User manual

US 8,510,424 B2
15
The Attention String is sent to break from online mode to
command mode if a modem is connected. The attention string
can be set on most modems to match the @@@ string used by
the power manager.
The Hang-up String is sent to cause the modem to hang up
if there is an active connection.
Initialization String 1 is sent to alter the modem and to
allow the modem time to prepare for the next command.
Initialization String 2 is sent to initialize the modem to
defaults required by the power manager. The “E0” turns off
the echoing of data, the “Q1” turns off result codes and the
“S0:3” sets the modem to answer on the 3’“ ring.
Initialization String 3 is sent to set the modem to answer on
the 1“ ring. The modem initialization features allow a choice
for the modem to answer on either ring number 1 or ring
number 3. The Initialization String 3 is “AT S0:1<CR>”.
Like the other initialization strings, Initialization String 3
defaults to being enabled, and is sent in sequence after Ini
tialization String 2. When this happens the modem answers
on ring number 1. To have the modem instead answer on ring
number 3, disable Initialization String 3 with the command
“SET MODEM INIT3 NONE”.
For most modems, Initialization String 1 or 2 being sent by
the power manager to the modem at one of the supported data
rates is all that is needed for the modem to work with the
power manager. This is because most modems will commu
nicate to the attached serial device (in this case, the power
manager) at the data rate of the lastAT command that was sent
to it. A modem that operates in this manner is operating in
?xed data rate mode. Since the power manager sends the last
AT command at one of its supported data rates, the modem
will talk back to the power manager at that same data rate
when it is on-line with another modem.
Some high-speed modems, however, can be con?gured to
operate in variable data rate mode. With a modem set to
operate in variable data rate mode, when the modems con
nect, the modem may change from the speed of the last AT
command to a different data rate, automatically adjusting to a
data rate that is best for the actual modem-to-modem connect
speed. If the data rate changes to one of the supported data
rates, then the power manager Commander will be able to
communicate. But, if the data rate changes to a non- supported
data rate, such as 14400, 28800, or faster than 38400 BPS, the
power manager Commander will not be able to communicate.
Thus, it is best that the modem be con?gured to operate in
?xed data rate mode, NOT variable data rate mode.
Con?guring the modem to operate in ?xed data rate mode
is not addressed by the modem initialization built into the
power manager Commander because the command that sets
the modem to use ?xed data rate mode varies signi?cantly
with different modem manufacturers.
If the modems are able to connect with each other, but there
is not communication with the power manager Commander,
the modem attached to the power manager is probably in
variable data rate mode and has switched to an unsupported
speed. In this case, in the modem’s manual, lookup the appro
priate AT command(s) for the modem to operate in ?xed data
rate mode. Then attach the modem to a PC with a terminal
program, send the command(s) to the modem, followed by an
&W to write the new setting to the modem’s memory and
make it the default, and then re-attach the modem to the power
manager.
“SET PANEL {NONEIDEFAULT}” changes the opera
tional behavior of the front panel pushbuttons. NONE dis
ables the pushbuttons. DEFAULT sets the front-panel push
buttons to cycle through 2-states (ON and OFF) for non
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Shutdown ports, and three states (ON, Shutdown, and OFF)
for Shutdown ports. This is the default operating mode from
the factory.
The “DEFAULT” option supports locking a port in the on
or off state by pressing and holding the port’s pushbutton for
two seconds, at which point the LED above will ?icker rap
idly. If the port is on, this action will lock the port on. If the
port is off, this action will lock the port off. To unlock a port,
again press and hold the port’ s pushbutton for two seconds is
a the port will stay in the same on or off state, it will be
unlocked again.
When a port is locked, the power state of the port can not be
changed remotely by a user. A user logged in with the “admn”
usemame, however, can lock or unlock a port remotely from
the Power Control Screen by positioning the cursor in the
column of the target port, and then pressing “L” to lock or “U”
to unlock the port.
Regarding “SET PASSWORD [usemame]”, the SET
PASSWORD command is used to change the password of any
usemame. A user may specify a usemame for which the
password is to be changed as a parameter to the SET PASS
WORD command or he may enter the SET PASSWORD
command with no parameters. If a user enters the SET PASS
WORD command without specifying a username, the system
will prompt a user for a usemame with the following prompt:
“Usemame:”. If a valid username is not speci?ed either as a
parameter on the SET PASSWORD command or in response
to the “Usemame:” prompt, the following message is dis
played: “Sorry, a username a user has entered is NOT valid!”,
and the SET PASSWORD command is terminated. If a user
enters a valid usemame he is prompted for the new password
and also for a veri?cation of the new password. A user must
specify the current password in order to change the password
for the administrator usemame (e.g., admn). For all other
usemames the password is changed without having to ?rst
specify the existing password. The password can not contain
more than 16 characters or the command is aborted with the
following message: “Sorry, the password a user has entered is
NOT valid!”. The following message is displayed when the
password is changed: “Password successfully changed”.
The power manager will echo the “*” character for all
characters entered by a user for passwords when using the
SET PASSWORD command. This includes the new pass
word, the veri?cation of the new password and the veri?ca
tion of the existing password in the case of changing the
ADMN password.
Regarding “SET SHOW [username] [ONIOFF]”, the SET
SHOW command is used to enable or disable SHOW com
mand access for a usemame. The SET SHOW command can
be entered with no parameters, with a single parameter
(which is a usemame) or with two parameters (which are
usemame followed by “on” or “off” to indicate the SHOW
command is to be enabled or disabled). If a parameter is not
speci?ed, a user is prompted ?rst for a user name with the
“Usemame:” message followed by a prompt for the “on” or
“off” speci?cation with the “Specify ON or OFF:” message.
If a user does not specify a valid username in response to the
“Usemame:” prompt, the command aborts with the following
message: “Sorry, a usemame a user has entered is NOT
valid!”. If a user enters a single parameter, the “Specify ON or
OFF:” prompt occurs. If a user speci?es both a username and
“on”/“off” parameters there is no prompting. The appropriate
error message is issued and the command aborted if a user
name is invalid, regardless if the “on”/ “off ’ value is speci?ed
as a parameter on the command line or is entered in response
to a prompt. If the command completes successfully, the
following message is displayed: “Show command enabled/