RuggedCom RuggedRouter RX1100 - Manual (Page 225)

24. Configuring Serial Protocols
Revision 1.14.3 225 RX1000/RX1100™
The Response Timer field configures the maximum time from the last transmitted character of the
outgoing poll until the first character of the response. If the RTU does not respond in this time the poll
will have been considered failed. The Response Timer must be between 50 and 1000 milliseconds
inclusive.
The Pack Timer field configures the maximum allowable time to wait for a response to a Modbus
request to complete once it has started. The Pack Timer must be between 200 and 1000 milliseconds
inclusive.
Note
The Modbus specification states the minimum time is about 640 character times at baud rates
below 19200 Kbps and 256 char times + 192 ms at baud rates above 19200 Kbps. You may
specify a larger value if you think your RTU will take longer to complete transmission than the
calculated time.
The Turnaround field configures the amount of delay (if any) to insert after the transmissions of
Modbus broadcast messages out the serial port. The Turnaround must be between 1 and 1000
milliseconds inclusive, or off.
The Retransmits field configures the number of times to retransmit the request to the RTU before
giving up, should the original attempt fail.
The Max Conns field configures the maximum number of incoming connections.
The Local Port field may be used to specify an alternate local TCP port number. If this field is
configured, a single connection (per serial port) may be made to this alternate port number. Note that
TCP Modbus uses a default local port number of 502. There is no limit imposed on the number of
connections to the default TCP port.
24.2.6. DNP Menu
Figure 24.7. DNP Settings
The Address Learning field may be set to 'Disabled' or to an Ethernet interface name.
The Aging Timer sets the length of time which a learned DNP device in the Device Address Table
may go without any DNP communication before it is removed from the table.