RuggedCom RuggedRouter RX1100 - Manual (Page 222)

24. Configuring Serial Protocols
Revision 1.14.3 222 RX1000/RX1100™
When a message with an unknown DNP source address is received on a local serial port, the DNP
source address and serial port number are entered into the Device Address Table. When a message
with an unknown DNP source address is received from the IP network, on the IP interface that is
configured as the DNP learning interface, the DNP source address and the IP address of the sender
are entered into the Device Address Table.
When a message with an unknown DNP destination address is received on a local serial port, the
message is sent in a UDP broadcast out the network interface configured as the DNP learning
interface. When a message with an unknown DNP destination address is received from the IP network,
it is sent to all local serial ports configured as DNP ports.
UDP transport is used during the DNP address learning phase.
All learned addresses will be kept in the Device Address Table, which is saved in non-volatile memory,
which makes it unnecessary to repeat the DNP address learning process across a RuggedRouter
reboot or accidental power loss.
An aging timer is maintained per DNP address in the table, and is reset whenever a DNP message
is sent to or received for the specified address.
This learning facility makes it possible to configure the DNP3 protocol with a minimum number of
parameters: a TCP/UDP port number, a learning network interface and an aging timer.
24.1.6.2. DNP Broadcast Messages
DNP addresses 65521 through 65535 are reserved as DNP3 broadcast addresses. RuggedRouter
supports DNP3 broadcast messages. DNP broadcast messages received on local serial ports are
transmitted to all IP Addresses in the DNP Device Address Table (whether learned or statically
configured). When a DNP broadcast message is received from the IP network, it is transmitted on all
local serial ports configured as DNP ports.
24.2. Serial Protocols Configuration
24.2.1. Serial Protocols Main Menu
Figure 24.2. Serial Protocols Server Main Menu