Sorensen DLM 80-50E Programming Manual

DCS, DLM, PRO-T

Series

M9 Option

Programming Manual

SORENSEN Division of Elgar 9250 Brown Deer Road San Diego, CA 92121-2294 1-800-525-2024 Tel: (858) 450-0085 Fax: (858) 458-0267 Email: sales@sorensen.com www.sorensen.com

©2002 by Sorensen, Division of Elgar Electronics Corporation This document contains information proprietary to Sorensen, Elgar Electronics Corporation. The information contained herein is not to be duplicated or transferred in any manner without prior written permission from Sorensen.

June 25, 2002 Document No. M361667-01 Rev G

CONTENTS

SECTION 1 FEATURES, FUNCTIONS, AND SPECIFICATIONS

1.1 Introduction......................................................................................................1-1

1.2 Features and Functions...................................................................................1-1

1.3 Specifications...................................................................................................1-2

SECTION 2 CONFIGURATION

2.1 Setup Procedure..............................................................................................2-1

2.2 Rear Panel Configuration Switch.....................................................................2-2

2.2.1 Remote/Local Selection.......................................................................2-3

2.2.2 Power-On GPIB Service Request (PON SRQ) Selection....................2-4

2.2.3 Master/Auxiliary Selection ...................................................................2-4

2.2.4 Address Selection................................................................................2-4

2.3 External User Control Signal Connector..........................................................2-5

2.4 Remote Programming Via RS-232..................................................................2-7

2.5 Extended Interface Bus (EIB) with the M85 Option.........................................2-8

SECTION 3 IEEE 488.2 AND SCPI COMMAND OPERATION

3.1 Introduction......................................................................................................3-1

3.2 IEEE-488.2 Register Definitions......................................................................3-1

3.2.1 SCPI Status Byte.................................................................................3-1

3.2.2 Standard Event Status Register (ESR)................................................ 3-2

3.2.3 Protection Condition and Protection Event Status Register ................3-3

3.2.4 Operation Status and Questionable Status Registers.........................3-3

3.2.5 Error/Event Queue...............................................................................3-3

3.2.6 Serial Poll Operation............................................................................3-6

3.3 IEEE-488.2 and SCPI Conformance Information ............................................3-6

3.3.1 Parameter Definitions..........................................................................3-6

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Contents Sorensen DCS, DLM, PRO-T Series

3.3.2 Units.....................................................................................................3-7

3.3.3 Conventions.........................................................................................3-7

3.3.4 Queries.................................................................................................3-7

3.4 IEEE-488.2 Common Command Subsystem...................................................3-8

3.5 CALIBRATION SCPI Command Subsystem..................................................3-10

3.5.1 CALIBRATION SCPI Command Summary........................................3-10

3.5.2 CALIBRATION SCPI Command Reference.......................................3-11

3.6 MEASURE SCPI Command Subsystem........................................................3-13

3.6.1 MEASURE SCPI Command Summary..............................................3-13

3.6.2 MEASURE SCPI Command Reference.............................................3-13

3.7 OUTPUT SCPI Command Subsystem...........................................................3-14

3.7.1 OUTPUT SCPI Command Summary.................................................3-14

3.7.2 OUTPUT SCPI Command Reference................................................3-14

3.8 SOURCE SCPI Command Subsystem..........................................................3-15

3.8.1 SOURCE SCPI Command Summary.................................................3-15

3.8.2 SOURCE SCPI Command Reference ...............................................3-16

3.9 STATUS SCPI Command Subsystem ...........................................................3-20

3.9.1 STATUS SCPI Command Summary..................................................3-20

3.9.2 STATUS SCPI Command Reference.................................................3-20

3.10 SYSTEM SCPI Command Subsystem...........................................................3-22

3.10.1 SYSTEM SCPI Command Summary...............................................3-22

3.10.2 SYSTEM SCPI Command Reference..............................................3-22

3.11 TRIGGER SCPI Command Subsystem.........................................................3-24

3.11.1 TRIGGER SCPI Command Summary..............................................3-24

3.11.2 TRIGGER SCPI Command Reference ............................................3-24

3.12 Examples of Using the SCPI Commands ......................................................3-25

SECTION 4 CALIBRATION

4.1 Introduction ......................................................................................................4-1

4.2 Setup for Calibration ........................................................................................4-2

4.3 Voltage Programming Calibration....................................................................4-3

4.4 Voltage Measurement/Readback Calibration...................................................4-4

4.5 Overvoltage Protection Programming Calibration............................................4-5

4.6 Current Programming Calibration ....................................................................4-6

4.7 Current Measurement/Readback Calibration...................................................4-7

4.8 Voltage Programming and Readback Calibration............................................4-8

4.9 Current Programming and Readback Calibration............................................4-9

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Sorensen DCS, DLM, PRO-T Series Contents

SECTION 5 M9A COMMAND OPERATION

5.1 Introduction......................................................................................................5-1

5.2 M9A GPIB Register Definitions........................................................................5-1

5.2.1 Status Byte and the Serial Poll Operation ...........................................5-1

5.2.2 Status, Accumulated Status, Fault, and Mask Registers.....................5-2

5.2.3 Error Register ......................................................................................5-3

5.3 M9A Command Subsystem Reference ...........................................................5-4

5.4 Examples of Using the M9A Commands.......................................................5-10

SECTION 6 OPERATION WITH M85 OPTION

6.1 Introduction......................................................................................................6-1

6.2 Configuration ................................................................................................... 6-1

6.3 System Installation...........................................................................................6-3

6.4 RS-485 Interface..............................................................................................6-4

6.5 Programming the M85 Unit (Example) ............................................................6-4

SECTION 7 SCPI STATUS IMPLEMENTATION

INDEX

M9 Programming Manual

iii

Contents Sorensen DCS, DLM, PRO-T Series

LIST OF FIGURES

Figure 2–1 DCS and Pro-T Configuration Switch.......................................................... 2-2

Figure 2–2 DLM Series 3kW & 4kW Configuration Switch............................................ 2-2

Figure 2–3 DLM Series 600W Configuration Switch..................................................... 2-2

Figure 2–4 External User Connector Designation (8-pin Molex)...................................2-5

Figure 2–5 Example of Open Collector, TTL Input, and Relay Output Circuits.............2-6

Figure 2–6 RS-232 Rear Panel RJ-11 Connector Pinout.............................................. 2-7

Figure 2–7 M9 to PC RS-232 Connection (RJ-11 to DB-9)........................................... 2-7

Figure 2–8 EIB(RS485) Rear Panel RJ-11 Connector Pinout....................................... 2-8

Figure 2–9 M9 to M85 EIB Connection (RJ-11 to RJ-11).............................................. 2-8

Figure 6–1 DCS and Pro-T Configuration Switch, Auxiliary in Remote Mode............... 6-1

Figure 6–2 DLM Series 3kW & 4kW Configuration Switch, Auxiliary in Remote Mode. 6-2

Figure 6–3 DLM Series 600W Configuration Switch, Auxiliary in Remote Mode.......... 6-2

Figure 6–4 RS-485 System Interconnection with Two Auxiliaries.................................6-4

Figure 6–5 M85 Rear Panel RS-485 Connectors Pinout .............................................. 6-4

LIST OF TABLES

Table 6–1 Definitions of S1 Switch Settings ................................................................. 6-3

iv M9 Programming Manual

SECTION 1

FEATURES, FUNCTIONS,

AND SPECIFICATIONS

1.1 Introduction

This manual covers the M9 Remote Programming Option for the DCS, PRO-T, and DLM Series power supplies. The M9 interface card enables you to operate your Sorensen power supply from a computer via the IEEE-488.2 GPIB or RS-232 interface, allowing full remote programming control and monitoring of your power supply.

The M9 is compatible with both the M9A (which it replaces) and SCPI languages. The M9 supports the control of up to 30 auxiliary power supplies from a single GPIB/RS232 interface using the Extended Interface Bus (EIB), which uses RS-485, with the M85 option.

1.2

Features

• 12-bit programming and 12-bit readback of voltage and current

• Programmable overvoltage protection with reset

• IEEE-488.2 and SCPI compliant command set

• User-programmable signals including Local/Remote Sense, External Polarity, and

• User selectable Constant-Voltage/Constant-Current or Foldback mode, with reset

• Voltage Ramp and Current Ramp functions

• Field-upgradable firmware via RS-232

• Attachment of up to 30 supplies via EIB interface with the M85 option

• Soft calibration

• Rear panel IEEE-488.2 and RS-232 control interface

• Rear panel User Control Signal interface

• Rear panel configuration switch

Features and Functions

Disconnect Relay Drive

M9 Programming Manual 1-1

Features and Functions Sorensen DCS, DLM, PRO-T Series

Programmable Functions

• Output voltage and current

• Soft limits for voltage and current

• Overvoltage protection

• Output enable/disable

• Maskable fault interrupt

• Hold and trigger

• External relay control

• Full calibration

Readback Functions

• Actual measured voltage and current

• Voltage and current settings

• Soft voltage and current limits

• Overvoltage protection setting

• Status and Accumulated Status registers

• Programming error codes

• Fault codes

• Manufacturer, power supply model, and firmware version identification

1.3 Specifications

(SUBJECT TO CHANGE WITHOUT NOTICE)

Programming Resolution

Voltage: 0.03% of full scale Current: 0.03% of full scale Overvoltage Protection: 0.03% of full scale (full scale is 110% of max output voltage.)

Programming Accuracy

Voltage: ± (0.1% + 0.1% of maximum output voltage) Current: ± (0.1% + 0.4% of maximum output current)* Overvoltage Protection: ± (0.5% + 0.5% of max output voltage)

Readback Resolution

Voltage: ± 0.03% of full scale Current: ± 0.03% of full scale

Readback Accuracy

Voltage: ± (0.1% + 0.15% of full scale output voltage) Current: ± (0.1% + 0.4% of full scale output current)*

* After 30 minutes operation with fixed line, load, and temperature.

Note: Refer to the power supply manual for effects of line regulation, load regulation, and

temperature on accuracy specifications.

1-2 M9 Programming Manual

SECTION 2

CONFIGURATION

The M9 is installed into the supply at the factory. Use the Setup Procedure described below to configure the M9 for your system and application.

2.1

This procedure is a quick reference for the configuration requirements. Refer to Section 2.2 for detailed information on the rear panel switches.

1. Set the rear panel Remote/Local switch to Remote (On or 1).

2. Set the rear panel Power On Service Request switch to No Service Request (Off or 0).

3. Set the rear panel Master/Auxiliary (M9/M85) to Master (M9) (On or 1).

Setup Procedure

Note: This switch applies only to the DCS and Pro-T Series of power supplies.

It is not used on other models.

4. Set the GPIB/EIB address switches to the desired address. Note: Valid GPIB addresses are 1-30. Valid EIB addresses are 2-31.

5. Connect the GPIB or RS232 Interface Cable to the supply.

6. Connect power to the unit and turn on the unit. Verify that the green REMOTE LED on the front panel is ON.

7. Configure the controller to match the supply identification and configuration. Use one of the available programs such as IBCONF from National Instruments for GPIB, or set the RS232 baud rate to 19200, 8 data bits, no parity, and 1 stop bit.

8. Test the communication interface by issuing a *IDN? Command. This returns the supply’s model and firmware versions and does not affect the output of the supply.

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Configuration Sorensen DCS, DLM, PRO-T Series

2.2 Rear Panel Configuration Switch

The DIP switch is accessible from the rear panel to allow configuration of the supply with the installed M9/M85 for the user’s particular system and application. The following figures show the configuration, as set up in Section 2.1, and with GPIB address set to five (5).

Note: Two types of DIP switches are utilized; toggle and rocker. For toggle switches, the

shading indicates the position of the toggle switch. For rocker switches, the shading indicates the depressed side.

Figure 2–1 DCS and Pro-T Configuration Switch

Figure 2–2 DLM Series 3kW & 4kW Configuration Switch

Figure 2–3 DLM Series 600W Configuration Switch

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Sorensen DCS, DLM, PRO-T Series Configuration

2.2.1 Remote/Local Selection

Set the rear panel Remote/Local switch to select remote or local operation.

REMOTE/LOCAL SWITCH

Switch Position Description

ON Remote operation selected. *

Local operation selected.

OFF

* For DCS firmware prior to version 2.07, and DLM firmware prior to version 1.04 – In the

ON position, the power hardware and GPIB card initialize to the remote state on power turn on. Initially, control is accessible only though GPIB or RS232. Note that control may still revert to front panel control if the appropriate command is sent, or the REN of the GPIB is disabled.

For DCS firmware version 2.07 and above, and DLM firmware version 1.04 and above – In the ON position, the power hardware and GPIB card initialize to the remote state on power turn on. In addition, front panel control remains disabled regardless of the state of the REN line, or the GTL command. The special command SYST[n]:LOCAL <on/off> is now permitted as a means to revert to front panel control if desired.

Powering up in remote mode will result in the following operating conditions.

Front panel control is enabled. Unit will switch to remote operation upon the first GPIB or RS-232 command.

REMOTE MODE POWER-ON CONDITIONS

Condition Default

Voltage 0 Volts (initial power–on voltage). Also see CAL:INIT:VOLT Current 0 Amps (initial power–on current). Also see CAL:INIT:CURR Soft Voltage Limit Model maximum voltage Soft Current Limit Model maximum current

OVP Trip Voltage Delay 0.5 seconds

Foldback Protection OFF Output ON Hold OFF Unmask NONE

Service Request Capability

Model maximum voltage +10% (initial power–on OVP). See CAL:INIT:VOLT:PROT

OFF

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Configuration Sorensen DCS, DLM, PRO-T Series

2.2.2 Power-On GPIB Service Request (PON SRQ) Selection

Set the rear panel PON SRQ switch to ON to cause a GPIB service request to be sent to the computer controller when the supply is turned on. The front panel SRQ LED will also turn on. You may clear the service request and turn off the SRQ LED by issuing a serial poll.

