M9B-HFS INTERFACE
M9B-HFS OPERATION
Release 1.0 (97/10)
3-3
3.1.3
Command Strings
If you send more than one command line, separate the commands with a semicolon. The semicolon may be
preceded or followed by spaces.
Example:
ISET 2.0A; VSET 5V
ISET 2.0A ; VSET 5V
3.1.4
Command Terminators
Terminators indicate the end of a command string and tell the power supply to execute the command. The
termination character is CR (Carriage Return).
Format:
COMMAND <parameter>; COMMAND <parameter> , <parameter><CR>
Most computer controllers automatically send CR with output statements.
3.1.5
Order
You may send commands in any order, keeping in mind that only those commands received after a HOLD and
before a TRG (trigger) will be released by the TRG command. In addition, only these commands received after a
supply disable and before a RST (reset) or OUT ON command will be released by the RST command or the OUT
command. Commands are executed in the order they are received.
3.2 Command Summary
Table 3.2-1 to Table 3.2-4 list the commands that control the operation of the power supply. The four command
function types are programming, query, calibration, and status. See Section 3.3 Command Reference for more
detailed information about each command and its use.
Table 3.2-1 Programming Commands
Command
Description
AUXA
Selects the state of the AUXA output signal on the J7-7 connector.
AUXB
Selects the state of the AUXB output signal on the J7-8 connector.
CLR
Initializes the power supply to its Power ON (PON) state.
DLY
Sets a programmable time delay which is executed by the supply before reporting
fault conditions after a new output voltage or current is specified.
FOLD
Sets foldback mode for the supply.
GTL
Sends the supply to local mode.
HOLD
Enables or disables voltage/current setting hold mode for the supply.
IMAX
Sets an upper soft limit on the programmed output current for the supply.
ISET
Sets the output current of the supply in amps (default) or in milliamps.
LLO
Local lockout. Disables the front panel LOCAL button.
OUT
Enables or disables voltage/current output for the supply.
OVSET
Sets the over voltage protection trip point for the supply in volts (default) or in
millivolts.
REN
Enables or disables remote mode.
RST
Resets the supply to present voltage and current settings if the output is disabled
by OVP or foldback protection.
TRG
Implements programmed voltage and current settings which had been in hold
mode.
VMAX
Sets an upper soft limit on the supply’s programmed output voltage.
VSET
Sets the output voltage of the power supply in volts (default) or in millivolts.