that it will automatically connect to MSS_B each time it is booted. The commands
for MSS_B ensure that it is always available to accept connections from MSS_A.
5.3.2 UDP Configuration
When the UDP protocol is used, there is no connection; each MSS must be told explicitly
which host it is allowed to accept packets from. Each MSS would have to be configured to
both send packets to and accept packets from the other MSS.
MSS_A (192.168.5.2) Local>> CHANGE DEDICATED TCP 192.168.5.10:4096U
Local>> CHANGE AUTOSTART ENABLED
Local>> CHANGE ACCESS DYNAMIC
Serial Device
Serial Device
AB
Ethernet
192.168.5.2 192.168.5.10
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