POWER-ON GPIB SERVICE REQUEST (PON SRQ) SWITCH

Switch Position Description

ON Power-On SRQ selected

OFF No Power-On SRQ selected

Refer to your specific GPIB controller card manual for further details on serial polling.

2.2.3 Master/Auxiliary Selection

[Applies to DCS and PROT series only!] For the M9, set the rear panel Master/Auxiliary switch to ON to configure the supply to be the

master. The address selection for a master is the GPIB address (1-30). For the M85, set the Master/Auxiliary switch to OFF to configure the supply to be an auxiliary unit. The address selection for an auxiliary unit is the channel number of that device (2-31). Refer to Section 2.2.4 for more details regarding address selection.

MASTER/AUXILIARY SWITCH

Switch Position Description

ON Master unit (M9 only)

OFF Auxiliary unit (M85 only)

2.2.4 Address Selection

The address selection is binary with switch A0 as the LSB and A4 as the MSB. The rear panel switch illustration in Section 2.2 shows the address selection 00101 in binary (5 decimal).

The address selection for a master unit is the GPIB address of that device (1-30). The address selection for an auxiliary unit is the channel number of that device (2-31). Channel selections 0 and 1 are invalid for an auxiliary device because SCPI reserves channel 0 as the global channel to address all channels and channel 1 as the default master channel to address the master unit.

ADDRESS SWITCHES

Switch Position Description

ON 1

OFF 0

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Sorensen DCS, DLM, PRO-T Series Configuration

2.3 External User Control Signal Connector

An 8-pin Molex or 9-pin Subminiature-D connector located at the rear panel provides external auxiliary control signals to increase the user’s operating control of the supply. The mating receptacle for the 8-pin connector is Molex 43025-0800 with 8 female terminals 43030-0003. The Molex terminals accommodate wire sizes from #20 - #24.

The relay outputs, when active, connect the POLARITY, SENSE, and ISOLATION pins of the connector to the relay COMMON pin. The relays are rated at 120VAC/125VDC @ 1A; for DLM Series 600W, maximum ratings are 60V(PK), 30VA, and 1A.

Any change in output (voltage, current, etc.) initiated by the user from the RS-232 or GPIB interface will cause a 10ms synchronization pulse to be generated at the rear panel User Control Signal Connector of the master unit (Sync Signal).

EXTERNAL USER CONTROL SIGNAL CONNECTOR PINOUT

Sub-D Pin Molex Pin Description

1 1 2 3

3 6

4 7

5 8

6 2 7 5 COMMON for all signals and relay contacts. 8 4 9 — COMMON for all signals and relay contacts.

FOLDBACK output signal, open collector, active-low. Asserted when in foldback mode. FAULT output signal, open collector, active-low. Asserted when a fault is recorded in the fault register. POLARITY output signal, relay contacts. Asserted (contacts close to COMMON) when a negative voltage is programmed. (e.g., SOURce:VOLTage -5.0) ISOLATION output signal, relay contacts. Asserted (contacts close to COMMON) when the output relay is programmed OFF. (e.g., OUTPut:ISOlation OFF) SENSE output signal, relay contacts. Asserted (contacts close to COMMON) when the sense relay is programmed OFF. (e.g., OUTput:SENse OFF) SHUTDOWN TTL input signal, active-high. Allows the user to immediately shutdown the unit by a TTL input signal.

SYNC output signal, open collector, active-low. Pulsed for 10 ms when a change in the output occurs.

Figure 2–4 External User Connector Designation (8-pin Molex)

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Configuration Sorensen DCS, DLM, PRO-T Series

Figure 2–5 Example of Open Collector, TTL Input, and Relay Output Circuits

CAUTION

The relays must not be hot-switched; ensure that the voltage across the relay contacts and the current through them is zero prior to changing the relay states.

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Sorensen DCS, DLM, PRO-T Series Configuration

2.4 Remote Programming Via RS-232

The M9’s RS-232 interface operates at 19.2Kbaud with 8 data bits, no parity, and 1 stop bit. All M9 commands are supported at the RS-232 interface with the exception of the Service Request (SRQ) function which is a GPIB-specific function requiring the dedicated Service Request line of the IEEE-488.2 interface. In this case, the SRQ function has no effect. The RS-232 interface is accessible through the rear panel 6-pin RJ-11 connector; on DLM Series 600W, the connector is labeled RS232(485).

Figure 2–6 RS-232 Rear Panel RJ-11 Connector Pinout

Figure 2–7 M9 to PC RS-232 Connection (RJ-11 to DB-9)

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Configuration Sorensen DCS, DLM, PRO-T Series

2.5 Extended Interface Bus (EIB) with the M85 Option

The M85 option is an auxiliary controller used in conjunction with the M9 to provide multiple sources controlled by a single GPIB address or via a single RS-232 connection. Up to 30 power supplies can be attached to a single M9 via the EIB(RS-485) bus connection at the rear panel of the M9. The EIB(RS-485) is accessible through the rear panel 6-pin RJ-11 connector.

Figure 2–8 EIB(RS485) Rear Panel RJ-11 Connector Pinout

Figure 2–9 M9 to M85 EIB Connection (RJ-11 to RJ-11)

2-8 M9 Programming Manual

SECTION 3

IEEE 488.2 AND SCPI

COMMAND OPERATION

3.1

The following sections describe the operation of the M9 by remote programming using the M9 IEEE-488.2 and SCPI command sets. The M9 IEEE488.2 and SCPI command sets provide programming, query, and status commands that facilitate remote control of the power supply.

3.2

The M9 supports the IEEE-488.2 and SCPI 1995.0 status reporting data structures. These structures are comprised of status registers and status register enable mask pairs. The following sections describe these pairs.

Introduction

IEEE-488.2 Register Definitions

3.2.1

The SCPI Status Byte status register can be read by the *STB? command or by issuing a GPIB serial poll. The Status Byte status register can be cleared by the use of the *CLS command.

The M9 can be configured to request service from the GPIB controller by setting the appropriate bits in the Service Request Enable Register (SRE). The SRE register has the same bit pattern as the Status Byte. It is modified using the *SRE <mask> command and read with the *SRE? command. For example, if the SRE register is set to 0x10 (MAV), when the M9 unit has a message available, the Status Byte register will contain 0x50 (RQS and MAV) and the SRQ line of the GPIB will be asserted to indicate a request for service. See table below, and refer to Section 7 for further information.

SCPI Status Byte

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

SCPI STATUS BYTE

Bit Hex Value Description

0 0x01 1 0x02

2 0x04

3 0x08 4 0x10 5 0x20

6 0x40

7 0x80

Not used. Protection Event Status flag. Indicates the selected protection

event occurred. Error/event queue message available. Set when any error/event is entered in the System Error Queue. It is read using the SYSTem:ERRor? query. Questionable Status flag. Indicates the quality of the current data being acquired. This bit is not used. Message available (MAV). Indicates a message is available in the GPIB output queue. Cleared after the GPIB output buffer is read. Standard Event Status Register (ESR). Summary bit for the ESR. Set when any of the ESR bits are set and cleared when the ESR is read. Request Service flag (RQS) for serial polling or Master Summary Status (MSS) in response to *STB? If service requests are enabled (with the *SRE command), this bit represents the RQS and will be sent in response to a serial poll, then cleared. If RQS is not enabled, the bit represents the MSS bit and indicates the device has at least one reason to request service. Even though the device sends the MSS bit in response to a status query (*STB?), it is not sent in response to a serial poll. It is not considered part of the IEEE-488.1 Status Byte. Operation Status flag. Indicates the current operational state of the unit. This bit is not used.

3.2.2 Standard Event Status Register (ESR)

The Standard Event Status Register (ESR) can be read by the *ESR? command. Reading this register or issuing a *CLS command will clear the ESR. Use the *ESE (Standard Event Status Enable Register) to enable corresponding ESR bits to be summarized in the summary bit of the SCPI Status byte. To configure the M9 to generate GPIB service requests based on the ESR, both the Standard Event Status Enable Register and the Service Request Enable Register must be programmed. See table below, and Section 7 for further information.

STANDARD EVENT STATUS REGISTER

Bit Hex Value Description

0 0x01 Operation Complete 1 0x02 Request Control - not used 2 0x04 Query Error 3 0x08 Device Dependent Error 4 0x10 Execution Error (e.g., range error) 5 0x20 Command Error (e.g., syntax error) 6 0x40 User Request - not used 7 0x80 Power On

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

3.2.3 Protection Condition and Protection Event Status Register

These two registers have the same bit meanings, but they differ in regards to how they function. The Protection Condition Register can be read using the STAT:PROT:COND? command. This

command gives the present status condition of the power hardware, so the data is not latched. It is meant to be used as a polling register.

The Protection Event Status Register can be read by the STATus:PROTection:EVENt? command. Reading this register, issuing a *CLS command, or issuing a *RST command will clear the Protection Event Status Register. Bits in the Protection Event Status Register will be set only when the corresponding bit in the Protection Event Status Enable Register is set and the corresponding event occurs. The status is then latched and will remain in that state until it is read or cleared due to some command action. (Use the STATus:PROTection:ENABle <mask> command to set the Enable Register and the STATus:PROTection:ENABle? query to read the Enable Register.) To configure the M9 to generate GPIB service requests based on the Protection Event Status Register, both the Protection Event Status Enable Register and the Service Request Enable Register (*SRE) must be programmed. For further information, refer to the table below, and to Section 7.

PROTECTION CONDITION AND EVENT STATUS REGISTERS

Bit Hex Value Description

0 0x01 Constant voltage operation 1 0x02 Constant current operation 2 0x04 Not used 3 0x08 Overvoltage protection tripped 4 0x10 Overtemperature protection tripped 5 0x20 Supply external shutdown active 6 0x40 Foldback mode operation 7 0x80 Remote programming error

3.2.4

The Operation Status and Questionable Status Registers will always return 0 when queried. The Operation Status Enable and Questionable Status Enable Registers can be programmed and queried to allow SCPI compatibility but have no effect on the Operation Status and Questionable Status Registers.

3.2.5

Operation Status and Questionable Status Registers

Error/Event Queue

The M9 maintains an Error/Event Queue as defined by SCPI. The queue holds up to 10 error events. It is queried using the SYSTem:ERRor? command which reads in a First In/First Out (FIFO) manner. The read operation removes the entry from the queue. The *CLS command will clear all entries from the queue.

The following error codes are defined in the SCPI 1995.0 specification and are supported by the M9. Error codes are in the range of [-32768, 32767]. SCPI reserves the negative error codes and 0, while error codes greater than 0 are device specific errors.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

SCPI ERROR CODES

Error Code Description

208

207

206

205

204

203

202

201

102

Isolation relay must open first

This means an attempt to change the state of the polarity relay was made while the isolation relay was closed. First open the isolation relay before changing the state of the polarity relay.

Voltage sign mismatched polarity relay state

This means that the algebraic sign on the voltage of a voltage programming command, such as SOUR:VOLT <volt>, did not match the state of the polarity relay, so the voltage command was ignored. For example, if the polarity relay is in the positive voltage position (normal output voltage position), the command SOUR:VOLT –5 will cause this error. Conversely, if the polarity relay is in the negative voltage position (inverted output voltage position), the command SOUR:VOLT 5 will cause this error.

Note that programming Over Voltage Protection with a mismatched algebraic sign also can cause this error.

No channels setup to trigger

This means that an attempt was made to trigger the M9 using the TRIG:TYPE <1|2|3> command when there are no armed trigger settings. This error is not generated when the GET is received, even when there are no armed trigger settings.

GPIB GET not allowed during message

This error means that the GPIB G(roup) E(xecute) T(rigger) multiline command was errantly generated by the system computer while or very shortly after a message is or was sent. Give a few milliseconds after a message was sent before attempting a GET; and never send a GET during the midst of a message transfer over the GPIB.

GPIB IFC caused warm boot

This error relates to the GPIB IFC signal, and is available only in association with a proprietary command.

Hardware watchdog warm boot

This error is caused by a hardware fault either in the power supply proper, or on the M9. One possible explanation might be that the mains power to the supply was interrupted for a short but sufficient time to cause the M9 processor to reset and re-boot. Also, it might be possible to generate this error by a very momentary off action of the front panel power switch.

Foreground watchdog warm boot

This error means that the internal firmware on the M9 found an internal error condition that halted processing; to force resumption of processing, a warm boot was required.

Unexpected warm boot

This error means that the M9 GPIB-side processor experienced a warm boot that was unexpected, and it may indicate an internal crash of the M9 processor.

Incompatible unit type

This error is not used. It cannot occur.

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

101

100

-102

-108

-151

-161

-200

-203

-221

-222

-225

-241

-284

-292

-293

-316

-330

Incompatible unit version

This slave does not support user defined initialization values nor ramping; its firmware is too old a version to do so. Slave #n provides its firmware version number as the last number on the response from the *IDN[n]? query command.

Incompatibility error

This error is not used. It cannot occur. No error

The error queue is empty.

Syntax error

An unrecognized command or data type was encountered.

Parameter not allowed More arguments than expected were received.

Invalid string data

Incorrect password. Manufacturer, model, or serial number string was more than 16 characters. Invalid mnemonic.

Invalid block data The expected number of data values was not received.

