Beijer Electronics SCOM Protocol EN - Manual (Page 11)

Ethernet Communication
Elektronik-Systeme Lauer, MAEN976 11
UDP
UDP (User Datagram Protocol) is a connectionless protocol.
SCOM messages are encapsulated within UDP, which allows sending and receiving
them via Ethernet.
Connectionless means that no individual destination address is specified. Instead,
UDP packets are sent to the predefined broadcast address 255.255.255.255, at
which any Lauer Navigation Monitor listens. Individual addressing is done in the up-
per protocol layers, such as SCOM and TCP/IP.
Ports Used to Send and Receive Data
Two ports are used to send and receive data:
• UDP receive port
• UDP send port
From the Lauer Navigation Monitor perspective, commands are received from the re-
ceive port and responses are sent to the send port. Thus, a remote controller software
must send commands to the receive port and receive responses from the send port.
If a Lauer Navigation Monitor acts as a remote controller, it also sends commands to
the receive port, because remote controlled monitors always listen to this port to get
commands.
TCP/IP
In contrast to UDP, TCP/IP (Transmission Control Protocol/Internet Protocol) uses
a network address assigned to each participant in a network. Lauer Navigation Mon-
itor implement TCP/IP to support high level protocols, such as HTTP.
A TCP/IP address and the corresponding subnet mask can be assigned dynamically
or statically.
Dynamic Addressing
Dynamic TCP/IP addressing is made using an by an external DHCP-server.
Static Addressing
Static TCP/IP addressing is made using the built-in HTML configuration pages.
HTTP
Lauer Navigation Monitors use HTTP (Hypertext Transfer Protocol) to provide
HTML-based configuration pages. These pages are exposed through the integrated
web server.
There is no separate configuration option available, since the protocol is stacked
above TCP/IP.
The only option that can be configured is a password, which can be used to protect
some configuration pages.