ProSoft Technology 5201-DFNT-104S - Manual (Page 73)

IEC-60870-5-104 (104S) Protocol Implementation 104S v2 ♦ ProLinx Gateway
Protocol Manual (Firmware v2.xx)
ProSoft Technology, Inc.
Page 73 of 157
3.5.3 TESTFR Requests
Connections that are unused (but opened) may be periodically tested in both
directions by sending test messages (TESTFR=act) which are confirmed by the
receiving station sending TESTFR=con messages. The 104S v2 gateway can be
configured to periodically send this message using the following parameter:
In the example above, the gateway would send a TESTFR.ACT message 30
seconds after receiving the last message:
March 19, 2010