EPS RS 232 User manual

EPS Stromversorgung GmbH
Telefon [phone]
Electronic Power Supplies
Fax [phone]
Alter Postweg 101
info@eps germany.de
D 86159 Augsburg
www.eps germany.de
M a n u a l
E P S / M P

Software version: V21
June 2014

Technical Specifications
Table of Contents
Technical Specifications .............................................................................................................................................. 4
Ambient Conditions ............................................................................................................................................................ 4
Input Specifications ............................................................................................................................................................ 4
Output Specifications ......................................................................................................................................................... 4
AI Interface ......................................................................................................................................................................... 5
RS 232 ................................................................................................................................................................................. 5
RS 485 ................................................................................................................................................................................. 5
Technical Drawing ............................................................................................................................................................... 6
Important Safety Instructions ..................................................................................................................................... 7
Initial Operation .................................................................................................................................................................. 7
Unpacking ........................................................................................................................................................................... 7
Setting Up ........................................................................................................................................................................... 7
Visual Inspection ................................................................................................................................................................. 7
Mains Operation ................................................................................................................................................................. 7
Functional Description ................................................................................................................................................
General Settings ......................................................................................................................................................... 9
Front Panel Description ...................................................................................................................................................... 9
Configuration ...................................................................................................................................................................... 9
Contrast ............................................................................................................................................................................ 10
Voltage Settings........................................................................................................................................................ 10
U
limit
and I
limit
..................................................................................................................................................................... 10
OVP (Over Voltage Protection) ......................................................................................................................................... 10
AI Type .............................................................................................................................................................................. 10
Remember Last Setting ..................................................................................................................................................... 10
Interface parameter (Option) ........................................................................................................................................... 10
Front Panel Operation .............................................................................................................................................. 11
Display and Settings .......................................................................................................................................................... 11
Current measurement values (Display) ................................................................................................................... 11
Main display ............................................................................................................................................................ 11
Operating modes .............................................................................................................................................................. 12
Main display overview ............................................................................................................................................ 12
Operating Mode description ................................................................................................................................... 13
Universal interface (Option) ..................................................................................................................................... 14
Commands ........................................................................................................................................................................ 14
Format ..................................................................................................................................................................... 14
Instruction Set ......................................................................................................................................................... 15
Quick view of commands ........................................................................................................................................ 15
Detailed description of commands ......................................................................................................................... 16
Response String ....................................................................................................................................................... 24
Ext. Control: Computer ............................................................................................................................................. 25
GPIB .................................................................................................................................................................................. 25
Status Word............................................................................................................................................................. 26
ESR Register Event Status Register....................................................................................................................... 26
RS232 interface ................................................................................................................................................................. 26
Interface Reconfiguration ....................................................................................................................................... 28
RS485 Interface ................................................................................................................................................................. 28
Interface Reconfiguration ....................................................................................................................................... 29

