7.12
SEL-749M Relay Instruction Manual Date Code 20080918
Communications
SEL ASCII Protocol Details
You can also use the ANALOG command to generate a current signal that
increases linearly. Replace the fixed percentage value with an R to ramp the
signal from zero to full scale over time. For example, the command
ANA R 10 instructs the relay to ramp the analog signal from zero to full scale,
reaching full scale in 10 minutes. You can stop the test by pressing any
keyboard character key or the space bar.
BNAMES Command
The BNA command produces ASCII names of all relay status bits reported in
the Fast Meter Data Block (A5D1) message in Compressed ASCII format.
CASCII Command
The CAS command produces the Compressed ASCII configuration message.
This configuration instructs an external computer on the method for extracting
data from other Compressed ASCII commands.
Upon receiving the CAS command, the relay responds with the configurations
of all Compressed ASCII commands: CEV, CHI, CST, and CSU. The
configuration message for only the CHI command is shown below as an
example:
= CAS"CAS",4,"yyyy"<CR>
"CHI",1,"yyyy"<CR>
"1H","FID","yyyy"<CR>
"1D","45S","yyyy"<CR>
"11H","REC_NUM","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","EVENT","CURR","TARG
ETS","yyyy"<CR>
"30D","I","I","I","I","I","I","I","I","16S","F","8S","yyyy"<CR>
Format fields are of the following types:
Table 7.9 BNAMES Command
Command Description Access Level
BNA Display ASCII names of all relay status bits. 0
Table 7.10 CASCII Command
Command Description Access Level
CAS Return the Compressed ASCII
configuration message.
0
where:
yyyy is the 4-byte hex ASCII representation of the checksum
#H represents a header line to precede one or more data lines
with # number of subsequent ASCII names
#D represents a data format line corresponding to maximum
# number of subsequent data lines
I Integer data
mS String of maximum m characters
Courtesy of NationalSwitchgear.com
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