Execution error

An error/event number in the range [-299,-200] indicates that an error has been detected by the instruments execution control block. The occurrence of any error in this class shall cause the execution error bit (bit 4) in the Event Status Register to be set. An execution error can be the result of:

• A <program data> element out of range, such as programming 35 volts in a 33 volt device.

• A command could not be executed due to the current condition of the device.

Command protected Attempted to store calibration values to EEPROM without unlocking.

Settings conflict

Attempted to set output greater than soft limits or to set soft limits less than output.

Data out of range Parameter exceeded range of valid values.

Out of memory

There is not enough memory to perform the requested operation. Hardware missing

A legal command or query could not be executed because the option is not installed.

Program currently running A legal command or query could not be executed because a function is currently running.

Referenced name does not exist

Referenced name already exists

Checksum error Self-test failed

A self-test failure has occurred.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

-340

-350

-360

3.2.6

Refer to Section 7 for further information. Performing a serial poll will not modify the Status Byte other than to clear the RQS (bit 6) for an

M9 requesting service. Queries affecting the Status Registers and subsequent serial poll are described below:

• *STB? clears the Status Byte

• *ESR? clears the ESR and bit 5 of the Status Register

• SYSTem:ERRor? clears bit 2 of the Status Register if the queue is empty

Serial Poll Operation

Calibration failed Error during calculation of calibration values occurred.

Queue overflow

The error queue can contain up to 10 entries. If more than 10 error/event conditions are logged before the SYSTem:ERRor? query, an overflow will occur; the last queue entry will be overwritten with error -350. When the queue overflows, the least recent error/events remain in the queue and the most recent error/events are discarded.

Communication error Communications to a channel was disrupted.

3.3

The M9 conforms to most of the specifications for devices as defined in IEEE-488.2 and SCPI Version 1995.0. Confirmed Commands are those commands that are approved commands in the SCPI 1995 Specification, Volume 2: Command Reference. They are denoted by a “C” in the “SCPI” column. Any commands that are not Confirmed Commands are labeled as Not Approved denoted by an “N.”

3.3.1

IEEE-488.2 and SCPI Conformance Information

Parameter Definitions

PARAMETER DEFINITIONS

Type Valid Arguments

<0+NR1> Zero and positive integer numeric values. <-NR1> Negative integer numeric values. <NRf>

<0+NRf> Zero and positive floating point numeric values.

The data format <NR1> is defined in IEEE-488.2 for integers. Zero, positive and negative integer numeric values are valid data.

The data format <NRf> is defined in IEEE-488.2 for flexible Numeric Representation. Zero, positive and negative floating point numeric values are some examples of valid data.

<-NRf> Negative floating point numeric values. <string> Characters enclosed by single or double quotes.

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3.3.2 Units

The Series M9 will accept the following units as suffixes to numeric values:

UNITS

Type of Unit Valid Suffix

Voltage “VOLTS” or “volts”, “V” or “v”, “MV” or “mv” or “mV” Current “AMPS” or “amps”, “A” or “a”, “MA” or “ma” or “mA” Time “SEC” or “sec”, “S” or “s”, “MS” or “ms”, “MIN” or “min” Frequency “HZ” or “hz”

The default units are VOLTS, AMPS, SEC, and HZ. For example, “SOUR:VOLT 1” programs 1 volt. To program in units of millivolts, type “SOUR:VOLT 1mV”.

3.3.3 Conventions

SCPI uses the conventions where optional commands and parameters are enclosed by “[ ]”. Additionally the shorthand version of a command is indicated by capital letters. The optional parameter “[n]” selects the auxiliary channel number (power supply) being commanded. If “[n]” is not specified, the default master channel 1 is automatically selected. Channel 1 selects the master unit and channels 2-31 select an auxiliary unit attached with the M85 option. Selecting the global channel 0 is allowed only for the TRIGgerred[n] commands.

For example, SOURce[n]:VOLTage[:LEVel][:IMMediate][:AMPLitude] 120.0

can be written as SOURce[n]:VOLTage 120.0 // for any channel

or SOUR:VOLT 120.0 // for default master channel 1

3.3.4 Queries

The query syntax is identical to the command syntax with a “?” appended. For example, to query the programmed voltage, send the string: SOURce:VOLTage?. A subsequent device read will return a value such as “33.000”. All queries are terminated with a carriage return and line feed (0x0D 0x0A) for those GPIB controllers that require termination characters. When the M9 has nothing to report, its output buffer will contain two ASCII characters: a carriage return and linefeed (in decimal the values are: <13><10>).

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.4 IEEE-488.2 Common Command Subsystem

The following commands are common to all SCPI instruments and declared mandatory by IEEE-488.2. In the following table, the M9 is defined as the “device” on the GPIB bus.

Command Description *CLS[n] Clears all status reporting data structures including the

Status Byte, Standard Event Status Register, and Error Queue. The STAT:PROT:ENAB (protection event enable register) is cleared by this command; other enable registers are not cleared by this command.

*ESE[n] <0+NR1> Sets the value of the Standard Event Status Enable Register

that determines which bits can be set in the Standard Event Status Register. See section 3.2.2 for valid values.

*ESE[n]? Returns the integer value of the Standard Event Status

Enable Register. See section 3.2.2 for valid values. Response: <0+NR1>

*ESR[n]? Returns the integer value of the Standard Event Status

Response: <0+NR1>

*IDN[n]? Returns the device identification as an ASCII string.

Response: <Manufacturer>, <model>, <serial number>, <DCI firmware version> <AI firmware version>

Example: Sorensen, DCS33-33, B90000-0,

1.00,1.00

*OPC[n] Enables the Operation Complete bit of the Standard Event

Status Register to be set when all pending operations are complete. See section 3.2.2.

*OPC[n]? Returns the integer value “1” when all pending operations

are complete. See section 3.2.2. Response: <0+NR1>

*RST[n] Resets the supply to its Power ON (PON) state.

Clears all status reporting data structures including the Status Byte, Standard Event Status Register, and Error Queue. The STAT:PROT:ENAB (protection event enable register) is cleared by this command; other enable registers are not cleared by this command.

*SRE[n] <0+NR1> Sets the value of the Service Request Enable Register,

which determines which bits in the Status Byte will cause a service request from the device. See section on Status Byte for valid values.

*SRE[n]? Returns the integer value of the Service Request Enable

Response: <0+NR1>

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

Command Description *STB[n]? Returns the integer value of the Status Byte with bit 6

representing the Master Summary Status (MSS) instead of RQS. The MSS bit acts as a summary bit for the Status Byte and indicates whether the device has at least one reason to request service based on the MAV and the ESR bits. The Status Byte is cleared. See section on Status Byte for valid values. Values range from 0-255.

Response: <0+NR1>

*TST[n]? Sets the device to execute an internal self-test and return

the integer value of the results. Value of “0” indicates no errors.

Response: <0+NR1>

*WAI[n] Sets the device to wait until all previous commands and

queries are complete before executing commands following the *WAI command.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.5 CALIBRATION SCPI Command Subsystem

See Section 4 for calibration procedures.

WARNING

Please refer to the power supply manual for further information before performing calibration procedures. Calibration must be performed by qualified personnel who appropriately deal with attendant hazards. If calibration is not performed properly, functional problems could arise, requiring that the supply be returned to the factory.

3.5.1 CALIBRATION SCPI Command Summary

CALibrate[n] :DATA <NRf><NRf><NRf><NRf><NRf><NRf><NRf><NRf><NRf><NRf> :INITial :CURRent <0+NRf> :VOLTage [:AMPLitude] <NRf> :PROTection <NRf> :LOCK :MEASure :CURRent :ADC? :CALCulate :GAIN <NRf> :OFFSet <NRf> :POINt <1|2> <0+NRf> :VOLTage :ADC? :CALCulate :GAIN <NRf> :OFFSet <NRf> :POINt <1|2> <NRf> :OUTPut :CURRent :CALCulate :DAC <0+NR1> :GAIN <NRf> :OFFSet <NRf> :POINt <1|2> <NRf> :VOLTage :CALCulate :DAC <0+NR1> :GAIN <NRf> :OFFSet <NRf> :POINt <1|2> <NRf> :PROTection :CALCulate :DAC <0+NR1> :GAIN <NRf> :OFFSet <NRf> :STORe :UNLock <string>

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

3.5.2 CALIBRATION SCPI Command Reference

Command Description SCPI

CALibrate[n] Calibration subsystem. n = 1-31. The

default channel is 1. :DATA <NRf><NRf><NRf> <NRf><NRf><NRf> <NRf><NRf><NRf> <NRf>

:INITial N :CURRent Sets the power-on default value of current. N :VOLTage N [:AMPLitude] <NRf> Sets the power-on default voltage. N :PROTection <NRf> Sets the power-on default value of the

:LOCK Disables access to the non-volatile memory.

:MEASure N :CURRent :ADC? Returns the integer value of the A/D for the

:CALCulate Calculates the value of the gain and offset :GAIN <NRf> Sets the value of the gain for current :OFFSet <NRf> Sets the value of the offset for current :POINt <1|2> <0+NRf> Sets the current measurement calibration

:VOLTage N :ADC? Returns the integer value of the A/D for the

:CALCulate Calculates the value of the gain and offset :GAIN <NRf> Sets the value of the gain for voltage :OFFSet <NRf> Sets the value of the offset for voltage

Sets the values of the ten floating point

calibration constants:

1) output voltage DAC gain

2) output voltage DAC offset

3) output current DAC gain

4) output current DAC offset

5) output voltage protection DAC gain

6) output voltage protection DAC offset

7) voltage measurement ADC gain

8) voltage measurement ADC offset

9) current measurement ADC gain

10) current measurement ADC offset

Values are separated by space or comma.

overvoltage protection.

Prevents attempts to store calibration

values.

current measurement.

for current measurements.

measurements.

point (1 or 2). The actual output current is

measured with an external meter.

voltage measurement.

for voltage measurements.

measurements.

C N

N N

N N N N N

N N N N

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

Command Description SCPI

:POINt <1|2> <NRf> Sets the voltage measurement calibration

point (1 or 2). The actual output voltage is

measured with an external meter. :OUTPut N :CURRent N :CALCulate Calculates the value of the gain and offset

for output current. :DAC <0+NR1> Sets the output of the output current D/A

converter. The value range is 0 - 4095. :GAIN <NRf> Sets the value of the gain for the output

current. :OFFSet <NRf> Sets the value of the offset for the output

current. :POINt <1|2> <0+NRf> Sets the current output calibration point

(1 or 2). The actual output current is

measured with an external meter. :VOLTage N :CALCulate Calculates the value of the gain and offset

for output voltage. :DAC <0+NR1> Sets the output of the output voltage D/A

converter. The value range is 0 - 4095. :GAIN <NRf> Sets the value of the gain for the output

voltage. :OFFSet <NRf> Sets the value of the offset for the output

voltage. :POINt <1|2> <NRf> Sets the voltage output calibration point

(1 or 2). The actual output voltage is

measured with an external meter. :PROTection N :CALCulate Calculates the value of the gain and offset

for output overvoltage protection. This

takes more than 30 seconds to complete.

Use *ESE 1 and a serial poll to detect the

completed operation. :DAC <0+NR1> Sets the output of the output overvoltage

protection D/A converter. The value range

is 0 - 4095. :GAIN <NRf> Sets the value of the gain for the output

overvoltage protection. :OFFSet <NRf> Sets the value of the offset for the output

overvoltage protection. :STORe Stores the calibration constants in non-

volatile memory. :UNLock <string> Sets the non-volatile memory available to

store calibration constants. The access

string is “6867”.

N N N N N

N N N N

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3.6

3.6.1

MEASure[n] :CURRent? :CURRent :AVErage <value> :AVErage? :VOLTage? : VOLTage :AVErage <value> :AVErage?

3.6.2

Command Description SCPI

MEASure[n] Measure subsystem. n = 1-31. The default channel :CURRent? Returns the floating point value of the DC output :CURRent

:AVErage <value> Enter a value of 1 to 5 to set the number of readings

:AVErage? Returns the number 1 to 5 to indicate the last set

:VOLTage? Returns the floating point value of the DC output : VOLTage

:AVErage <value> Enter a value of 1 to 5 to set the number of readings

:AVErage? Returns the number 1 to 5 to indicate the last set

MEASURE SCPI Command Subsystem

MEASURE SCPI Command Summary

MEASURE SCPI Command Reference

is 1.

current in amps.

— to average together when returning the current value from the MEAS:CURR? command. This function reduces noise in the readback readings. The (default) value of 1 provides the fastest response time, but the noisiest readings. Available for DLM Series firmware versions 1.08 and later.

— number of readings to average together when taking a current reading. Available for DLM Series firmware versions 1.08 and later.

voltage in volts.

— to average together when returning the voltage value from the MEAS:VOLT? command. This function reduces noise in the readback readings. The (default) value of 1 provides the fastest response time, but the noisiest readings. Available for DLM Series firmware versions 1.08 and later.

— number of readings to average together when taking a voltage reading. Available for DLM Series firmware versions 1.08 and later.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.7

3.7.1

OUTPut[n] :ISOLation <boolean> :POLarity <NORM/0/OFF|INV/1/ON> :PROTection :DELay <0+NRf> :FOLD <0|1|2> :SENSe <boolean> :STATe <boolean> :TRIPped?

3.7.2

Command Description SCPI

OUTPut[n] Output subsystem. n = 1-31. The default :ISOLation <boolean> Sets the rear panel isolation relay control

:POLarity <NORM/0/OFF|INV/1/ON> Changes the state of the polarity relay. This

:PROTection N :DELay <0+NRf> Sets the programmable time delay executed

:FOLD <0|1|2> Sets the foldback (program down) mode of

:SENSe <boolean> Sets the sense relay signal open or close. :STATe <boolean> Sets the output to zero or the programmed

:TRIPped? Returns the integer value 1 (TRIPPED) or 0

OUTPUT SCPI Command Subsystem

OUTPUT SCPI Command Summary

OUTPUT SCPI Command Reference

channel is 1.