Technical Specifications
2
Ext. Control: AI Interface (Option) .............................................................................................................................29
Pin Assignment AI Interface .............................................................................................................................................. 30
Analog Input ..................................................................................................................................................................... 30
Set Point U (U
Set
) ..................................................................................................................................................... 30
Set Point I (I
Set
) ........................................................................................................................................................ 31
Set Point OVP (U
OVP
) ................................................................................................................................................ 31
Analog Output .................................................................................................................................................................. 31
Monitor Set Point U (U
mon
) ...................................................................................................................................... 31
Monitor Set Point I (I
mon
) ......................................................................................................................................... 31
Monitor Actual Value P (P
mon
) ................................................................................................................................. 31
Analog Output OVP (U
OVPmon
) .................................................................................................................................. 32
Monitor Output Voltage (U
Istmon
) ............................................................................................................................ 32
Monitor Output Current (I
Istmon
) .............................................................................................................................. 32
Digital Input ...................................................................................................................................................................... 32
Activation (Ext. Control) .......................................................................................................................................... 32
Soft Interlock........................................................................................................................................................... 32
Blocking (Standby) ................................................................................................................................................... 32
Digital Output ................................................................................................................................................................... 32
Blocking (Standby) ................................................................................................................................................... 32
Const. Voltage mode (CV) ................................................................................................................................................. 33
Error .................................................................................................................................................................................. 33
Ext. Control: Ethernet (LAN) ......................................................................................................................................33
Manual Assignment of an IP under Microsoft Windows® ................................................................................................ 33
Monitoring the device via browser................................................................................................................................... 34
Controlling the device via Telnet ...................................................................................................................................... 34
Controlling the device via browser ................................................................................................................................... 35
Ext. Control: USB .......................................................................................................................................................35
Interface Reconfiguration ................................................................................................................................................. 35
Data Log Function (Option) ........................................................................................................................................36
Format of the saved Data ................................................................................................................................................. 36
Script Mode ...............................................................................................................................................................36
Executing/Loading a Script ............................................................................................................................................... 36
Commands ........................................................................................................................................................................ 37
Syntax ...................................................................................................................................................................... 37
Quick view of commands ........................................................................................................................................ 37
Detailed description of commands ......................................................................................................................... 37
Controller ..................................................................................................................................................................41
Controller Structure PVsim Mode and User Mode ........................................................................................................... 42
Controller Structure UIP Mode ......................................................................................................................................... 42
Controller Structure UIR Mode ......................................................................................................................................... 42
Controller parameters ...................................................................................................................................................... 43
Sense Mode ...............................................................................................................................................................44
Load connection without Sensor Conductor .................................................................................................................... 44
Load Connection with Sensor conductor .......................................................................................................................... 44
Load Distribution without Sensor Conductor ................................................................................................................... 44
Appendix ...................................................................................................................................................................45
Equivalent leakage current measurement according to VDE 0701 .................................................................................. 45
Notes .........................................................................................................................................................................47

Technical Specifications

Technical Specifications
4
TECHNICAL SPECIFICATIONS
A MBIENT C ONDITIONS
Cooling
Fan
Operating temperature
0 50 °C
Storage temperature
20 70 °C
Humidity
< 80 %
Operating altitude
< 2000 m
Vibration
10 55 Hz/1 min/2G XYZ
Shock
< 20 G
Weight
5 kW 19 kg, 10 kW 26 kg, 15 kW 33 kg
I NPUT S PECIFICATIONS
EPS/MP models
(by max output power)
1.2 kW 2.4 kW
Connection
3 wire (1P+N+E)
AC socket on rear panel
IEC C14 IEC C20
Input voltage
230 V
ac
, 50/60 Hz (207 253 V
ac
47 63 Hz)
Input current
1
,
2
≈ 6.5 A
≈ 13 A
Inrush transient current
2
≈ 25 A
≈ 25 A
Main input fuse rating
10 A
16 A
Main input fuse type and location
built in fast acting PCB mounted cartridge fuse
Recommended supply breaker value
& curve
16 A type D 16 A type D
Leakage current
≈ 1.5 mA
≈ 1.5 mA
THD input current
≈ 3.75 %
≈ 10.75 %
THD input voltage
≈ 1.87 %
≈ 2.55 %
Power factor
≈ 0.99
≈ 0.99
Efficiency type
1
≈ 88 % (with PFC)
≈ 89 % (with PFC)
Dissipated power
1
≈ 165 W
≈ 350 W
O UTPUT S PECIFICATIONS
Static voltage regulation
± 0.05 % + 2 mV
Static current regulation
± 0.1 % + 2 mA
Dynamic regulation
< 1 3 ms (typ.)
Ripple
< 0.2 % RMS (typ.)
Stability
± 0.05 %
Programming accuracy (V
out
)
± 0.05 % +2 mV
Programming accuracy (I
out
)
± 0.05 % +2 mA
Display accuracy (V
out
)
< ± 0.5%
Display accuracy (I
out
)
< ± 0.5%
Isolation
3,000 V
Over voltage protection
0 120 % V
max
Circuit protection
OC/OV/OT/OP
Line regulation
< ± 0.1 % + 2 mV
1
for nominal output voltage and nominal output current
2
for nominal input voltage

Technical Specifications
AI I NTERFACE
Digital outputs
(CV, Standby, Error)
Output type: Open collector with pull up resistor 10 k after + 5 V
I
sinkmax
: 50 mA
Digital inputs
(Ext. Control, Standby)
Input resistance: 47 k
Ω
Maximum input voltage: 50 V
High level: U
e
> 2 V
Low level: U
e
< 0.8 V
Analog outputs (X
mon
)
Output resistance: 100
Ω
Minimum permissible load resistance: 2 kΩ
Minimum load resistance for 0.1 % accuracy: 100 kΩ
Analog inputs (X
set
)
Input resistance: 1 M
Ω
Maximum permissible input voltage: 25 V
Reference voltage
Reference voltage U
ref
: 10 V
±
10 mV
Output resistance: < 10 Ω
Maximum output current: 10 mA (not short circuit proof)
5 V Supply voltage
Output voltage: 5 V
±
300 mV
Maximum output current: 50 mA (not short circuit proof)
RS 232
Signal inputs (RxD, CTS)
Maximum input voltage:
±
25 V
Input resistance: 5 kΩ (Type)
Switching thresholds: U
H
< 3 V, U
L
> + 3 V
Signal outputs (TxD,RTS)
Output voltage (at R
Last
> 3 k
Ω): min
±
5 V, Type
±
9 V, max
±
10 V
Output resistance: < 300 Ω
Short circuit current: Type ± 10 mA
RS 4 5
Maximum input voltage
± 5 V
Input resistance
> 12 kΩ
Output current
± 60 mA Max
High level
U
d
> 0.2 V
Low level
U
d
< 0.2 V

Technical Specifications
6
T ECHNICAL D RAWING

Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
Please read this manual thoroughly before putting the device
into operation. Pay regard to the following safety instructio ns
and keep this manual nearby for future purpose.
This operating manual is based on the state of technology at the time of printing. However, it is possible that despite
regular control and correction, the present document contains printing errors or deficiencies. EPS Stromversorgung
GmbH assumes no liability for any technical, printing or translational errors within this manual.
I NITIAL O PERATION
U NPACKING
Please make sure that the shipping carton and the packaging is free of damage. If external damage is found, it is
important to record the type of damage. Please keep the original packaging to ensure the device is adequately
protected in case it needs to be transported in the future or claims for compensation need to be asserted.
S ETTING U P
To avoid electric shocks and product failure, the device should be installed in a temperature and humidity controlled
indoor environment. The ambient temperature must not exceed 50 °C. The device must never be exposed to liquids or
extreme humidity.
V ISUAL I NSPECTION
The unit must be examined immediately for defects or damages in transit. Damages caused during transport may be
loose or broken control knobs and bent or broken connectors. Do not use the device if any physical damage is
apparent. Please inform the carriers and a representative of EPS Stromversorgung immediately.
M AINS O PERATION
Make sure to verify the model number and voltage stated on the nameplate. Damages due to wrong power feed are
not covered by guarantee conditions.
The unit must only be operated when connected directly to the
mains. To avoid damage, do not connect the unit to
isolating transformers, auto-t ransformers, magnetic cu rrent
limiters or similar devices.

