SSE232-IA User’s Manual
Exemys
www.exemys.com
Rev. 4
Page31
UDP
Client
E T H E R N E T
UDP
Server
Data ( lost )
RS-232
E T H E R N E T
RS-232
(1) Without any established connection any data is lost
First Datagram
(2) The client sends the first Datagram to establish connection
E T H E R N E T
RS-232
(3) Once connection is established all data is transmitted
Data
Data
A
B
A
B
A
B
A
B
A
B
A
B
UDP
Client
UDP
Server
UDP
Client
UDP
Server
Figure
Figure
Figure
Figure 12
12
12
12 ---- Two SSE232
Two SSE232
Two SSE232
Two SSE232----IA UDP, one client and one server
IA UDP, one client and one server
IA UDP, one client and one server
IA UDP, one client and one server
When two SSE232-IA connect through an UDP Transport Protocol, one of them in Client Mode
and the other in Server Mode, the SSE232-IA device running in Server mode will not send any
serial data to the Client’s IP unless the client has previously sent a packet to establish
communication. In other words, the SSE232-IA Server will have to receive a UDP packet from the
client to be linked to that IP. After that, the data available at the serial port will be transmitted to
the client’s IP.
If the client fails to send a packet to the server, the server will not be able to establish a link and
the data received by the corresponding serial will be lost.
3.3.3
3.3.3
3.3.3
3.3.3
Connection Between Two UDP Clients.
Connection Between Two UDP Clients.
Connection Between Two UDP Clients.
Connection Between Two UDP Clients.
The UDP mode, as different from TCP mode, allows communication between two devices
configured on Client Mode. This mode shows an advantage over client-server topology, since
connection can be established in both ways, disregarding which devices starts sending data.
In this case, both devices must be configured in Client Mode and the IPSERV and PORTSERV of
the other device must be also configured.
