Schweitzer Engineering Laboratories SEL-2020 - CLEAR M:n (Access Level 1); CONTROL M (Access Level 2)

5-6 Commands Date Code 20010518
SEL-2020 Instruction Manual
will use the message length to determine the end of the message, instead of checking for an
<ETX> character.
Use the BROADCAST command with an R parameter to enter broadcast communications in a
receive only mode. In this mode, master port messages are used for connection termination only.
Exit broadcast mode by entering the transparent termination sequence defined in the SEL-2020
master port settings. (See Section 6: Settings for additional discussion on termination
sequences.) You will need to allow an extra second for TERTIME1 due to some additional
broadcast command delays.
CLEAR m:n (Access Level 1)
The CLEAR command clears data from the unsolicited message queue or from the archive data
region of an intelligent electronic device (IED) port. Parameter m specifies which port (1
through 16). Parameter n may be BUF for the unsolicited message queue or A1, A2, or A3 for
the appropriate archive. Alternatively, for the archive regions, you may use the data label for the
region (see MAP command). Clearing the unsolicited message queue clears all received
messages from the buffer. Clearing an archive entry removes the oldest item from that archive
queue; subsequent entries will remain. To completely clear an archive queue, add the parameter
A. For example, use: CLEAR 4:A2 A to clear Port 4, Archive 2, all entries.
CAUTION
!
Frequent archive record clearing may exceed EEPROM capabilities.
See the discussion in the Archive Data Region subsection of
Section 9: Database. If you completely clear an archive region that
contains a large number of records (thousands of records), it may
take a few minutes for the clearing to complete. During this time,
most SEL-2020 automatic data collection will be suspended.
CONTROL m (Access Level 2)
You can use the CONTROL command to set (assert), clear (deassert), and pulse (assert and deas-
sert) global element bits R1 through R8. These bits exist in the Global region of the SEL-2020
database. In the example below, executing the CONTROL command controls the global element
bit R5. When you enter the CONTROL command with parameter m to identify the bit number
you want to control, the SEL-2020 asks for an operation; enter: SRB to set the specified bit,
CRB to clear the specified bit, and PRB to pulse the specified bit. Those are the only acceptable
operations. You must again specify the bit you want to control (1 through 8) following the
operation. If you intend to pulse the bit, you can supply a time parameter or a 1 second time is
the default. The example below pulses R5 for 3 seconds.
*>>CONTROL 5<ENTER>
*>>CONTROL 5<ENTER>*>>CONTROL 5<ENTER>
*>>CONTROL 5<ENTER>
Control RB5: PRB 5 3<ENTER>
PRB 5 3<ENTER>PRB 5 3<ENTER>
PRB 5 3<ENTER>
*>>