N signal ON or OFF. Valid arguments are 1/ON or 0/OFF.

command requires that the isolation relay be open beforehand. If the isolation relay is closed when this command is attempted, the state of the polarity relay will not change, and an error message will be generated.

N by the supply before reporting output protection conditions after a new output voltage or current is specified.

N the supply. Valid arguments are 0 (OFF or do nothing, do not program down to zero), 1 (program down to zero upon entering constant-voltage mode), or 2 (program down to zero upon entering constant-current mode).

N Valid arguments are 1/ON or 0/OFF.

C value; opens or closes the isolation relay. Valid arguments are 1/ON or 0/OFF. *RST state value is ON. CAUTION: Ensure that suitable delays are incorporated to preclude hot switching of the isolation relay.

N (UNTRIPPED) state of the output.

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3.8

3.8.1

SOURce[n] :CURRent [:LEVel] [:IMMediate] [:AMPLitude] <0+NRf> :TRIGgered :CLEar [:AMPLitude] <0+NRf> :LIMit [:AMPLitude] <0+NRf> :RAMP <0+NRf> <0+NRf> :ABORt :ALL? :TRIGgered <0+NRf> <0+NRf> :ONLine? :STATus :BLOCk? :REGister? :TIMeout? :VOLTage [:LEVel] [:IMMediate] [:AMPLitude] <NRf> :TRIGgered :CLEar [:AMPLitude] <NRf> :LIMit [:AMPLitude] <NRf> :PROTection [:LEVel] <NRf> :TRIPped? :STATe? :RAMP <NRf> <0+NRf> :ABORt :ALL? :TRIGgered <NRf> <0+NRf>

SOURCE SCPI Command Subsystem

SOURCE SCPI Command Summary

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.8.2 SOURCE SCPI Command Reference

Command Description SCPI

SOURce[n] Source subsystem. n = 1-31. The default

channel is 1.

:CURRent Sets the output current in amps (default) or in

milliamps.

[:LEVel] Sets the output current in amps (default) or in

milliamps.

[:IMMediate] Sets the output current in amps (default) or in

milliamps.

[:AMPLitude] <0+NRf> Sets the output current in amps (default) or in

milliamps.

:TRIGgered Sets the value of the output current to be

implemented by the trigger. :CLEar Clears the trigger mode. [:AMPLitude] <0+NRf> Sets the value of the output current to be

implemented by the trigger. :LIMit Sets an upper soft limit on the programmed

output current for the supply. [:AMPLitude] <0+NRf> Sets an upper soft limit on the programmed

output current for the supply. :RAMP <0+NRf> <0+NRf> Sets the output current to ramp from the present

value to the specified value (first argument) in the

specified time (second argument). See Ramp

Function description below. :ABORt Aborts ramping and clears trigger mode. :ALL? Returns the ramping status of all channels. :TRIGgered <0+NRf> <0+NRf>

:ONLine? Returns the integer value 1(ONLINE) or 0 :STATus

:BLOCk? Returns the block of data critical to the status of

Sets the output current to ramp from the present

value to the specified value (first argument) in the

specified time (second argument) upon the

trigger command. See Ramp description below.

(OFFLINE) of the channel online status.

the channel:

C C C C C C

C C C N

1) channel number

2) online status

3) status flags register (see table below)

4) status register (see sect. 5.2.2)

5) accumulated status (see sect. 5.2.2)

6) fault mask register (see sect. 5.2.2)

7) fault register (see sect. 5.2.2)

8) error register (see sect. 5.2.3)

9) model serial number

10) model voltage

11) model current

12) model over-voltage

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

Command Description SCPI

13) output voltage DAC gain

14) output voltage DAC offset

15) output current DAC gain

16) output current DAC offset

17) output voltage protection DAC gain

18) output voltage protection DAC offset

19) voltage measurement ADC gain

20) voltage measurement ADC offset

21) current measurement ADC gain

22) current measurement ADC offset

23) model string

24) OVP calibrated Each value is separated by commas.

:REGister? Returns the integer value of the status register.

See section 5.2.2.

:TIMeout? Returns the integer value 1 (timeout since last

N query) or 0 (no timeout) of the timeout status of the channel.

:VOLTage Sets the output voltage of the supply in volts

C (default) or in millivolts. *See note on page 3-18.

[:LEVel] Sets the output voltage of the supply in volts

C (default) or in millivolts. *See note on page 3-18.

[:IMMediate] Sets the output voltage of the supply in volts

C (default) or in millivolts. *See note on page 3-18.

[:AMPLitude] <NRf> Sets the output voltage of the supply in volts

C (default) or in millivolts. *See note on page 3-18.

:TRIGgered Sets the value of the output voltage to be

C implemented by the trigger. For DLM Series firmware versions 1.07 and later, the polarity relay must be in the correct position per the algebraic sign of the voltage to be triggered. The state of the polarity relay may be set using the OUTP:POL <

NORM | INV

> command if it is not already in the correct position. Do this before the trigger command is issued.

For DLM Series firmware versions 1.06 and earlier, the algebraic sign of the trigger voltage determines the state of the polarity relay before the voltage is triggered. Therefore, the user load could be exposed to an unintended reverse polarity voltage if the pre-trigger voltage had an opposite algebraic sign from the trigger voltage. For a pre-trigger voltage of zero, the above consideration is not an issue.

:CLEar Clears the trigger mode. [:AMPLitude] <NRf> Sets the value of the output voltage to be

C implemented by the trigger. For DLM Series firmware versions 1.07 and later, the polarity relay must be in the correct position per the al

ebraic sign of the voltage to be triggered. The

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

Command Description SCPI

state of the polarity relay may be set using the OUTP:POL <

NORM | INV

> command if it is not already in the correct position. Do this before the trigger command is issued.

:LIMit Sets the upper soft limit on the programmed

output voltage.

[:AMPLitude] <NRf> Sets the upper soft limit on the programmed

output voltage.

:PROTection Sets the overvoltage protection trip point in volts

(default) or in millivolts.

[:LEVel] <NRf> Sets the overvoltage protection trip point in volts

(default) or in millivolts.

:TRIPped? Returns the integer value 1(TRIPPED) or 0

C (UNTRIPPED) state of the overvoltage protection.

:STATe? Returns the integer value 1 (ON) or 0 (OFF) state

C of the overvoltage protection.

:RAMP <NRf> <0+NRf> Sets the output voltage to ramp from the present

N value to the specified value (first argument) in the specified time (second argument). See Ramp Function description below.

:ABORt Aborts ramping and clears trigger mode. :ALL? Returns the ramping status of all channels. :TRIGgered <NRf> <0+NRf>

Sets the output voltage to ramp from the present value to the specified value (first argument) in the

N specified time (second argument) upon the

trigger command. See description of the Ramp Function below.

*Note: For DLM Series firmware versions 1.07 and later, the algebraic sign of the voltage value

must match the state of the polarity relay, otherwise an error message will be generated, and the voltage command will be ignored. If the voltage value entered is positive, then the polarity relay must be in the NORM state (query the state of the polarity relay using the OUTP:POL? query command). If the voltage value entered is negative, then the polarity relay must be in the INV state. For DLM Series firmware versions 1.06 and earlier, the algebraic sign caused the polarity relay to change automatically to the matching state. This automatic change in the polarity relay state is no longer supported in firmware versions 1.07 and later. To change the state of the polarity relay, use the OUTP:POL <INV | norm> command (when the isolation relay is open). For DCS Series supplies, the polarity relay still automatically follows the algebraic sign.

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THE RAMP FUNCTION

The ramp function allows the user to transition from one voltage or current to another linearly in a specified time period (100 ms - 99 sec with 100 ms programming resolution). The ramp-upontrigger function may be used to program different ramping parameters for several units then trigger them all to begin their ramps at the same time. A unit may ramp only voltage or current, not both at a given time. For example, SOUR:VOLT:RAMP:TRIG 1 1 followed by SOUR:CURR:RAMP:TRIG 2 2 will cause the unit to ramp only the output current to 2 amps in 2 seconds upon the TRIG:RAMP command.

Voltage ramping to a higher voltage requires a programmed current of at least 20% of the full scale value. Settings less than 20% will significantly lengthen the ramp time due to charging of the large capacitance in the output section of the power supply.

Voltage ramping to a lower voltage requires an appropriate resistive load. The discharge rate of the large capacitance in the output section of the power supply, plus other user capacitance, significantly lengthens the ramp time.

Current ramping requires an appropriate resistive load.

Note: On DCS and PRO-T models, the Reading of Voltage or Current during Ramping will

extend Ramp Time.

SOURce[n]:STATus:BLOCK? "Status Flags" REGISTER

Bit Hex Value Name Description

0 0x001 remote mode Remote mode was selected. 1 0x002 polarity signal

2 0x004 PON SRQ 3 0x008 SRQ sent

4 0x010 EEPROM The EEPROM is locked. 5 0x020 trip occurred Either an OV or OT trip occurred. 6 0x040 sense signal Sense relay signal is on. 7 0x080 isolation signal Isolation relay signal is on. 8 0x100 hold Voltage and current output waiting for trigger.

9 0x200 fold Foldback protection is enabled. 10 0x400 SRQ enabled Service Request generation is enabled. 11 0x800 output Output is on.

Negative voltage programmed. Polarity relay signal is on. PON Service Request selected by rear panel switch. GPIB Service Request issued and the serial poll has not been received.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.9

Note: See Section 7 for further information.

3.9.1

STATus[n] :OPERation :CONDition? :ENABle <0+NR1> :EVENt? :PRESet :PROTection :CONDition? :ENABle <0+NR1> :EVENt? :SELEct <0+NR1> :QUEStionable :CONDition? :ENABle <0+NR1> :EVENt?

3.9.2

STATUS SCPI Command Subsystem

STATUS SCPI Command Summary

STATUS SCPI Command Reference

Command Description SCPI

STATus[n] Status subsystem. n = 1-31. The default

channel is 1. :OPERation C :CONDition? Returns the integer value of the Operation

Condition Register. The query is supported

but will always return “0” indicating

operational condition. :ENABle <0+NR1> Sets the enable mask of the Operation Event

reported in the summary bit of the Operation

Condition Register. Values are written and

queried but have no effect on the Operation

Condition Register. :EVENt? Returns the integer value of the Operation

Event Register. This query is supported but

always returns a value of “0” indicating

operational condition. :PRESet Sets the enable mask of the Operation Event

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Command Description SCPI

:PROTection C :CONDition? Returns the integer value of the Protection

Condition Register. Used to read the status of the power hardware. See section 3.2.3 for a detailed table of the various bits that make up this register.

:ENABle <0+NR1> Sets the enable mask of the Protection

Event Register which allows true conditions to be reported in the summary bit of the Protection Condition Register.

:EVENt? Returns the integer value of the Protection

Event Register.

:SELEct <0+NR1> This command provides a means for

selecting which fault bits from the protection event register (also called the fault register and readable using the STAT:PROT:EVEN? command) are able to set the protection event flag bit in the SCPI status byte (readable using the *STB? command). It defaults to value 255 at power-on time, and never changes unless intentionally programmed to a new value. Available in the DLM version of the M9 GPIB option with firmware version 1.05 or later. Not available in the DCS.

:SELEct? Queries the last selection value

programmed. :QUEStionable C :CONDition? Returns the integer value of the

Questionable Condition Register. The query

is supported but will always return “0”

indicating operational condition. :ENABle <0+NR1> Sets the enable mask of the Questionable

Event Register allowing true conditions to be

reported in the summary bit of the

Questionable Condition Register. Values

are written and queried but have no effect on

the Questionable Condition Register. :EVENt? Returns the integer value of the

Questionable Event Register. This query is

supported but always returns a value of “0”,

indicating operational condition.

C N

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

3.10

3.10.1

SYSTem :ERRor? :FAULt? :VERsion? :LOCAL <boolean> :LOCLOUT <boolean>

3.10.2

SYSTEM SCPI Command Subsystem

SYSTEM SCPI Command Summary

SYSTEM SCPI Command Reference

Command Description SCPI

SYSTem System subsystem. C :ERRor? Queries Error Queue for next error/event entry

(first in, first out). Entries contain an error number and descriptive text. A 0 return value indicates no error occurred; negative numbers are reserved by SCPI. The maximum return string length is 255 characters. The queue holds up to 10 error/entries. All entries are cleared by the *CLS command.

:FAULt? Returns four numeric values separated by

commas for the four system fault registers. See System Fault Registers below (e.g., 1, 1, 2, 4 indicates ch 1, 9, 18, and 27 each have at least one fault).

Response: <Fault1–8>, <Fault9–16>, <Fault17–24>, <Fault25–31>

:VERsion? Returns a numeric value corresponding to the

SCPI version number for which the instrument complies. The response is in the format YYYY.V where the Y’s represent the year and V represents the approved version number for that year (e.g., 1995.0)

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

Command Description SCPI

SYST[N]:LOCAL SYST[N]:LOCAL <ON|OFF> is a special

purpose programming command that may be used to cause source [N] to be set to the local state or to the remote state. This command has two noteworthy circumstances under which it may prove necessary. The first case involves using RS232 to communicate with the supply, since the normal GPIB mechanisms for transition between local and remote and back again do not exist when using RS232. The other case is when the REMOTE/LOCAL switch S1-1 is placed in the ON position—thereby disabling the GPIB mechanism for transition from remote to local. The SYST[N]:LOCAL ON command provides a means for the system computer to force source [N] to the local state. Also, the SYST[N]:LOCAL? query command is available to examine the local-remote state of the supply. And the command SYST[N]:LOCAL OFF may be used to force supply [N] to the remote state.

