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.
Summary of Contents for Argus 7SR21
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