BK Precision BK Precision 9129B Quickstart
Model 9129B
Triple Output Programmable DC Power Supply
Programming Manual
Test Equipment Depot - 800.517.8431 - 99 Washin
TestEquipmentDepot.com
gton Street Melrose, MA 02176
TABLE OF CONTENTS
1 Remote Operation ........................................................................................ 4
1.1 Interface Connection ........................................................................................................ 4
Communication cables ................................................................................................................ 4
USB to TTL Adapter IT-E132B .................................................................................................. 4
RS-232 Settings ........................................................................................................................... 5
2 Remote Commands ...................................................................................... 6
2.1 Parameter Definition ........................................................................................................ 6
2.2 IEEE488.2 Common Commands ....................................................................................... 6
2.3 SCPI STATUS REGISTER ...................................................................................................... 9
2.4 SYSTem Subsystem ......................................................................................................... 14
2.5 OUTPut Subsystem ......................................................................................................... 16
2.6 SOURce Subsystem ......................................................................................................... 17
2.7 MEASure Subsystem ....................................................................................................... 20
2.8 INSTrument Subsystem .................................................................................................. 21
1 Remote Operation
Do not connect the DB9 connector to a standard RS-232 serial port.
Doing so may damage the instrument. The instrument outputs TTL
signal levels only, and must be used with IT-E132B adapter to
connect to a USB port (virtual com) on a PC.
Note: The RMT indicator will appear on display when the power supply is successfully
connected to a PC remotely through any remote interface. Keys on the front panel will be
locked until the instrument is in LOCAL mode. To return to LOCAL mode from the front
panel, press the key. The RMT indicator will disappear when the instrument is in
LOCAL mode.
1.1 Interface Connection
Users can program the power supply by using the SCPI (Standard Commands for Programmable
Instruments) commands over the TTL remote interface (via USB virtual com with IT-E132B).
Communication cables
The power supply has a DB9 connector on the rear panel that allows remote communication via
the IT-E132B adapter.
USB to TTL Adapter IT-E132B
Use the IT-E132B USB to TTL adapter to connect a PC to the instrument for remote
communication.
Connect the INSTRUMENT side of the adapter to the DC load DB9 connector. Connect the
COMPUTER end to a USB port on your computer.
When connected, the computer will automatically install the appropriate drivers (For Windows®
7 or above). The driver is also available for download at www.bkprecision.com .
Upon successful installation of the driver, the USB connection will be registered as a virtual COM
device. It can be accessed and control via the assigned COM port (This can be verified in
“Device Manager”) the same way as you would with RS-232 serial interfaces.
RS-232 Settings
Note: The remote interface does not have a flow control mechanism. The programmer
should be aware of this limitation and allow sufficient command process time. If the
remote commands are sent too fast the power supply’s internal buffer may overrun and
cause a communication error. Therefore, adding a delay between commands to allow for
sufficient time to process commands is required.
In order for the computer to communicate with the power supply, both must be set to the same
RS-232 settings. These communication settings are:
- Baud rate must be one of 4800, 9600, or 38400
- 8 data bits
- One stop bit
- No parity
Refer to the Error! Reference source not found. section in the Menu in the USER MANUAL for
instructions on how to select a different baud rate.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
2 Remote Commands
Symbol
Response Formats
<bool>
Boolean value, can be 1 or “ON”, 0 or “OFF”
<NR1>
Integer value, can be zero, positive or negative
integer number
<NRf>
Flexible numerical value, can be zero, positive or
negative float point numeric value
<string>
String value, characters enclosed in single or double
<LF>
New line, hex code 0x0Ah
<CR>
Carriage return, hex code 0x0Dh
2.1 Parameter Definition
The 9129B Power Supply supports the standard SCPI commands and a few proprietary
commands that follow the SCPI convention. The SCPI interface of the 9129B Power Supply
enables users to operate using a computer or a terminal equipped with RS-232. SCPI IEEE-488.2
also supports multi-unit control allowing a user to control up to 32 power supplies.
The following table lists all of the numerical parameters.
All commands should be terminated with the <LF> or <CR> and there should be a space
between command and numerical parameter <s>.
2.2 IEEE488.2 Common Commands
Below is a list and description of all common SCPI commands supported by the instrument.
*CLS
This command clears the following registers:
Standard event register
Query event register
Operation event register
Status byte register
Error code
Command syntax: *CLS
Parameter: None
*ESE
This command can set the parameter of the standard event enable register. Setting parameter
can determine which bit of standard event register is 1, and the byte will enable ESB of status
byte register as 1.
Bit
Position
7 6 5 4 3 2 1
0
Bit Name
PON
Not
used
CME
EXE
DDE
QYE
Not
used
OPC
Bit Weight
128
32
16 8 4
1
Command syntax: *ESE <NR1>
Parameter: 0~255
The value when power on: Refer to *PSC command
Example: *ESE 128
Query syntax: *ESE?
Returned parameter: <NR1>
The bit definition of the standard event enabled register:
PON Power-on
CME Command error
EXE Execution error
DDE Device-dependent error
QYE Query error
OPC Operation complete
*ESR?
This command can read the value of standard event status register. After executing this
command, standard event status register is reset. Bit definition of standard event status register
is the same as the standard event status enable register.
Query syntax: *ESR?
Parameter: None
Returned parameter: <NR1>
*IDN?
This command can read the power supply information. The returned string contains 4 segments
divided by comma.
Query syntax: *IDN?
Parameter: None
Returned parameter: <AARD> segment description
Manufacturer, Model, Serial number, Software version
Example: B&K Precision, 9205, 602203010697410001, V1.09-V1.04
*OPC
When all commands before this command are executed, bit OPC in standard event register will
be set to 1.
Command syntax: *OPC
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