ProSoft Technology 5205-104S-PDPS - Manual (Page 51)

Protocol Implementation 4205/5205-TS-104S-PDPS ♦ ProLinx Standalone
IEC-60870-5-104 to PDPS Communication Module with Time Stamp
ProSoft Technology, Inc. Page 51 of 128
July 12, 2007
STARTDT & STOPDT
STARTDT (Start Data Transfer) and STOPDT (Stop Data Transfer) are used by
the client to control the data transfer from the 4205/5205-TS-104S-PDPS
module. When the connection is established, user data is not automatically
enabled in the server until it receives a STARTDT act request from the client.
The server should respond with a STARTDT con response to acknowledge the
client request. Once this procedure is concluded, the server can send monitor
data to the client.
The client can interrupt the monitor data flow at any time sending a STOPDT act
command to the server.
In some circumstances the client unit may not support STARTDT and STOPDT
messages. The module may also be tested with simulator software that does not
support these features. During these situations, you may want to disable the
STARTDT and STOPDT features using the following parameter:
Override StartDT : 1 #Used to ignore STARTDT/STOPDT state (0=No, 1=Yes)
If this parameter is set to 1, the module will ignore the STARTDT and STOPDT
requests by the client unit.
TESTFR Requests
Connections that are unused (but opened) may be periodically tested in both
directions by sending test messages (TESTFR=act) which are confirmed by the
receiving station sending TESTFR=con messages. The 4205/5205-TS-104S-
PDPS module can be configured to periodically send this message using the
following parameter:
t3 timeout set value : 30 #timeout for test frame on idle state