ProSoft Technology PTQ-104S - Manual (Page 163)

48TPTQ-104S Rev 1 ♦ 47TQuantum Platform Reference
46TIEC 60870-5-104 Server for Quantum 12TUser Manual
The protocol specification explains that the qualifier value for these commands
should be configured as:
Bits Value Description
1 to 6 0 Not Used
1
Threshold Value (Deadband)
2 Smoothing Factor (filter time constant) - Not Supported
3 Low Limit Transmission of Measured Value
4 High Limit Transmission of Measured Value
5..31 Reserved
7 0 No Change
1 Change
8 0 Operation
1 Not in Operation
For the PTQ-104S gateway, the Low Limit and High Limit parameters cannot be
changed by command, because these values are calculated as follows:
Low Limit = (LAST REPORTED VALUE) - Deadband
High Limit = (LAST REPORTED VALUE) + Deadband
These commands must be sent to a specific Information Object Address. The
PTQ-104S gateway associates each Monitor Measured point with a Parameter
point using Parameter Offset entries:
ProSoft Technology, Inc. Page 163 of 201
March 4, 2013