User manual

PTQ-104S Rev2 ♦ Quantum Platform Reference
IEC 60870-5-104 Server for Quantum User Manual
ProSoft Technology, Inc. Page 153 of 195
February 22, 2013
STARTDT & STOPDT
STARTDT (Start Data Transfer) and STOPDT (Stop Data Transfer) are used by
the client to control the data transfer from the PTQ-104S 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 by 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:
If this parameter is set to YES (1), the module will ignore the STARTDT and
STOPDT requests by the Client unit.