INSPECTION AND CONFIGURATION
M9B-HFS INTERFACE
2-6
Release 1.0 (97/10)
2.5 Power ON Conditions
2.5.1
Default Conditions
The M9B-HFS Interface is configured to operate in remote mode when powered on. The default command setting
Remote Enable (REN) ON enables remote digital control of the supply. With REN ON, the supply will respond to
any command you send from the computer.
To select local mode, either press the front panel LOCAL button or send the Go To Local (
GTL)
command from
the computer. The power supply will return to remote mode if a programming command is sent to it from the
computer.
The default power ON settings are shown in Table 2.5-1. You can change these settings using the software
commands shown in Section
3.3.
Table 2.5-1 Remote Mode Power On Default Settings
Condition
Default
Software Command Setting
Remote Enable
ON
REN ON
Voltage
0 Volts
VSET 0
Current
0 Amps
ISET 0
Soft Voltage Limit
VMAX (see models)
VMAX (supply's voltage limit)
Soft Current Limit
IMAX (see models)
IMAX (supply's current limit)
OVP Trip Voltage
Model VMAX + 10%
OVSET (voltage limit + 10%)
Delay
0.5 seconds
DLY 0.5S
Foldback Protection
OFF
FOLD OFF
Output
ON
OUT ON
Hold
OFF
HOLD OFF
Unmask
NONE
UNMASK NONE
AUXA
OFF
AUXA OFF
AUXB
OFF
AUXB OFF
2.5.2
Remote Enable (REN)
The remote enable command REN controls the remote mode switching of the power supply. The default setting
is REN ON. REN ON enables remote digital mode, returning the power supply to remote digital control whenever
a command is sent from the computer. REN OFF disables remote digital operation. When set at REN OFF, power
supply control is at the front panel or at the back panel J2 connector. To check the state of remote enable, use
the REN? query command.
Table 2.5-2 Remote Enable (REN) Command
Condition
Power Supply Control
REN OFF
Local control only
REN ON
Responds to software commands
2.5.3
Local Lockout (LLO)
The local lockout (LLO) command disables the front panel LOCAL button. With LLO in effect, you cannot return
to local control using the front panel LOCAL button. To return to local mode, use the GTL command. The
command REN OFF turns off the LLO condition and returns the power supply to local mode.
