ProSoft Technology 5201-DFNT-104S - Manual (Page 77)

IEC-60870-5-104 (104S) Protocol Implementation 104S v2 ♦ ProLinx Gateway
Protocol Manual (Firmware v2.xx)
ProSoft Technology, Inc.
Page 77 of 157
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 104S v2 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
104S v2 gateway associates each Monitor Measured point with a Parameter
point using Parameter Offset entries:
March 19, 2010