Microhard Systems IPN3G, Руководство по эксплуатации

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4.0 WebUI Configuration
Protocol Config (continued)
Multicast is a one-to-
many transmission of
data over an IP network.
It is an efficient method of
transmitting the same
data to many recipients.
The recipients must me
members of the specific
multicast group.
UDP Point-to-Point: In this configuration the IPn3G will send serial data to a specifically-defined point,
using UDP packets. This same IPn3G will accept UDP packets from that same point.

Remote IP Address
IP address of distant device to which UDP packets are sent when data received at serial port.
Default: 0.0.0.0

Remote Port
UDP port of distant device mentioned above.
Default: 20001

Listening Port
UDP port which the IP Series listens to (monitors). UDP packets received on this port are
forwarded to the unit’s serial port.
Default: 20001
UDP Point-to-Multipoint (P): This mode is configured on an IPn3G which is to send multicast UDP
packets; typically, the MASTER in the IPn3G network.

Multicast IP Address
A valid multicast address this unit uses to send multicast UDP packets upon receiving data
from the serial port. The default value is a good example of a valid multicast address.
Default: 224.1.1.1

Multicast Port
A UDP port that this IPn3G will send UDP packets to. The Multipoint (MP - see the UDP
Point-to-Multipoint (MP) description) stations should be configured to listen to this point in
order to receive multicast packets from this IPn3G.
Default: 20001

Listening Port
The UDP port that this unit receives incoming data on from multiple remote units.
Default: 20011

Time to Live
Time to live for the multicast packets.
Default: 1 (hop)
UDP Point-to-Multipoint (MP): This protocol is selected on the units which are to receive multicast UDP
packets, typically the Remote units. See the previous description of UDP Point-to-Multipoint (P).

Remote IP Address
The IP address of a distant device (IP Series or, for example, a PC) to which the unit
sends UDP packets of data received on the serial port. Most often this is the IP address
of the Master IP Series.
Default:
0.0.0.0

Remote Port
The UDP port associated with the Remote IP Address (above). In the case of this
‘Remote’ being the Master IPn3G, the value in this field should match the Listening Port
of the Master (see UDP Point-to-Multipoint (P)).
Default:
20011
TTL: Time to Live is the
number of hops a packet
can travel before being
discarded.
In the context of multicast,
a TTL value of 1 restricts
the range of the packet to
the same subnet.
A UDP or TCP port is an
application end-point.
The IP address identifies
the device and, as an
extension of the IP
address, the port
essentially ‘fine tunes’
where the data is to go
‘within the device’.
Be careful to select a port
number that is not
predetermined to be
associated with another
application type, e.g.
HTTP uses port 80.