7SR220 Technical Manual
Chapter 4 - Page 20 of 96 © 2017 Siemens Protection Devices Limited
3.2 Cause of Transmission
The cause of transmission (COT) column of the “Information Number and Function” table lists possible causes of
transmission for these frames. The following abbreviations are used:
Abbreviation Description
SE spontaneous event
T test mode
GI general interrogation
Loc local operation
Rem remote operation
Ack command acknowledge
Nak Negative command acknowledge
Note: Events listing a GI cause of transmission can be raised and cleared; other events are raised only.
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