When you specify sendcontrol=sendmst, communication with the target Datareplicator is established and broken at the specified transmission interval. However, if there is no update information to be sent when the transmission interval is reached, connection or disconnection processing does not occur. Therefore, when sendcontrol=sendmst is specified, the following operation is different from when sendcontrol=nodemst is specified:

• The target Datareplicator does not detect the communication line status between transmission intervals (while communication with the target Datareplicator is off).
• If you execute the normal termination command (hdsstop) on the target Datareplicator before sending any update information to it after the transmission processing start request, the target Datareplicator terminates itself without waiting for termination of the source Datareplicator.

If an error occurs in a transmission process due to a memory shortage while transmission is underway, the source Datareplicator cancels transmission processing for the corresponding destination and suppresses reutilization of this transmission process. To reuse this transmission process, you must restart the source Datareplicator.