Functional Description
8
FUNCTIONAL DESCRIPTION
The following block diagram gives information about the various adjustment options.
Basically, four different operation modes are available:
UI mode
Unit is operated with current and voltage limitation.
UIP mode
Unit is operated with current, voltage and power limitation.
UIR mode
Unit is operated with current, voltage and power limitation. Additionally, the set value for
voltage is calculated by means of the present output current to simulate an internal
resistance.
Table mode
Set
values for current and voltage are saved in a table. Therefore, UI characteristics can be
easily adjusted.
There are three different ways to program the table:
PV
sim
mode
The UI characteristic of a solar generator is calculated with the Uo, Ik, Umpp and
Impp
parameters and then written to the table.
Memory card
The table can be programmed using a script from a memory card.
A script is a simple text file ( Script Control).
Digital interface
The table can be programmed using the digital interface (

Universal Interface
,
WAVE
Command bzw. DAT Command).

General Settings
The adjustment of set points and the selection of an operation mode are performed via console ( Front Panel
Operation), interface ( Universal Interface) or analog/digital IO ( Ext. Control AI-Interface).
In order of priority, commands which have been sent by interface come first, by analog/digital IO come second and by
keyboard come third. For example, if the interface specifies the set point, the corresponding values will be sent to the
output, irrespective of other settings.
Another easy way to automate functions is offered by script control ( Script Control). A list of commands is saved to
the script memory and enables the user to change the chronological sequence of certain settings. The script memory
can be programmed via memory card or digital interface.
Measurement values of the latest output data are permanently available at all interfaces. Therefore, the present
output voltage can be read from the display or via digital interface, while the control of the unit is carried out via
analog/digital IO.
GENERAL SETTINGS
F RONT P ANEL D ESCRIPTION
The picture above shows a schematic view on the front panel of the EPS/MP. There are 3 buttons to control the unit.
Basic functions of the control buttons:
Standby
release or lock the output, quit OVP
Display
short press: change displayed information, long press: change between main menu and setup menu
Select
press: change selected menu point, rotate: change selected value
C ONFIGURATION
The configuration menu can be accessed by holding the button Display for at least 1 second. This opens a menu
where general settings of the unit can be changed. To browse through the different options, the button Select must
be pushed. To change a setting the button Select must be rotated.
Setup options:
U
limit
0 V V
max
; set maximum output voltage which is selectable at the front panel
I
limit
0 V V
max
; set maximum output current which is selectable at the front panel
OVP
0 V 1.2 x V
max
; set over voltage protection activation value
AI Mode
5 V/10 V; select the AI control voltage range
Remember Last Setting
ON/OFF; activate or deactivate the settings memory after a power down the unit
The displayed temperature is the temperature of the heat sinks. Temperature 1 is the temperature of the PFC heat
sink and temperature 2 is the temperature of the power unit heat sink.

Voltage Settings
10
C ONTRAST
After the unit has been switched on, the display shows the EPS logo. The contrast of the display can be adjusted by
using the rotary pulse encoder Select . Afterwards, the contrast settings will be saved automatically.
VOLTAGE SETTINGS
U
LIMIT
AND I
LIMIT
U
limit
limits the maximum output voltage. The output voltage is limited to the selected value, irrespective of the values
that have been set at the front panel or at one of the interfaces. The adjustment range is 0 V up to the maximum
rated voltage of the device.
I
limit
limits the maximum output current. The output current is limited to the selected value, irrespective of the values
that have been set at the front panel or at one of the interfaces. The adjustment range is 0 A up to the maximum
rated current of the device.
These settings can only be changed at the display and they apply to all interfaces.
OVP (O VER V OLTAGE P ROTECTION )
The output is shut immediately if the output voltage exceeds the selected value. The display indicates this status with
the word ‚OVP‘. To reset this error, push the button Standby . The OVP value applies to the front panel operation.
There may apply different values for the AI interface and the digital interface. The digital interface is initialized with
the value which has been adjusted on the front panel. The adjustment range is 0 V up to the maximum rated voltage
of the device + 20 %.
AI-T YPE
This feature adjusts the voltage levels of analog input signals and analog output signals. Selectable ranges are 0 5 V
and 0 10 V.
R EMEMBER L AST S ETTING
If this option is activated (‚On‘), selected parameters will be kept after a blackout. If this option is deactivated (‚Off’),
standard setting (0V/0A/UI Mode) will be loaded after supply voltage is enabled.
I NTERFACE PARAMETER (O PTION )
The display shows all available digital interfaces and their changeable parameters. To see interface parameters, push
the button Display for 1 second. Push this button again to see the first interface and its changeable parameters,
which can be selected by pushing the rotary pulse encoder and changed by turning the rotary pulse encoder (function
of the parameters  Universal Interface).

