ProSoft Technology 5201-MNET-101S - Manual (Page 82)

Reference IEC-101 Slave ♦ ProLinx Communication Gateway
Protocol Manual IEC 60870-5-101 v3 Slave (Firmware version 3.xx)
Page 82 of 159 ProSoft Technology, Inc.
August 6, 2010
Monitor Data Transfer
In unbalanced mode, the polling procedure is initiated from the Master unit
through Class 1 and Class 2 requests. In general, ASDUs containing
periodic(cyclic) causes of transmission are typically assigned to be transmitted in
response to Class 2 requests from the Master. All ASDUs containing time-tagged
or spontaneous causes of transmission are typically assigned to be transmitted in
response to Class 1 requests. Other ASDUs with other causes of transmission of
low priority, such as background scans, may also be assigned to be transmitted
in response to Class 2 requests.
Typically, you should properly configure the group code (page 50) for each
monitor point to define how the Master will poll for the point.
The gateway will periodically send all points configured for periodic/cyclic poll
(0x80000000) at every x milliseconds, where x is configured with the Cyclic Data
Transmission parameter: