RuggedCom RuggedRouter RX1000 - Manual (Page 190)

RuggedRouter  User Guide
If configured to packetize on a timeout, the server will wait for a configurable time
after receiving a character before packetizing and forwarding. If another character
arrives during the waiting interval, the timer is restarted. This method allows
characters transmitted as part of an entire message to be forwarded to network in a
single packet, when the timer expires after receiving the very last character of the
message. This is usually the only packetizer selected when supporting ModBus
communications.
Finally, the server will always packetize and forward on a full packet, i.e. when the
number of characters fills its communications buffer (1024 bytes).
Use of Turnaround Delays
Some RTU protocols (such as ModBus) use the concept of a turnaround delay. When
the host sends a message (such as a broadcast) that does not invoke an RTU response,
it waits a turnaround delay time. This delay ensures that the RTU has time to process
the broadcast message before it has to receive the next poll.
When polling is performed, network delays may cause the broadcast and next poll to
arrive at the remote server at the same time. Configuring a turnaround delay will
enforce a minimum separation time between each message sent out the port. Note
that turnaround delays do not need to be configured at the host computer side and
may be disabled there.
Serial Protocols Main Menu
Figure 158: Serial Protocols Server Main Menu
Note that the Serial Protocols server is disabled by default and may be enabled via the
System folder, Bootup And Shutdown menu.
The Assign Protocols menu assigns a serial protocol to one of your serial ports.
The Port Settings menu configures the serial port and its electrical protocol.
If any of your serial ports are configured as RawSocket protocol, this menu will
configure them.
The Serial Protocols Statistics menu will show you the status and statistics for any
established sessions.
The Line Trace menu will provide a line activity trace for the serial ports.
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