7.11
Date Code 20080918 Instruction Manual SEL-749M Relay
Communications
SEL ASCII Protocol Details
If the entered password is incorrect, the relay prompts you for the password
again (
Password: ?). The relay prompts for the password as many as three
times. If the requested password is incorrectly entered three times, the relay
pulses the SALARM Relay Word bit for one second and remains at Access
Level 0 (= prompt).
Access Level Attempt (Password Not Required)
Assume the following conditions
➤ Access Level 1 password is disabled.
➤ Access Level is 0.
At the Access Level 0 prompt, enter the ACC command:
=ACC <Enter>
Because the password is disabled, the relay does not prompt you for a
password and goes directly to Access Level 1. The relay responds with the
following:
[RID Setting] Date: mm/dd/yyyy Time: hh:mm:ss.sss
[TID Setting] Time Source: external
Level 1
=>
The => prompt indicates the relay is now in Access Level 1.
The two previous examples demonstrate going from Access Level 0 to
Access Level 1. The procedure to go from Access Level 1 to Access Level 2
with the 2AC command entered at the access level screen prompt is similar.
The relay pulses the SALARM Relay Word bit for one second after a
successful Level 2 access, or if access is denied.
ANALOG Command
Use the ANALOG p t command to test the relay analog current output.
When you use the ANALOG command, the relay ends normal analog current
output and sends a signal defined by the percentage value, p = 0–100% for
t minutes (t = 1–10 minutes). For example, when the analog output signal type
is 4–20 mA, the command ANA 75 5.5 instructs the relay to output 16 mA
(75% of full scale) for 5.5 minutes or until any character or space key is
pressed to end the test.
Table 7.7 ANALOG Command
Command Description Access Level
ANA p t Test the analog output port. 2
Table 7.8 ANALOG Command Format
Parameter Description
p Parameter p is a percentage of full scale between 0–100% (or either
the letter “R” or “r” to indicate ramp mode).
t Parameter t is time in 1.0–10.0 minutes in decimal minutes.
Courtesy of NationalSwitchgear.com
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