Jetter JC-120MC, User Manual

Page: 490 / 634

490 Jetter AG
10 Programming
The task stops at the program line until the connection is established or the
specified timeout has elapsed. This function is processed in the following
steps:
Step Description
1 The device JC-120MC sets up TCP/IP port 46000 for receiving connection
requests.
2 If ... ... then ...
the network client has established
a connection,
no further connection requests to
this port are accepted, the function
is terminated and a positive value is
returned as handle for further
access to the connection.
the connection could not be
established and the timeout
of 100 seconds has not elapsed
yet,
the system waits for a connection to
be established.
an error has occurred or the
timeout has elapsed,
the function is terminated and a
negative value is returned.
If a client is to establish a UDP/IP connection to a server, you can invoke the
function and assign the return value of a variable for further evaluation as
follows:
Result := ConnectionCreate(CONNTYPE_CLIENT,
IPTYPE_UDP,
0 ,
0 ,
0 );
UDP is a connectionless communication mode. For this reason, the device
JC-120MC opens only one communication channel for sending data to a
network client. This function is processed in the following steps:
Step Description
1
The device JC-120MC sets up a UDP/IP communication channel for
sending data.
2 If ... ... then ...
no error has occurred, the function is terminated and a
positive value is returned as handle
for further access to the connection.
an error has occurred, the function is terminated and a
negative value is returned.
Functioning principle
with a TCP/IP server
Using this function with
a UDP/IP client
Functioning principle
with a UDP/IP client