SYST[n]:LOCAL:LOCKOUT The SYST[n]:LOCAL:LOCKOUT <0|1|OFF|ON>

command provides a means of controlling the local lockout functionality that is an alternative to the low level GPIB LLO command. A source number may be specified with this command, thereby allowing selective disabling of the front panel of a selected source.

In contrast, using the GPIB LLO low level command causes the master supply, and all attached online M85 slaves, to be placed into the local lockout state. To place the master and all online M85 slaves into the local lockout state using the SYST[n]:LOCAL:LOCKOUT command, specify the source number of 0.

To place only one slave into the local lockout state, specify that slave in the command. For example, if the slave is source 3, use the command: SYST3:LOCAL:LOCKOUT 1.

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

SYSTEM FAULT REGISTERS

Bit Position Bit Weight Fault1–8 Fault9–16 Fault17–24 Fault25–31

7 128 Channel 8 Channel 16 Channel 24 not used 6 64 Channel 7 Channel 15 Channel 23 Channel 31 5 32 Channel 6 Channel 14 Channel 22 Channel 30 4 16 Channel 5 Channel 13 Channel 21 Channel 29 3 8 Channel 4 Channel 12 Channel 20 Channel 28 2 4 Channel 3 Channel 11 Channel 19 Channel 27 1 2 Channel 2 Channel 10 Channel 18 Channel 26 0 1 Channel 1 Channel 9 Channel 17 Channel 25

The M9 provides four System Fault Registers to allow the user to monitor the fault status of a multiple-channel system. For example, the user may poll these registers to quickly determine which channel generated an enabled GPIB service request.

The SYStem:FAULt? query returns 4 numeric values separated by commas. Each value is the decimal equivalent of the total bit weights for that System Fault Register as described in the table above.

3.11

3.11.1

TRIGger[n] :ABORt :RAMP :TYPE <1|2|3>

TRIGGER SCPI Command Subsystem

TRIGGER SCPI Command Summary

3.11.2 TRIGGER SCPI Command Reference

Command Description SCPI

TRIGger[n] Trigger subsystem. N = 0, 1-31. The default

channel is 1. A value of n = 0 will program all channels.

:ABORt Clears all settings of voltage and current

upon trigger.

:RAMP Implements current or voltage ramping

function previously programmed by the SOURce:CURRent:RAMP or SOURce:VOLTage:RAMP commands.

:TYPe<1|2|3> Implements voltage and current values

previously programmed by the SOURce:CURRent:LEVel:TRIGger and SOURce:VOLTage:LEVel:TRIGger commands. Valid arguments are 1 (Voltage), 2 (Current), or 3 (Both).

N N

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

3.12 Examples of Using the SCPI Commands

The following examples demonstrate programming a power supply to control and to readback the output using the SCPI commands. The maximum voltage and current output is dependent on the particular model. The examples list only the SCPI commands; the code required to send the commands is dependent on the type of language you are using (e.g., C or BASIC) and GPIB hardware (e.g., National Instruments).

EXAMPLE

// Use SYST:ERR? after each command to verify no programming errors. // turn on the unit. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. SOUR:CURR 1.0 // program output current to 1.0 A. SOUR:CURR? // confirm the output current setting (response: 1.0). SOUR:VOLT 5.0 // program output voltage to 5.0 VDC. SOUR:VOLT? // confirm the output voltage setting (response: 5.0). MEAS:CURR? // measure the actual output current (response: ~ 0.0 with no load on

MEAS:VOLT? // measure the actual output voltage (response: ~ 5.0).

EXAMPLE

an overvoltage protection trip condition. (Must use GPIB not RS-232.) // Use SYST:ERR? after each command to verify no programming errors.

// assure that PON is not selected on the rear panel switch // and the front panel SRQ led is OFF. Turn on the unit. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. SOUR:VOLT:PROT 4.0 // program the OVP trip point to 4.0 VDC. SOUR:VOLT:PROT? // confirm the OVP trip point setting (response: 4.0). SOUR:CURR 1.0 // program output current to 1.0 A. SOUR:VOLT 3.0 // program output voltage to 3.0 VDC. STAT:PROT:ENABLE 8 // program the unit to report OVP trip. STAT:PROT:ENABLE? // confirm that OVP fault is enabled (response: 8). *SRE 2 // enable the GPIB service request upon a fault. *SRE? // confirm the GPIB service request enabled (response 2). STAT:PROT:EVENT? // confirm no faults occurred (response: 0). // confirm that the OVP led and SRQ led is not active. SOUR:VOLT 7.0 // program output voltage to 7.0 VDC - cause OVP trip! // confirm that OVP led and SRQ led is active, and unit issued a GPIB service request (use a serial poll).

: Program a unit with no load at the output to 5 VDC @ 1A, and verify the output.

output).

: Program a unit with no load at the output to generate a GPIB service request upon

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

EXAMPLE: Program a unit with no load at the output to change its output voltage and current to 5 VDC @ 1A at the same time.

// Use SYST:ERR? after each command to verify no programming errors. // turn on the unit. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. SOUR:CURR:TRIG1.0 // program output current to 1.0 A upon trigger. SOUR:CURR:TRIG? // confirm output current set to 1.0 A upon trigger. SOUR:VOLT:TRIG5.0 // program output voltage to 5.0 VDC upon trigger SOUR:VOLT:TRIG? // confirm output current set to 5.0 VDC upon trigger. MEAS:CURR? // measure the actual output current (response: 0.0). MEAS:VOLT? // measure the actual output voltage (response: 0.0). TRIG:TYPE 3 // trigger the unit to implement curr and volt programming. MEAS:CURR? // measure the actual output current (response: ~ 0. 0 with no load

on output). MEAS:VOLT? // measure the actual output voltage (response: ~ 5.0). TRIG:ABORT // turn off trigger mode.

EXAMPLE

25 VDC in 30 seconds. Note: The maximum output voltage is dependent upon the power supply rating. // Use SYST:ERR? after each command to verify no programming errors.

// turn on the unit. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. SOUR:CURR 33.0 // program output current to 33.0 A. SOUR:VOLT 5.0 // program output voltage to 5.0 VDC. SOUR:VOLT:RAMP 25.0 30.0 // program voltage to ramp from the present // value (5.0 VDC) to 25.0 VDC in 30 seconds.

EXAMPLE

30 seconds. // Use SYST:ERR? after each command to verify no programming errors.

// turn on with no load at the output. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. // short the output. SOUR:VOLT 33.0 // program output voltage to 33.0 VDC. SOUR:CURR 5.0 // program output current to 5.0 A. SOUR:CURR:RAMP 25.0 30.0 // program current to ramp from the present // value (5.0 A) to 25.0 A in 30 seconds.

: Program a unit with no load at the output to ramp its output voltage from 5 VDC to

: Program a unit with the output shorted to ramp its output current from 5A to 25A in

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Sorensen DCS, DLM, PRO-T Series IEEE 488.2 and SCPI Command Operation

EXAMPLE: Program a unit with no load at the output to ramp its output voltage from 5 VDC to 25 VDC in 30 seconds upon the trigger command.

// Use SYST:ERR? after each command to verify no programming errors. // turn on the unit. *CLS // clear the unit to its power-on default settings. *RST // reset the unit. SOUR:CURR 33.0 // program output current to 33.0 A. SOUR:VOLT 5.0 // program output voltage to 5.0 VDC. SOUR:VOLT:RAMP:TRIG 25.0 30.0 // program voltage to ramp from the present // value (5.0 VDC) to 25.0 VDC in 30 secs. // upon the trigger command. TRIG:RAMP // start ramp execution. TRIG:ABORT // turn off trigger mode.

EXAMPLE

protection level of 3 VDC. Verify proper power-on initialization. // Use SYST:ERR? after each command to verify no programming errors.

// turn on the unit. *CLS // clear the unit to its power on default settings. *RST // reset the unit. CAL:INIT:CURR 1.0 // set power-on initial current to 1.0 A. CAL:INIT:CURR? // confirm power-on initial current setting. CAL:INIT:VOLT 2.0 // set power-on initial voltage to 2.0 VDC. CAL:INIT:VOLT? // confirm power-on initial voltage setting. CAL:INIT:VOLT:PROT 3.0 // set power-on initial overvoltage protection to 3.0 VDC. CAL:INIT:VOLT:PROT? // confirm power-on initial overvoltage protection setting. CAL:UNLOCK “6867” // unlock nonvolatile memory for calibration value storage. CAL:STORE // store the calibration values in nonvolatile memory. CAL:LOCK // lock nonvolatile memory for calibration value protection. // cycle power to the unit. // note voltage is initialized to 2.0 VDC via front panel. SOUR:CURR? // confirm power-on initial current setting. SOUR:VOLT? // confirm power-on initial voltage setting. SOUR:VOLT:PROT? // confirm power-on initial overvoltage protection setting.

: Program a unit to power-on and initialize to 2 VDC @ 1A with an overvoltage

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IEEE 488.2 and SCPI Command Operation Sorensen DCS, DLM, PRO-T Series

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3-28 M9 Programming Manual

SECTION 4

CALIBRATION

WARNING

4.1 Introduction

The M9 is calibrated to adjust internal signal levels to correspond to the expected supply output signal levels. You must perform the calibration procedures if the power supply’s programming or readback performance falls out of specification due to component aging drifts. Refer to your power supply manual to find the required calibration interval. The M9 is calibrated for output voltage programming, output current programming, output overvoltage protection programming, voltage readback, and current readback. There are 10 calibration factors (four measurement and six output).

The calibration procedures in the following sections are designed to be performed at ambient temperature of 25°C + 30 minutes.

The following test equipment is required in addition to the computer system to complete the following calibration:

•

6-digit digital voltmeter (DVM)

•

current shunt rated for 110% of full output current

M9 Programming Manual 4-1

5°C, after the unit has had a stable output and a stable load for at least

Calibration Sorensen DCS, DLM, PRO-T Series

4.2 Setup for Calibration

STEP DESCRIPTION

1. Disconnect the power supply’s AC input power.

2. Disconnect the load from the power supply you want to calibrate.

3. Connect the power supply for sensing at the required load point. Refer to the power supply manual for further information.

4. Connect the DVM to the output for voltage or overvoltage calibration, or connect a current shunt rated for the full output current of the supply and the DVM for current calibration.

5. Assure the correct GPIB primary address has been set by the rear panel switch.

6. Set the power supply to REMOTE mode by the rear panel switch.

7. Connect the GPIB controller to the power supply at the rear panel connector.

8. Reconnect the AC input power. Turn the unit ON and allow the unit to warm up for at least 30 minutes.

9. The unit is ready for all calibration procedures.

WARNING

Exercise caution when using and servicing power supplies. High energy levels can be stored at the output voltage terminals on all power supplies in normal operation. In addition, potentially lethal voltages exist in the power circuit and the output connector on power supplies that are rated at 60V and over. Filter capacitors store potentially dangerous energy for some time after power is removed.

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Sorensen DCS, DLM, PRO-T Series Calibration

4.3 Voltage Programming Calibration

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output current to full scale to prevent Constant-Current operation:

CAL[n]:OUTP:CURR:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 600

4. Let the output settle and measure the voltage with the meter.

5. Enter the actual output voltage corresponding to the DAC value 600 of the first calibration point:

CAL[n]:OUTP:VOLT:POINT 1 <voltage>

6. Program the output of the second calibration point to approximately 85% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 3400

7. Let the output settle and measure the voltage with the meter.

8. Enter the actual output voltage corresponding to the DAC value 3400 of the second calibration point:

CAL[n]:OUTP:VOLT:POINT 2 <voltage>

9. Reset the output voltage to 0 volts.

CAL[n]:OUTP:VOLT:DAC 0

10. Program the M9 to calculate the output voltage calibration gain and offset values:

CAL[n]:OUTP:VOLT:CALC

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

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Calibration Sorensen DCS, DLM, PRO-T Series

13. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

14. The output voltage calibration is complete. The unit may be turned OFF or other calibration procedures may be performed.

4.4 Voltage Measurement/Readback Calibration

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output current to full scale to prevent Constant-Current operation:

CAL[n]:OUTP:CURR:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 600

4. Let the output settle and measure the voltage with the meter.

5. Enter the actual voltage readback corresponding to the DAC value 600 of the first calibration point:

CAL[n]:MEAS:VOLT:POINT 1 <voltage>

6. Program the output of the second calibration point to approximately 85% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 3400

7. Let the output settle and measure the voltage with the meter.

8. Enter the actual voltage readback corresponding to the DAC value 3400 of the second calibration point:

CAL[n]:MEAS:VOLT:POINT 2 <voltage>

9. Reset the output voltage to 0 volts.

CAL[n]:OUTP:VOLT:DAC 0

10. Program the M9 to calculate the voltage readback calibration gain and offset values:

CAL[n]:MEAS:VOLT:CALC

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Sorensen DCS, DLM, PRO-T Series Calibration

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

13. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

14. The voltage readback calibration is complete. The unit may be turned OFF or other calibration procedures may be performed.

4.5 Overvoltage Protection Programming Calibration

The overvoltage protection calibration procedure requires calibrated output voltage programming and voltage readback.

STEP

DESCRIPTION

1. Program the M9 to self-calibrate the overvoltage protection:

CAL[n]:OUTP:VOLT:PROT:CALC

The overvoltage protection calibration function requires over 30 seconds. Use *ESE 1 and serial polls to detect when calibration is done.

2. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

3. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

4. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

5. The output overvoltage protection calibration is complete. The unit may be turned OFF or other calibration procedures may be performed.

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Calibration Sorensen DCS, DLM, PRO-T Series

4.6 Current Programming Calibration

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output voltage to full scale to prevent Constant-Voltage operation:

CAL[n]:OUTP:VOLT:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale current by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 600

4. Let the output settle and measure the current with the current shunt and the meter.

5. Enter the actual output current corresponding to the DAC value 600 of the first calibration point:

CAL[n]:OUTP:CURR:POINT 1 <current>

6. Program the output of the second calibration point to approximately 85% of full scale current by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 3400

7. Let the output settle and measure the current with the current shunt and the meter.

8. Enter the actual output current corresponding to the DAC value 3400 of the second calibration point:

CAL[n]:OUTP:CURR:POINT 2 <current>

9. Reset the output current to 0 amps.

CAL[n]:OUTP:CURR:DAC 0

10. Program the M9 to calculate the output current calibration gain and offset values:

CAL[n]:OUTP:CURR:CALC

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

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Sorensen DCS, DLM, PRO-T Series Calibration

13. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

14. The output current calibration is complete. The unit may be turned OFF or other calibration procedures may be performed.

4.7 Current Measurement/Readback Calibration

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output voltage to full scale to prevent Constant-Voltage operation:

CAL[n]:OUTP:VOLT:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale current

by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 600

4. Let the output settle and measure the current with the current shunt and the meter.

5. Enter the actual current readback corresponding to the DAC value 600 of the first

calibration point:

CAL[n]:MEAS:CURR:POINT 1 <current>

6. Program the output of the second calibration point to approximately 85% of full scale

current by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 3400

7. Let the output settle and measure the current with the current shunt and the meter.

8. Enter the actual current readback corresponding to the DAC value 3400 of the second

calibration point:

CAL[n]:MEAS:CURR:POINT 2 <current>

9. Reset the output current to 0 amps.

CAL:OUTP:CURR:DAC 0

10. Program the M9 to calculate the current readback calibration gain and offset values:

CAL[n]:MEAS:CURR:CALC

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Calibration Sorensen DCS, DLM, PRO-T Series

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

13. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

14. The current readback calibration is complete. The unit may be turned OFF or other calibration procedures may be performed.

4.8 Voltage Programming and Readback Calibration

This procedure may be used to save time if both the output and readback require calibration.

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output current to full scale to prevent Constant-Current operation:

CAL[n]:OUTP:CURR:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 600

4. Let the output settle and measure the voltage with the meter.

5. Enter the actual output voltage corresponding to the DAC value 600 of the first calibration point:

CAL[n]:OUTP:VOLT:POINT 1 <voltage> CAL[n]:MEAS:VOLT:POINT 1 <voltage>

6. Program the output of the second calibration point to approximately 85% of full scale voltage by sending the following command string from the computer:

CAL[n]:OUTP:VOLT:DAC 3400

7. Let the output settle and measure the voltage with the meter.

8. Enter the actual output voltage corresponding to the DAC value 3400 of the second calibration point:

CAL[n]:OUTP:VOLT:POINT 2 <voltage>

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Sorensen DCS, DLM, PRO-T Series Calibration

CAL[n]:MEAS:VOLT:POINT 2 <voltage>

9. Reset the output voltage to 0 volts.

CAL[n]:OUTP:VOLT:DAC 0

10. Program the M9 to calculate the output voltage and the voltage measurement calibration gain and offset values:

CAL[n]:OUTP:VOLT:CALC CAL[n]:MEAS:VOLT:CALC

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

13. Program the M9 to lock the non-volatile memory for calibration value protection.

CAL[n]:LOCK

14. The output voltage and voltage measurement calibrations are completed at the same time. The unit may be turned OFF or other calibration procedures may be performed.

4.9 Current Programming and Readback Calibration

This procedure may be used to save time if both the output and readback require calibration.

STEP

DESCRIPTION

1. Program the overvoltage protection to maximum to prevent nuisance trips:

CAL[n]:OUTP:VOLT:PROT:DAC 4095

2. Program the output voltage to full scale to prevent Constant-Voltage operation:

CAL[n]:OUTP:VOLT:DAC 4095

3. Program the output of the first calibration point to approximately 15% of full scale current by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 600

4. Let the output settle and measure the current with the current shunt and the meter.

5. Enter the actual output current corresponding to the DAC value 600 of the first calibration point:

CAL[n]:OUTP:CURR:POINT 1 <current> CAL[n]:MEAS:CURR:POINT 1 <current>

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Calibration Sorensen DCS, DLM, PRO-T Series

6. Program the output of the second calibration point to approximately 85% of full scale current by sending the following command string from the computer:

CAL[n]:OUTP:CURR:DAC 3400

7. Let the output settle and measure the current with the current shunt and the meter.

8. Enter the actual output current corresponding to the DAC value 3400 of the second calibration point:

CAL[n]:OUTP:CURR:POINT 2 <current> CAL[n]:MEAS:CURR:POINT 2 <current>

9. Reset the output current to 0 amps.

CAL[n]:OUTP:CURR:DAC 0

10. Program the M9 to calculate the output current and current measurement calibration gain and offset values:

CAL[n]:OUTP:CURR:CALC CAL[n]:MEAS:CURR:CALC

11. Program the M9 to unlock the non-volatile memory for calibration value storage:

CAL[n]:UNLOCK “6867”

12. Program the M9 to store the calibration values in non-volatile memory:

CAL[n]:STORE

13. Program the M9 to lock the non-volatile memory for calibration value protection

CAL[n]:LOCK

14. The output current and current measurement calibrations are completed at the same time. The unit may be turned OFF or other calibration procedures may be performed.

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SECTION 5

M9A COMMAND OPERATION

5.1 Introduction

The following sections describe the operation of the M9 by remote programming using the M9A command set. This command set is included for backward compatibility with older products and is not recommended for new programs. See Section 3 for further information.

The M9A command set of programming, query, and status commands allow control of the power supply. Both GPIB and RS-232 are supported with the exception of Service Request (SRQ), which is a GPIB-specific implementation.

5.2 M9A GPIB Register Definitions

5.2.1 Status Byte and the Serial Poll Operation

The supply responds to a GPIB serial poll with the 8-bit Status Byte defined as follows:

STATUS BYTE REGISTER

Bit Position Decimal Weight Description Reset By

7 (MSB) 128

6 64

5 32

4 16

3, 2, 1 8, 4, 2 Not used. —

0 (LSB) 1

Power ON (PON) - Set when the supply initializes at power on. Request Service (SRQ) - Set when the supply requests service. Error (ERR) - Set when the ERR bit is asserted in the Status Register.

Ready - Set when the supply is ready to accept commands.

Fault - Set when any bit in the fault register is set by a fault condition in the supply.

CLR or Device clear.

Serial poll.

ERR? query. Power supply

during command processing period.

FAULT? query.

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M9A Command Operation Sorensen DCS, DLM, PRO-T Series

5.2.2 Status, Accumulated Status, Fault, and Mask Registers

The Status, Accumulated Status, Fault, and Mask Registers share the same bit map. Each register describes an operating condition of the supply. The Status Register describes the current status of the supply. The Accumulated Status Register records the history of the supply status. The Fault Register records the condition that occurred enabled by the Mask Register.

STATUS AND FAULT REGISTERS

Condition Mnemonic Bit Position Bit Weight

Remote programming error ERR 7 128 Foldback mode operation FOLD 6 64 Supply external shutdown active (J7-1) SD 5 32 Overtemperature protection tripped OT 4 16 Overvoltage protection tripped OV 3 8 Not used — 2 4 Constant current operation CC 1 2 Constant voltage operation CV 0 1

Notes:

1. Only CV,CC,OV,OT,SD,ERR, and FOLD can be MASKed or UNMASKed.

2. The error (ERR) bit is reset with an error query (ERR?).

3. The accumulated status register is cleared with an accumulated status query (ASTS?).

4. A fault is cleared with a fault query (FAULT?).

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Sorensen DCS, DLM, PRO-T Series M9A Command Operation

5.2.3 Error Register

ERROR REGISTER

Error # Error Identification Explanation

0 No errors — 1 Unrecognized character A character such as @ or $ was received. 2 Not used — 3 Not used —

4 Syntax error

5 Number out of range

6 Attempt to exceed soft limits

7 Improper soft limit

8 Not used — 9 OVP set below output

An unrecognized command or data type was encountered. (e.g., AAA) A number received for the command was outside of the allowed range. (e.g., VSET 900) An attempt was made to program a voltage or current greater than the soft limit. (e.g., VMAX 500V; VSET 550V) An attempt was made to program a soft limit less than the output value. (e.g., VSET 5; VMAX 3)

An OVSET command was sent with a trip value lower than the output voltage. (e.g., VSET 5; OVSET 3)

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M9A Command Operation Sorensen DCS, DLM, PRO-T Series

5.3 M9A Command Subsystem Reference

CAUTION

Do not intermingle M9A commands with SCPI commands. Doing so will result in unreliable, unmeaningful, and/or incorrect status commands. Use only M9A commands, or only SCPI commands; do not use both together.

The M9A commands provide control in 4 categories:

• ID control

• initialization control

• output control

• status and fault control

ID CONTROL

Commands Description ID? Returns the power supply model and the firmware version as an

ASCII string.

Response: ID <model name> <version> Example: ID DCS33-33 Version 1.00

The ID? query is a safe command to initially verify communications since it does not affect the unit in the other categories.

INITIALIZATION CONTROL

Commands Description CLR Initializes the supply to its Power ON (PON) condition. Resets

the PON bit (position 7) in the Serial Poll Register.

RST Resets the supply to present voltage and current settings if the

output is disabled by overvoltage or foldback protection. Output values may be changed via VSET, ISET, and OVSET while the unit is disabled but will not take effect until RST is used.

Use the Initialization Control commands to clear an over-voltage fault condition or to set the unit to the known safe power-on default settings state.

OUTPUT CONTROL

Commands Description HOLD <boolean> Enables or disables voltage and current setting hold mode.

When HOLD ON is specified, hold mode is enabled so that all voltage and current settings which normally be implemented by the supply are held until a trigger (TRG) command is received. This allows you to synchronize the operation of several supplies.

Initial value: HOLD 0 (OFF)

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Sorensen DCS, DLM, PRO-T Series M9A Command Operation

Commands Description HOLD? Returns the integer value of the present hold mode setting.

Response: HOLD <mode> where mode is: 0 (OFF or disabled) or 1 (ON or enabled)

IOUT? Returns the floating point value of the actual current output

measured using the built-in current readback A/D converter. Response: IOUT <0+NRf>

IMAX <0+NRf> Sets the upper soft limit on the programmed output current. If

the soft limit is exceeded or if the soft limit value is lower than the present output current setting, the supply will ignore the command, turn on the ERR LED, and set the ERR bit in the Status and Serial Poll Registers.

Range: 0 to model maximum output current Initial value: model maximum current

IMAX? Returns the floating point value of the soft current limit setting.

Response: IMAX <0+NRf>

ISET <0+NRf> Sets the output current in amps (default) or in milliamps. This

programmed current is the actual output in CC mode or the current limit in Constant-Voltage mode.

Range: 0 to model maximum output current (IMAX) Initial value: 0 amps

ISET? Returns the floating point value of the present output current

setting. Does not apply to current settings which are being held (see HOLD).

Response: ISET <0+NRf>

OUT <boolean> Enables or disables voltage and current output. The supply will

continue to accept new commands while the output is disabled but these will not be implemented until OUT ON or OUT 1 is received. OUT OFF or OUT 0 also sets the isolation signal on the rear panel J7 connector line 3 which may be used to trip external relays to isolate the supply from the load.

Initial value: OUT 1 (ON or output enabled)

OUT? Returns the integer value of the present enabled/disabled status

of the output voltage and current. Response: OUT <mode> where mode is:

0 (OFF or disabled) or 1 (ON or enabled)

TRG Implements the programmed voltage and current settings which

had been in hold mode. The supply operates with previous values until the trigger (TRG) command is received.

M9 Programming Manual 5-5

M9A Command Operation Sorensen DCS, DLM, PRO-T Series

Commands Description VMAX <NRf> Sets the upper soft limit on the programmed output voltage. If

the soft limit is exceeded or if the soft limit value is lower than the present output voltage setting, the supply will ignore the command, turn on the ERR LED, and set the ERR bit in the Status and Serial Poll Registers.

Range: 0 to model maximum output voltage Initial value: model maximum voltage

VMAX? Returns the floating point value of the soft voltage limit setting.

Response: VMAX <NRf>

VOUT? Returns the floating point value of the actual voltage output

measured using the built-in voltage readback A/D converter. Response: VOUT <NRf>

VSET <NRf> Sets the output voltage in volts (default) or in millivolts. This

programmed voltage is the actual output in CV mode or the voltage limit in Constant-Current mode.

Range: 0 to model maximum output voltage (VMAX) Initial value: 0 volts

VSET? Returns the floating point value of the present output voltage

setting. Does not apply to voltage settings which are being held (see HOLD command).

Response: VSET <NRf>

Use the Output Control commands to set the output conditions of the unit:

• the output may be enabled or disabled,

• the output current and voltage levels may be set and queried,

• the output current and voltage may be measured,

• the output current and voltage change may be synchronized, and

• the output current and voltage level limits may be set and queried.

STATUS AND FAULT CONTROL

Command Description ASTS? Returns the integer value of the Accumulated Status Register.

