TDK-Lambda Z+ series User Manual
Programmable DC Power Supplies
200W/400W/600W/800W in 2U
Built-in USB, RS-232 & RS-485 Interface
Series
User Manual
Optional Interface:
IEEE488.2 SCPI (GPIB) Multi-Drop
USER MANUAL FOR
IEEE Programming Interface
POWER SUPPLIES
Manual Supplement
Refer to the Z
+
Technical Manual for information on installing the power supply,
safety requirements, specifications, operating the front panel, using the serial
RS-232/485, USB programming and the analog programming.
IA710-04-03A
Table of Contents
INTRODUCTION ...........................................................................................................3
SCOPE OF MANUAL .....................................................................................................3
CHAPTER 1: THE IEEE-488.2 INTERFACE ....................................................................3
CHAPTER 2: CONNECTION
2.1 Point to Point ...................................................................................................................................... 4
2.2 Multi Drop ............................................................................................................................................ 4
2.2.1 Selecting One Power Supply in a Multi Drop Chain ............................................................................4
2.3 Communication Cables ................................................................................................................... 4
CHAPTER 3: CONFIGURATION
3.1 Configuration the IEEE Controller ................................................................................................ 5
3.2 Configuration the Power Supply ................................................................................................. 5
3.2.1 To Select the Communication Interface .....................................................................................................5
3.2.2 To Select the Address .............................................................................................................................................6
3.2.3 To Select the Baud Rate 57600. (485 Interface only) ............................................................................6
3.2.4 To Select the Communication Language SCPI. (485 interface only) .........................................6
CHAPTER 4: PROGRAMMING COMMANDS
4.1 SCPI Protocol ...................................................................................................................................... 7
4.2 SCPI Common Commands ............................................................................................................. 7
4.3 SCPI Subsystem Commands .......................................................................................................... 8
4.4 Register Structure............................................................................................................................. 12
4.5 The Summary Registers ................................................................................................................. 12
4.6 Output Queue ................................................................................................................................... 12
4.7 Error Messages .................................................................................................................................. 12
4.8 Execution Time ................................................................................................................................. 12
CHAPTER 5: COMMUNICATION EXAMPLE ................................................................15
3
INTRODUCTION
The internal factory installed General Purpose Interface Bus (GPIB) allows operation of the Z+ Power
Supply from a computer via IEEE-488.
The interface allows the user complete remote control of the Power Supply, including output
voltage and current setting and monitoring, protection setting, trigger, waveform list operation,
Power Supply status and SRQ reporting.
Communication over the GPIB interface meets IEEE 488.2 standards for Programmable Instrumentation
(SCPI) compliant.
SCOPE OF MANUAL
This manual contains the information needed to operate the optional embedded IEEE(GPIB)
Interface used in the Power Supply. It includes the following:
• A general description of the GPIB.
• Connection.
• Configuration.
• Listing and description of SCPI command.
• Communication Example.
CHAPTER 1: THE IEEE-488.2 INTERFACE
The IEEE-488 digital programming interface (also called the GPIB interface) is a popular way to
connect instruments to a computer. It uses a specialized 24-pin cable with connectors that allow
cables to be ‘stacked’ together. There are eight data wires; eight control wires and eight ground
wires. If the system runs from a personal computer, there are numerous vendors of IEEE controller
cards and software.
The IEEE-488 standard has gone through several upgrades. The IEEE-488.1 focused on the
handshaking of the eight control lines. The IEEE-488.2 added status registers inside each instrument
and it added common commands to make programming groups of instruments easier. The latest
specification, SCPI, adds guidelines for the command syntax so one vendor’s Power Supply will
use the same commands as another’s. The Interface follows all of these standards.
Because many instruments may be connected and independently controlled by a single IEEE
controller, each instrument must have a unique address. The IEEE controller automatically sets
its address equal to the Power Supply address.
For complete and specific information, refer to the following documents: ANSI/IEEE Std 488.1-1987
IEEE Standard Digital Interface for Programmable Instrumentation and ANSI/IEEE Std 488.2-1987
IEEE Standard Codes, Formats, Protocols and Common Commands.
4
CHAPTER 2: CONNECTION
This section provides information on variable IEEE (GPIB) connection modes, communication
cables and selecting communication parameters for operation via IEEE (GPIB) interface.
It is possible connect to IEEE (GPIB) interface in two ways.
2.1 Point to Point
One IEEE Interface can control only one Z+ Power Supply. Refer to Fig.2-1. Each Power Supply must
be configured for IEEE communication interface. Each unit must have a unique address, ranging
from 01 to 31. Baud rate and address are automatically fixed to “57600" and "SCPI".
2.2 Multi Drop
One IEEE Interface can control more than one Z+ Power Supply. A maximum of 30 Z+ units can be
connected via RS485 interface to a Power Supply with the installed IEEE option. Refer to Fig.2-2.The
Power Supply connected to a PC via the GPIB cable must be configured for an IEEE communication
interface, the other must be configured for a RS485 interface. Each unit must have a unique address,
ranging from 01 to 31. IEEE module gets the address of the unit into which it is installed. For RS485
interface set Baud rate at “57600" bps and Communication Language to "SCPI".
2.2.1 Selecting One Power Supply in a Multi Drop Chain
All the SCPI commands may be sent to any one of the Power Supplies in an RS-485 chain by first
sending the INST:nSEL address command. All commands and queries will then apply only to
the selected Power Supply, until a new INST:nSEL is sent.
At power-up, the IEEE master Power Supply is automatically the one selected.
After sending INST:nSEL, it is recommended that you verify the command by sending INST:nSEL?,
otherwise the following commands may be sent to the wrong Power Supply.
Fig.2-1: Point To Point Connection Fig.2-2: Multi Drop Connection
2.3 Communication Cables
• GPIB cable - Use standard IEEE-488, 26 AWG GPIB cable up to 3 meters in length.
• RS485 link cable - Use serial link cable with RJ-45 shielded connectors (P/N: GEN/RJ45). Refer
to Z+ Series User Manual Fig.7-8.
5
CHAPTER 3: CONFIGURATION
3.1 Configuration the IEEE Controller
A typical IEEE controller is a personal computer with an IEEE interface card. Each card vendor
supplies its own configuration instructions and interface software.
Each time the software is executed, the controller is configured as follows:
• Controller Address = Power Supply address.
• Serial bus Baud Rate = 57600
• SCPI protocol.
• EOI Flag = TRUE. The “End or Identify” is a control line in the IEEE cable that is initiated when
the last character of a message string is sent. It is not supported by this interface.
• EOS Flag = FALSE: The “End of String”, used in some instruments to indicate the last character
of a message. It is required for this interface.
Fig.3-1: Front Panel Fig.3-2: Rear Panel
1. AC ON/OFF Switch
2. REM LED/Buttom
3. Voltage Encoder
4. Voltage Display
5. Current Encoder
6. Current Display
7. RS-232/RS-485 INPUT Remote Serial Programming
8. RS-485 OUTPUT to other Z+ Power Supplies
3.2 Configuration the Power Supply
Refer to Fig.3-1.
3.2.1 To Select the Communication Interface
1. Press REM button. The LED is illuminated. “IN t F " appears on Voltage display.
2. Press Voltage Encoder. Existing communication mode appears on Current display.
3. Turn Current Encoder until desired message appears; "I" (for unit with IEEE option) or "5".
4. To select desired parameter press Current encoder.
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