KEPCO MBT Series - Manual (Page 135)

MBTSVC 111609
B-3
B.7 INSTrument[:SELect] COMMAND
INST:SEL
Syntax: Short Form :INST:SEL Long Form: INSTrument:SELect
Description: Selects power supply connected to channel number ; also brings off-line or “locked
out” power supply to on-line status. selects the instrument to which subsequent commands will be
addressed until another channel is selected. The following the command is the channel
(node) number, from 1 to 31. This command is also used to bring a power supply on-line (i.e., the con-
troller recognizes a power supply assigned to a selected channel). In cases where a fault has “locked
out” a power supply (the controller no longer recognizes the power supply assigned to a channel), this
command restores the power supply to the system. (See example, Figure B-2).)
B.8 INSTrument[:SELect]? QUERY
INST:SEL?
Syntax: Short Form :INST:SEL? Long Form: INSTrument:SELect ?
Return value: 1 to 31
Description: Used to determine which channel selected.
B.9 INSTrument:STATe COMMAND
INST:STAT
Syntax: Short Form :INST:STAT Long Form: INSTrument:STATe
Description: 0 (off) sets output to 0; 1 (on) restores output voltage and current. (see Figure B-2)
FIGURE B-2. IDENTIFYING AND SELECTING DEVICES ON BITBUS
B.10 MEASure[:SCALar]:CURRent[:DC]? QUERY
MEAS:CURR?
Syntax: Short Form: MEAS[:SCAL]:CURR[:DC]?
Long Form: MEASure[:SCALar]:CURRent[:DC]?
= 0 or 1
Return Value: (digits with decimal point and Exponent)
Description: Measures actual current. This query returns the actual value of output current (measured at the out-
put terminals) as determined by the programmed value of voltage and current and load conditions.
NOTE: The SCPI convention for this command allows the controller to establish the range and accu-
racy of the measurement if nn,nn is added after the question mark; the power supply accepts this for-
mat but sets the command warning bit (13) in the status questionable register and ignores the extra
characters. (See example, Figure B-3.)
Note: Power Supply at address 1 is an MBT 25-14, address 2 is an MST 6-12, and address 4 is a BOP 100-1.
*RST Devices are located on the BITBUS (IEEE 1118) as noted above.
INST:SEL 1;*IDN? Controller returns KEPCO,MBT,1,V4.2-3.0 (Channel 1 selected; device con-
nected to BITBUS channel 1 is MBT 25-14, firmware version 3.0; MBT
firmware version is 4.2).
INST:NSEL 2;*IDN? Controller returns KEPCO,MST,2,V4.2-2.6 (Channel 2 selected; device con-
nected to BITBUS channel 2 is MST 6-12, firmware version 2.6; MBT firm-
ware version is 4.2).
VOLT? MAX Controller returns 6.0E0 indicating a 6 volt unit (MST 6-12 at connected to
channel 2).
VOLT4? MAX;:INST:SEL? Controller returns 1.0E2,4 indicating address 4 is selected and the device
connected to BITBUS channel 4 (BOP 100-1) is a 100 volt unit.
*IDN? Controller returns KEPCO,BOP,4,V4.2-1.1 (Device connected to BITBUS
channel 4 is a BOP with BIT card firmware version 1.1; MBT firmware ver-
sion is 4.2).
*RST;*IDN? Controller returns KEPCO,MBT,V4.2-3.0 (Channel 1 selected; device con-
nected to BITBUS channel 1 is MBT 25-14, firmware version 3.0; MBT
firmware version is 4.2).
INST:SEL 3;*IDN? Controller returns KEPCO,PSC,1,V4.2 (Channel 3 selected; unknown
device connected to channel 3; MBT firmware version is 4.2).