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13�1 Der Com-Server als UDP-Peer
UDP is a connection-less and unsecured datagram service.
During data transmission there is no fixed connection bet-
ween the communicating network stations. Datagrams are
addressed to the destination in the network without there
being any reply referencing the success or failure of the sen-
ding. Any repetition of lost data packets is solely the respon-
sibility of higher level protocols.
Data direction network r serial
Due to the connectionless functionality of UDP the Com-Server
port must always be configured for data exchange using UDP
datagrams. This can be accomplished either by setting up a
static destination host or by activating serial addressing using
the option Client:“C“+address.
If the Com-Server is configured in this way as a UDP client, all
UDP datagrams which are addressed to the configured local
port number are accepted. The data range of the UDP proto-
col is send transparent to the serially connected device.
Data direction serial r network
There are two ways to specify the network destination for re-
ceived serial data. One is static using the menu items ...UDP
Client r Server Port and Server IP/URL. Alternately the option
Client:“C“+Addr. can be enabled, whereby the destination pa-
rameter IP address and JURL and port number are expected in
the serial data stream before the actual user data.
Packeting of the serial data into corresponding UDP data-
grams can be affected using the various functions of Packet
Options.
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