Front Panel Operation
FRONT PANEL OPERATION
D ISPLAY AND S ETTINGS
Current measurement values (Display)
In normal mode, pushing the button Display switches between five different overview screens.
Main display
The main display shows current measure and set values. The display is divided in two separate displays. After enabling
the unit, the measured values for output voltage and putput current (position 1 and 2) are displayed. On the right
display (position 6) the actual set value (Preset V
set
) is shown. To change this value, the rotary pulse encoder Display
must be turned. Pushing the button Select , toggles through the next set parameters (in UI mode it will be output
current). To open the mode select menu (left display, position 3) where different operation modes are available, the
button Select must be pushed again.
Selectable parameters according to operation mode:
U
Output voltage
I
Ouput current
P
Output power (UIP mode only  UIP mode)
R
i
Internal resistance (UIR mode only  UIR mode)
U
mpp
MPP voltage (PV
sim
mode only  PVsim mode)
I
mpp
MPP current (PV
sim
mode only  PVsim mode)
Selectable options in current control mode (left display, position 5):
Loc
Front panel operation
Scr
Memory card operation
AI
Analog interface operation
Rem
Interface operation
LLO
Interface operation , Front panel operation locked
Dis
Unit locked via interlock input (option)
Available modes for operating status of the unit (left display, position 4):
STB
Standby mode
CV
Voltage limitation mode
C
Current limitation mode
CP
Power limitation mode
OVP
Deactivation of the unit by over voltage protection
Available operation modes of the unit (left display, position 3):
UI
Voltage and current limitation
UIP
Voltage, current and power limitation
UIR
Voltage and current limitation, simulated internal resistance
PV
sim
Simulation of a photovoltaic characteristic
User
Simulation of a user defined characteristic

Front Panel Operation
12
O PERATING MODES
Main display overview
Main display 1
After power up, the display shows the actual output voltage and output current.
Main display 2
After pushing the button Select once, actual output voltage and output power are shown on the display.
Main display
After pushing the button Select twice, actual output power and output current are shown on the display.
Main display 4
After pushing the button Select thrice, actual output voltage and output current are shown on the left display and
actual output power (P = U
*
I) and load resistor (R = V ÷ C) are shown on the right display. The values for power and
resistor will be calculated from the actual values of the output voltage and the output current.
Main display 5/diagram screen
After pushing the button Select four times, actual output voltage and output current are shown on the left display.
The output characteristic of the power supply is shown on the right display. The X axis shows the output voltage and
the Y axis shows the output current.
The picture above shows the UIR mode of the power supply. The dot marks the actual operation point of the unit. The
diagram is always scaled for the maximum allowed output current (this value can be set in the setup menu (I
limit
)) and
the maximum allowed output voltage (this value can be set in the setup menu (U
limit
)).