The Accumulated Status Register stores any bit that was entered in the Status Register since the Accumulated Status query command (ASTS?) was last used (if at all) regardless of whether the condition still exists. The Accumulated Status Register has the same bits, weights, and conditions as the Status Register. A bit in the Accumulated Status Register will be set to 1 if the corresponding bit in the Status Register has been 1 (TRUE) at any time since the register was last read.

Response: ASTS <status mask> where status mask is the decimal equivalent of the total bit weights for the operating conditions as listed in the Status Register.

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Sorensen DCS, DLM, PRO-T Series M9A Command Operation

Command Description DLY <0+NRf> Sets the programmable time delay before reporting fault

conditions after a new output voltage or current is specified (VSET, ISET) or RST,TRG, or OUT ON commands are received. During delay time, the power supply disabled CV, CC, and FOLD conditions from generating faults, preventing possible nuisance foldback or service requests if the supply momentarily switches modes while changing an output setting.

Range: 0 to 32 seconds, with 1 ms resolution. Initial value: 0.5 seconds

DLY? Returns the floating point value of the programmable delay time

setting before reporting fault conditions. Response: DLY <0+NRf>

ERR? Returns the integer value of the most recent remote

programming errors which occurred since the last time the error query (ERR?) was issued. When the supply detects a programming error, it sets the ERR bit in the Status and Fault Registers which can be unmasked (UNMASKed) on the Fault Register to request service. The remaining portion of the command line is discarded. An error query or a new, error-free, command clears the ERR bit in both the Status Register and the Serial Poll Register.

Response: ERR <0+NRf>

FAULT? Returns the integer value of the Fault Register for the fault

condition status. When a bit is set in the Fault Register, the rear panel J7 connector Fault Line 4 is also asserted. The Fault Line from any supply in the system may be tied to the External Shutdown Line J7-1 of all supplies to provide shutdown of the system, independent of the GPIB, for user-defined faults. The FAULT? query clears bits in the supply’s Fault Register and fault lines.

Response: FAULT <fault mask> where fault mask is the decimal equivalent of the total bit weights for the operating conditions as listed in the Fault

FOLD? Returns the integer value of the present foldback mode setting.

Sets the foldback mode. Foldback protection disables the

supply output when the output enters the foldback condition.

Reset with the RST command. For example, specify FOLD CV

or FOLD 1 for the supply to operate in Constant Current mode

and have foldback protection disable the output if the supply

switches to Constant Voltage mode.

Initial value: FOLD 0 (OFF).

Response: FOLD <mode> where mode is:

0 (OFF), or

1 (CV or Constant Voltage mode), or

2 (CC or Constant Current mode)

M9 Programming Manual 5-7

M9A Command Operation Sorensen DCS, DLM, PRO-T Series

Command Description MASK <mnemonics> Disables the specified supply’s operating conditions from

reporting fault conditions in the Fault and Status Registers. Mnemonics are separated from each other by commas, and may be sent in any order.

MASK mnemonics: CV (Constant Voltage), CC (Constant Current) OV (Overvoltage Protection) OT (Over Temperature Protection) SD (Shutdown) FOLD (Foldback) NONE (all conditions enabled) ALL (all conditions disabled)

Initial value: MASK ALL

OVSET <NRf> Sets the overvoltage protection trip point in volts (default) or in

millivolts. Range: 0 to 110% of model maximum output voltage

(VMAX) Initial value: 110% of model maximum voltage

OVSET? Returns the floating point value of the present overvoltage

protection limit. Response: OVSET <0+NRf>

SRQ <boolean> SRQ ON enables/disables the supply to respond to a variety of

fault conditions by generating an IEEE-488 GPIB service request. With SRQ ON, the SRQ line will be asserted true whenever the FAU bit in the Serial Poll Register changes from 0 to 1. Therefore, the mask register, in addition to specifying which conditions set the FAU bit, also determines which conditions can generate service requests. Seven (7) supply conditions are defined as faults: CV, CC, OV, OT, SD, FOLD, and PON. User the FAULT? query to discover which condition caused the service request except for PON. A request for service at Power ON (PON) is set via the rear panel switch on the supply. SRQ remains disabled until the FAU bit in the Serial Poll Register is cleared by a FAULT? query.

Initial value: SRQ 0 (OFF)

SRQ? Returns the integer value of the present enabled/disabled status

to generate GPIB service requests. Response: SRQ <mode> where mode is:

0 (disabled) or 1 (enabled)

5-8 M9 Programming Manual

Sorensen DCS, DLM, PRO-T Series M9A Command Operation

Command Description STS? Returns the integer value of the present Status Register. Status

conditions are stored in the 8-bit Status Register. Each bit

represents a separate condition. When the condition is true, the

corresponding bit is 1. Bits remain set in the Status Register as

long as the condition is true.

Response: STS <status mask> where status mask is the

decimal equivalent of the total bit weights for the

operating conditions as listed in the Status

Enables the specified operating conditions for fault occurrence.

Mnemonics are separated from each other by commas and may

be sent in any order. Specifying one or more mnemonics which

describe the conditions (or the decimal equivalent of their total

bit weight) enables the selected conditions to set bits in the

Fault and Status Registers. A bit is set in the Fault Register

when the corresponding bit in the Status Register changes from

0 to 1 and the corresponding bit the Mask Register is 1.

Whenever any bit is set in the Fault Register, the FAU bit

(position 0 is set in the Serial Poll Register.

UNMASK mnemonics: CV (Constant Voltage),

CC (Constant Current)

OV (Overvoltage Protection)

OT (Over Temperature Protection)

SD (Shutdown)

FOLD (Foldback)

NONE (all conditions disabled)

ALL (all conditions enabled)

Initial value: UNMASK NONE UNMASK? Returns the integer value of the fault conditions currently

enabled (UNMASKed).

Response: UNMASK <fault mask> where fault mask is the

decimal equivalent of the total bit weights for the

operating conditions as listed in the Status and

Fault Registers.

Use Status and Fault Control commands to monitor the operating condition of the unit:

• CV (Constant Voltage operation),

• CC (Constant Current operation),

• OV (Overvoltage Protection tripped),

• OT (Over Temperature Protection tripped),

• SD (Shutdown active),

• FOLD (Foldback mode operation),

• ERR (Remote programming error) The value of the over-voltage trip point may be set and queried. The foldback condition to

monitor may be selected and queried. Enabled fault conditions will generate a GPIB service request if enabled. The most recent programming error may be queried.

M9 Programming Manual 5-9

M9A Command Operation Sorensen DCS, DLM, PRO-T Series

5.4 Examples of Using the M9A Commands

The following examples demonstrate programming control and to readback the output using the M9A commands. The maximum voltage and current output is dependent on the particular model. The examples list only the M9A commands; the code required to send the commands is dependent on the type of language you are using (e.g., C or BASIC) and GPIB hardware (e.g., National Instruments).

EXAMPLE

// Use ERR? after each command to verify no programming errors. // turn on the unit. CLR // clear the unit to its power-on default settings. RST // reset the unit. ISET 1.0 // program output current to 1.0 A. ISET? // confirm the output current setting. (response: ISET 1.000) VSET 5.0 // program output voltage to 5.0 VDC. VSET? // confirm the output voltage setting. (response: VSET 5.000) IOUT? // measure the actual output current (response: IOUT ~0.000 with no load

VOUT? // measure the actual output voltage (response: VOUT ~5.000).

EXAMPLE

an overvoltage protection trip condition. (Must GPIB not RS-232.) // Use ERR? after each command to verify no programming errors.

// assure that PON is not selected in the rear panel switch // and the front panel SRQ led is OFF. Turn on the unit. CLR // clear the unit to its power-on default settings. RST // reset the unit. OVSET 4.0 // program the OVP trip point to 4.0 VDC. OVSET? // confirm the OVP trip point setting (response: OVSET 4.000). ISET 1.0 // program output current to 1.0 A. VSET 3.0 // program output voltage to 3.0 VDC. UNMASK OV // program the unit to report OVP trip. UNMASK? // confirm that OVP fault is enabled (response: UNMASK 8). SRQ 1 // enable the GPIB service request upon a fault. SRQ? // confirm the GPIB service request enabled (response: SRQ 1). FAULT? // confirm no faults occurred (response: FAULT 0). // confirm that the front panel OVP led and SRQ led is not active. VSET 7.0 // program output voltage to 7.0 VDC - cause OVP trip! // confirm that the front panel OVP led and SRQ led is active, and // the unit issued a GPIB service request (use a serial poll).

: Program a unit with no load at the output to 5 VDC @ 1 A, and verify the output.

on output).

: Program a unit with no load at the output to generate a GPIB service request upon

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Sorensen DCS, DLM, PRO-T Series M9A Command Operation

EXAMPLE: Program a unit with no load at the output to change its output voltage and current to 5 VDC @ 1A at the same time.

// Use ERR? after each command to verify no programming errors. // turn on the unit. CLR // clear the unit to its power-on default settings. RST // reset the unit. HOLD 1 // program the unit to hold changes until TRG received. HOLD? // confirm that hold is enabled (response: HOLD 1). ISET 1.0 // program output current to 1.0 A upon TRG. VSET 5.0 // program output voltage to 5.0 VDC upon TRG. IOUT? // measure the actual output current (response: IOUT ~0.000). VOUT? // measure the actual output voltage (response: VOUT ~0.000). TRG // trigger the unit to implement ISET and VSET. IOUT? // measure the actual output current (response: IOUT ~0. 000 with no

load on output). VOUT? // measure the actual output voltage (response: VOUT ~5.000). HOLD 0 // turn off hold mode.

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M9A Command Operation Sorensen DCS, DLM, PRO-T Series

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5-12 M9 Programming Manual

SECTION 6

OPERATION WITH M85 OPTION

6.1 Introduction

The following sections describe the operation of the power supply with the M85 option and how to configure the option for your application.

The M85 option enables you to use your power supply as an auxiliary unit. The master unit would be a power supply with the M9 interface option. Both IEEE-488.2 and RS-232 are supported, and the auxiliary unit or units share the GPIB address or RS-232 interface with the master unit. Up to 30 auxiliary units can be controlled by the master unit.

This option can be used with the 1kW and 3kW supplies and supports the SCPI language. Refer to Section 5, above, for programming information.

6.2 Configuration

The DIP switch S1, represented in Figure 6–1 through Figure 6–3, is accessible from the rear panel. It allows configuration of the M85 for auxiliary operation.

The figures show the settings for the M85 configured as an auxiliary at channel 2, in remote mode, with no SRQ generated upon initialization.

Figure 6–1 DCS and Pro-T Configuration Switch, Auxiliary in Remote Mode

M9 Programming Manual 6-1

Operation With M85 Option Sorensen DCS, DLM, PRO-T Series

Figure 6–2 DLM Series 3kW & 4kW Configuration Switch, Auxiliary in Remote Mode

Figure 6–3 DLM Series 600W Configuration Switch, Auxiliary in Remote Mode

6-2 M9 Programming Manual

Sorensen DCS, DLM, PRO-T Series Operation With M85 Option

See Table 6–1 for definitions of all S1 switch settings:

Table 6–1 Definitions of S1 Switch Settings

Switch ON OFF

S1-1 Remote control Local control S1-2 PON SRQ ON. Generates GPIB

service request to computer/controller when the power supply initializes upon first communication. The front panel SRQ LED will also turn ON. Issuing a serial poll clears service

request and turns OFF LED. S1-3 Not applicable. Must be OFF. Unit operates as an auxiliary unit. S1-4–8 S1-4 S1-5 S1-6 S1-7 S1-8

Set channel number for unit in binary:

Binary 1 ON Binary 2 ON Binary 4 ON Binary 8 ON Binary 16 ON

Disables GPIB service request upon initialization.

(Channels 0 and 1 see note below.)

Binary 1 OFF Binary 2 OFF Binary 4 OFF Binary 8 OFF Binary 16 OFF

Note: Channel numbers 0 and 1 are invalid for any auxiliary device, because the M9

implementation of the SCPI language reserves channel 0 for the “global” address to address all channels, and it reserves channel number 1 as the default number for the master channel.

6.3 System Installation

Follow the steps below, illustrated in Figure 6–4, to install the configured M85 into your system:

1. Configure the M85 as described in the Configuration section above.

2. Connect the master unit’s RS-485 output connector, J2, to the auxiliary unit’s RS-485 input connector, J1, using the modular cable.

3. If there are additional auxiliary units, connect the installed auxiliary unit’s RS-485 output connector, J2, to the additional auxiliary unit’s RS-485 input connector, J1, using the modular cable.

4. Connect the 120 ohm resistive termination assembly to the last auxiliary unit’s J2 connector.

5. Connect power to the system, power it up, and verify that the green REMOTE LED on the front panel is ON.

6. Test the link by communicating with the auxiliary unit from the master unit, using the

*IDN[n]? command. Note that [n] is the channel number—for example, *IDN2? calls channel

2. (In response to this string, the system returns the power supply model number and the firmware version.)

M9 Programming Manual 6-3

Operation With M85 Option Sorensen DCS, DLM, PRO-T Series

Figure 6–4 RS-485 System Interconnection with Two Auxiliaries

6.4 RS-485 Interface

The RS-485 interface is accessible through the two rear-panel, 6-pin, RJ-11 connectors, J1 and J2, depicted in Figure 6–5.

Figure 6–5 M85 Rear Panel RS-485 Connectors Pinout

6.5 Programming the M85 Unit (Example)

The following example programs the M85 unit to:

• Turn on

• Initialize to 2 VDC, at 1A

• Set overvoltage protection level at 3 VDC

• Verify proper power-on initialization

• Save and store changes.