Front Panel Operation
Operating Mode description
UI Mode
In UI mode, the set values for voltage and current are transferred directly to the switch mode regulator. There is no
additional digital control.
UIP Mode
In UIP mode, the set values for voltage and current are transferred directly to the switch mode regulator. If the output
current exceeds the previously adjusted limit value, the current set point will be regulated.
UIR Mode
In UIR mode, the voltage set point is regulated in a way that a power supply unit with (adjustable) internal resistance
is simulated. The set value for current limiting is transferred directly to the switch mode regulator.
PV
sim
Mode
In PV
sim
mode, the diagram of a PV generator is simulated. Given values are open circuit voltage U
o
, short circuit
current I
k
, as well as the amounts of voltage and current by which the PV generator delivers the maximum power
(U
mpp
, I
mpp
). Parameters can be found in the specification sheet of the simulated PV generator.
Values for U
mpp
may be in a range from 0.6 to 0.95
*
U.
Values for I
mpp
may be in a range from 0.6 to 0.95
*
I.
Script Mode
In script mode, the unit is controlled by memory card. The display status ‚Mode‘ shows the present operating mode
‚UI‘. The lower right corner of the display shows the word ‚Scr‘, which indicates that script operation was selected. If
there is no memory card in the slot, this option cannot be selected. For detailed information about memory card
control and about how to build up a script, see  Script Control.

Universal interface (Option)
14
UNIVERSAL INTERFACE (OPTION)
All interfaces of the digital interface are equal. There is no shift between the interfaces. For example, the first
command can be issued via the IEEE interface while the second command can be issued via the RS232 interface. The
return values will be sent from that interface the command was issued from.
C OMMANDS
Communication is based on an ASCII protocol. The following chapters describe how to write a command and give an
overview over the commands.
Format
A command consists of the command word, a parameter (if necessary) and a terminator. The character for the
terminator is Carriage Return <CR> or Line Feed <LF> .
Character ASCII Dec value Hex value
Carriage Return
<CR>
13
0d
Line Fee
<LF>
10
0a
If the command contains a <DEL> or <ESC> character, it will not be processed. Therefore, a command can be cancelled
while entering. Though, a terminator ( <CR> or <LF> ) is necessary.
Character ASCII Dec value Hex value
Escape
<ESC>
27
1b
Delete
<DEL>
127
7f
Commands are not case sensitive and may be mixed up. Therefore, the effect of the following commands is the same:
GTL, Gtl, gTL. Decimal places are optional and separated by a full stop ‘.‘ . The number of decimal places is not limited.
Therefore, the effect of the following commands is the same: UA,10, UA,10.0, UA,10.000000000, UA,0010,
UA,010.0000
The number of decimal places to be analyzed depends on parameter and unit type. It corresponds to the number of
decimal places, a command without a parameter would return. As a rule, decimal places are analyzed until a
resolution of 0.1% is reached.
Example: Evaluation of decimal places
EPS/MP with 600 V, 25 A
600 V * 0.1 % = 0.6 V one decimal place
25 A * 0.1 % = 0.025 A three decimal places
Optional, after a numerical value, a letter may be added to indicate the unit. However, this letter will not be analyzed.
Example: Attached letter as unit
UA,10.0 V Resets output voltage to 10 V
UA,10.0 m Caution! The ‚m‘ will not be evaluated, output voltage here is also 10 V
Example: A valid command with corresponding hex values
U A , 1 0 . 2 <CR>
55 h 41 h 2 ch 31 h 30 h 2 eh 32 h 0 dh
Example: Adjustment of output voltage 10 V/5 A (full command sequence)
OVP,100 adjusts OVP to 100 V
UA,10 adjusts output voltage to 10 V
IA,5 current limiting 5 A
SB,R output enabled