// Use SYST:ERR? after each command to verify no programming errors. // turn on the unit. *CLS // clear the unit to its power on default settings. *RST // reset the unit. CAL[n]:INIT:CURR 1.0 // set power-on initial current to 1.0A. CAL[n]:INIT:CURR? // confirm power-on initial current setting. CAL[n]:INIT:VOLT 2.0 // set power-on initial voltage to 2.0V. CAL[n]:INIT:VOLT? // confirm power-on initial voltage setting. CAL[n]:INIT:VOLT:PROT 3.0 // set power-on initial overvoltage protection to 3.0V. CAL[n]:INIT:VOLT:PROT? // confirm power-on initial overvoltage protection setting. CAL[n]:UNLOCK “6867” // unlock nonvolatile memory for calibration value storage. CAL[n]:STORE // store the calibration values in nonvolatile memory. CAL[n]:LOCK // lock nonvolatile memory for calibration value protection. // cycle power to unit. // note voltage is initialized to 2.0 VDC via front panel. SOUR[n]:CURR? // confirm power-on initial current setting. SOUR[n]:VOLT? // confirm power-on initial voltage setting. SOUR[n]:VOLT:PROT? // confirm power-on initial overvoltage protection setting.

6-4 M9 Programming Manual

SECTION 7

SCPI STATUS IMPLEMENTATION

The M9 product line, as of August 1999, has branched into two families in regards to the SCPI Status implementation. There is a subtle but meaningful difference regarding how the SCPI Standard Event Status Register is treated in the newer of these two SCPI implementations.

If your product has the DCS or PRO-T model name designation, it incorporates the older implementation. If your product has the DLM model designation, it is the newer of the two SCPI implementations.

To ascertain what implementation you have, you may query your supply via SCPI with the *IDN? command:

• Issue the *IDN? query command. A response string to the *IDN? query command

should result, such as “Sorensen, DCS33-33, B90000-0, 2.05,1.2” or such as “Sorensen, DLM33-33, B90000-0, 1.01,1.2”

• The second to last number in the response to the *IDN? response string represents the

version number of the respective firmware you have. So, for example, if your response string is something similar to “Sorensen, DCS33-33, B90000-0, 2.05,1.2”, then you have DCS firmware version 2.05.

Once you have identified the branch of firmware you have, then you can determine which implementation of the SCPI Standard Event Status Register you have. The SCPI Standard Event Status Register, SESR for short, is read using the *ESR? command. In both implementations, this command operates as expected. But under what conditions the contents of the SESR is meaningful is different depending upon whether you have the DCS implementation or the DLM implementation.

To understand the subtle but noteworthy difference, find the SESER and the SESR registers on the following two figures. They show that the order of occurrence for the SESER and the SESR in a data flow sense is reversed between these two implementations. Read the text in the two figures that follow to better understand the consequences of this implementation difference.

M9 Programming Manual 7-1

SCPI Status Implementation Sorensen DCS, DLM, PRO-T Series

If you have DCS firmware, certain SCPI compatibility issues may be improved by using a special command at power-on time. DCS firmware versions 2.04 and earlier incorrectly cleared the status byte after serial polling; contrary to the SCPI/IEEE standard. And the persistence of various bits in the status byte in version 2.04 and older is an issue. For DCS firmware versions

2.05 and later, the special command “SYST:ADJSTAXAA 1” may be issued once at each power-on time to activate a fix for these status problems. This paragraph does not apply to the DLM firmware.

7-2 M9 Programming Manual

The Protection Enable Register. Readable using the STAT:PROT:ENAB? query command. Write-able using the STAT:PROT:ENAB <value> command. Used to select what fault events may set a bit in the Fault Register. Certain faults can occur even if they are not enabled. This is because the Protection Enable Register merely filters which events are allowed to affect the Fault Register, not whether those events can occur or not. An exception to this rule involves the Constant Voltage Operation, Constant Current Operation, and Foldback Mode Operation bits. If these bits are not enabled, then mode changes shall not cause a shutdown. Read about these bits further in the manual.

Various fault events must be enabled by the protection enable register before they are recorded in the fault register.

Fault Register (also called the Protection Event Register). Readable using the STAT:PROT:EVEN? query command.

Bit Hex Value Description 0 0x01 Constant Voltage Operation 1 0x02 Constant Current Operation 2 0x04 Converter Fault 3 0x08 Overvoltage Protection Fault 4 0x10 Over Temperature Fault 5 0x20 External Shutdown 6 0x40 Foldback Mode Operation

A total of 31 fault registers may feed into this OR gate to summarize a fault from any of 30 possible slave supplies and one master supply.

7 0x80 Remote Programming Error

Various events must be enabled by the SESER before they are recorded in the SESR. This makes polling the SESR with the SESER clear unfeasible.

SCPI Status Structure for the DCS Firmware Implementation

7-3

The SESER (Standard Event Status Register). This register is read using the *ESE? SCPI query command. This register is written to using the *ESE <value> command. A “1” in the appropriate bit location enables various standard event type events to be recorded in the SESR.

Bit Hex Value Description

0 0x01 Operation Complete 1 0x02 Request Control (Not Used) 2 0x04 Query Error (Not Used) 3 0x08 Device Dependent Error 4 0x10 Execution Error (e.g., range error) 5 0x20 Command Error (e.g., syntax error) 6 0x40 User Request (Not Used) 7 0x80 Power On

The SESR (Standard Event Service Register). In the DCS implementation, the SESER must have the appropriate bits set to enable even the recording of an event in the SESR. The SESR is read using the *ESR?.

The SCPI Status Byte. Read using either the *STB? command, or the GPIB serial poll operation. In the M9E implementation, reading this byte does not clear it; this is per SCPI/IEEE requirements.

Seven bit wise logical AND operations

Bit Hex Value Description

0 0x01 Not Used 1 0x02 Protection Event Flag 2 0x04 Error/Event Queue Message Avail. 3 0x08 Questionable Status (Not Used) 4 0x10 Message Available 5 0x20 Standard Event Status Register 6 0x40 RQS/MSS Service Request Bit 7 0x80 Operation Status Flag (Not Used)

The Service Request Enable Register (SRER). Used to enable which Status Byte bits can affect the service re

uest bit. *SRE? reads. *SRE <value> writes.

7-4

Fault Register (also called the Protection Event Register). Readable using the STAT:PROT:EVEN? query

Various fault events must be enabled by the protection enable register before they are recorded in the

Bit Hex Value Description

0 0x01 Constant Voltage Operation 1 0x02 Constant Current Operation 2 0x04 Converter Fault 3 0x08 Overvoltage Protection Fault 4 0x10 Over Temperature Fault 5 0x20 External Shutdown 6 0x40 Foldback Mode Operation 7 0x80 Remote Programming Error

fault register.

A total of 31 fault registers may feed into this OR gate to summarize a fault from any of 30 possible slave supplies and one master supply.

The SESER (Standard Event Status Enable Register). This register is read using the *ESE? SCPI query command. This register is written to using the *ESE <value> command. A “1” in the appropriate bit location enables that corresponding bit from the SESR to pass through to the input of the OR gate to be included in the SESR summary bit (bit 5) in the SCPI Status Byte.

Bit Hex Value Description

0 0x01 Operation Complete

Various events set the SESR bits directly.

1 0x02 Request Control (Not Used) 2 0x04 Query Error (Not Used) 3 0x08 Device Dependent Error 4 0x10 Execution Error (e.g., range error) 5 0x20 Command Error (e.g., syntax

error) 6 0x40 User Request (Not Used) 7 0x80 Power On

The SESR (Standard Event Service Register). In the DLM implementation, masking does not prevent events from setting bits in the SESR. This facilitates polling as one means of detecting these events since the SESR can be polled (read) using the *ESR? command, irrespective of the bits set or not set in the Standard Event Status Enable Register.

SCPI Status Structure for the DLM Firmware Implementation

The SCPI Status Byte. Read using either the *STB? command, or the GPIB serial poll operation. In the M9E implementation, reading this byte does not clear it; this is per SCPI/IEEE requirements.

Seven bit wise logical AND operations

Bit Hex Value Description

Eight bit wise logical AND operations

service re

The Service Request Enable Register (SRER).

Used to enable which Status Byte bits can affect the

uest bit. *SRE? reads. *SRE <value> writes.

7-1

Auxiliary Unit (M85 only), 2-4

CALibrate[n], 3-10 Calibration

Current Measurement/Readback

Calibration, 4-7

Current Programming and Readback

Calibration, 4-9 Current Programming Calibration, 4-6 Overvoltage Protection Programming

Calibration, 4-5 Setup for Calibration, 4-2 Voltage Measurement/Readback

Calibration, 4-4 Voltage Programming and Readback

Calibration, 4-8 Voltage Programming Calibration, 4-3 Warning, 4-1, 4-2

Conventions, 3-7

[ ], 3-7

Default Master Channel 1, 2-4

Error/Event Queue, 3-3

SCPI Error Codes, 3-4

Examples of Using M9A Commands, 5-10 Examples of Using SCPI Commands, 3-25 External User Control Signal Connector

FAULT output signal, 2-5 FOLDBACK output signal, 2-5 ISOLATION output signal, 2-5 POLARITY output signal, 2-5 SENSE output signal, 2-5 SHUTDOWN TTL input signal, 2-5

INDEX

SYNC output signal, 2-5

External User Control Signal Connector, 2-5

Illustration of Open Collector, TTL Input,

and Relay Output Circuits, 2-6

Warning, 2-6

Features and Functions, 1-1 Front Panel REMOTE LED, 2-1 Front Panel SRQ LED, 2-4

Global Channel 0, 2-4

IEEE-488.2 and SCPI Conformance

Information, 3-6

IEEE-488.2 Common Command

Subsystem, 3-8 *CLS, 3-8 *ESE, 3-8 *ESR?, 3-8 *IDN?, 3-8 *OPC, 3-8 *RST, 3-8 *SRE, 3-8 *STB?, 3-9 *TST?, 3-9 *WAI, 3-9

Local Operation, 2-3

M85, 2-8 M9, 1-1 M9A Command Operation

ASTS?, 5-6 CLR, 5-4 DLY, 5-7 ERR?, 5-7 Error Register, 5-3 FAULT?, 5-7 FOLD, 5-7 HOLD, 5-4 ID?, 5-4 IMAX, 5-5 IOUT?, 5-5 ISET, 5-5 MASK, 5-8 OUT, 5-5 OVSET, 5-8 RST, 5-4 SRQ, 5-8 Status and Fault Registers, 5-2 Status Byte, 5-1 STS?, 5-9 TRG, 5-5 UNMASK, 5-9 VMAX, 5-6 VOUT?, 5-6

VSET, 5-6 Master Unit (M9C only), 2-4 MEASure[n], 3-13 Multiple Source Control with the M85

Option, 2-8

RS-485 Rear Panel RJ-11 Connector

Pinout, 2-8

Operation Status and Questionable Status

Registers, 3-3 OUTPut[n], 3-14

Parameter Definitions, 3-6

0+NR1, 3-6

0+NRf, 3-6

boolean, 3-6

NR1, 3-6

NRf, 3-6

string, 3-6 Power-On Conditions, 2-3

Default, 2-3

Protection Event Status Register, 3-3

Queries, 3-7

Ramping

Description, 3-19

Rear Panel Configuration Switch

Address Selection, 2-4 Master/Auxiliary Selection, 2-4 Power-On GPIB Service Request (PON

SRQ) Selection, 2-4

Remote/Local Selection, 2-3 Rear Panel Configuration Switch S1, 2-2 Remote Operation, 2-3 Remote Programming via RS-232, 2-7

RS-232 Rear Panel RJ-11 Connector

Pinout, 2-7

SCPI Command Operation

CALibrate[n], 3-10

MEASure[n], 3-13

OUTPut[n], 3-14

Warning, 3-14

SOURce[n], 3-15

STATus[n], 3-20

TRIGgered[n], 3-24 Serial Poll Operation, 3-6 Setup Procedure, 2-1 SOURce[n], 3-15 Specifications, 1-2 Standard Event Status Register (ESR), 3-2 Status Byte, 3-1 Status Flags Register, 3-19 STATus[n], 3-20 Synchronization Pulse, 2-5

TRIGgered[n], 3-24

Units, 3-7

Index-2 M9 Programming Manual

Sorensen DLM 80-50E Programming Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Features and Functions

CONFIGURATION

Setup Procedure

2.2 Rear Panel Configuration Switch

2.3 External User Control Signal Connector

2.4 Remote Programming Via RS-232

2.5 Extended Interface Bus (EIB) with the M85 Option

Introduction

IEEE-488.2 Register Definitions

IEEE-488.2 and SCPI Conformance Information

3.4 IEEE-488.2 Common Command Subsystem

3.5 CALIBRATION SCPI Command Subsystem

MEASURE SCPI Command Subsystem

OUTPUT SCPI Command Subsystem

SOURCE SCPI Command Subsystem

STATUS SCPI Command Subsystem

SYSTEM SCPI Command Subsystem

TRIGGER SCPI Command Subsystem

CALIBRATION

4.2 Setup for Calibration

4.3 Voltage Programming Calibration

4.4 Voltage Measurement/Readback Calibration

4.5 Overvoltage Protection Programming Calibration

4.6 Current Programming Calibration

4.7 Current Measurement/Readback Calibration

4.8 Voltage Programming and Readback Calibration

4.9 Current Programming and Readback Calibration

M9A COMMAND OPERATION

5.2 M9A GPIB Register Definitions

5.3 M9A Command Subsystem Reference

5.4 Examples of Using the M9A Commands

OPERATION WITH M85 OPTION

6.5 Programming the M85 Unit (Example)

SCPI STATUS IMPLEMENTATION