Universal interface (Option)
Instruction Set
The IEEE 488.2 standard demands several basic commands. Some commands may occur twice for compatibility
reasons (once in the EPS version and once in the (old) IEEE 488.2 version). The following syntax is used to describe the
commands:
[] Square brackets  optional parameter
<> Angle bracket  numerical value
{} Curly bracket  selection list
| Vertical line  separator within selection list
Example
GTR[,{0|1|2}] means that the command GTR can be used with or without parameters. If a parameter exists, it has to be 1, 2 or 3. Valid
commands are: GTR GTR,1 GTR,2 GTR,3
IA[,<imax>] means that the command IA can be used either with or without parameters. If a parameter exists, it has to be a numerical
value.
Quick view of commands
Command Description Result
CLS* or CLS
Clear Status
Deletes the status byte
DAT,<U>,<I>
DIP
Data for user
defined characteristic
DCL
Device Clear
Initialization data reset
GTL
Go To Local
Activates front panel operation
GTR[,{0|1|2}]
Go To Remote
Activates digital interface
operation
IA[,<imax>]
Set I
max
Adjusts current limiting
ID or *IDN?
Identification
Displays identification string
IMPP[,<impp>]
Set I
mpp
Adjusts MPP current during PVsim mode.
LLO
Local Lockout
Deactivates LOCAL button
LIMI
Limit I
a
Reads maximum
adjustable current limitation
LIMP
Limit P
a
Reads maximum unit output.
LIMR
Limit R
Reads adjustable range for R
i
within UIR mode.
LIMRMAX
Limit R
max
Reads maximum adjustable range for R
i
within UIR mode.
LIMRMIN
Limit R
min
Reads minimum adjustable
range for R
i
within UIR mode.
LIMU
Limit U
a
Reads maximum adjustable voltage limitation
MODE[,{UI|UIP|UIR|PVSIM|
USER|Skript}] Set Mode Selects operation mode
MU[,<Nr>]
Measure U
a
Measures present output voltage
MI[,<Nr>]
Measure I
a
Measures present
output current
*OPT?
Optional Identification Query
Displays units current hardware/software version
OVP[,<U
ovp
>]
Overvoltage Protection
Adjusts over voltage protection
PA[,<P
limit
>]
Set P
max
Adjusts power limitation
PCx[,<baud>,<parity>,
<data bits>,<stop bits>,
<handshake>,<echo>,
<timeout>]
Program
Communication Adjusts the interfaces
RA[,<R
i
>]
Set R
i
Adjusts internal resistance
REGLER[,<Nr>,<Kp>,<Ki>,
<Kd>] Controller Parameters Adjusts controller parameters for UIP, UIR and PVsim mode
RI or
*RST
Reset Instrument
Resets hardware (no return value)
SB[,{S|R|1|0}]
Standby
Enables/blocks the output
SCR[,<CMD>[,<value>]]
Load Script
Programming of script memory
SS or *PDU Save Setup
Saves previously made channel and interface parameter
adjustments (no return
value)
STATUS Status
Query of the units status (return values in binary format) (also see following
table)
STB or *STB?
Interface Status
UA[,<ua>] Set U
a
Adjusts output voltage (if there are no parameters, present set point is
displayed)
UMPP[,<umpp>] Set U
mpp
Adjusts MPP voltage in PV
sim
mode (if there are no parameters, present set point
is displayed)
WAVE End Userwave Data
Ends transfer of user
defined output characteristic (gradual interpolation of
intermediate values)
WAVELIN End Userwave Data
Ends transfer of user
defined output characteristic (linear interpolation of
intermediate values)
WAVERESET,<Um>,<Im>
Start Userwave Data
Starts transfer of user
defined output characteristic

Universal interface (Option)
16
Detailed description of commands
CLS* or CLS - Clear Status
This command deletes the status byte. It affects only the status byte of the interface, the command was sent from. No
return value. For detailed description of the status byte see the different interface chapters.
DAT,<U>,<I> - Data
Data for a user defined characteristic. No return value. For detailed description of this command see  Wavereset.
DCL - Device Clear
This command resets the initialization data. No return value.
Caution: Interface parameters are also reset!
GTL - Go To Local
This command activates front panel operation. If ‚Local Lockout‘ (LLO) was activated before, it will also be reset. No
return value.
GTR[,{0|1|2}] - Go To Remote
This command activates digital interface operation. The optional parameter affects the future behavior of the unit
after switch on. Setting is saved permanently. No return value.
Optional parameter 0 = Deactivates automatic remote operation
The command GTR must be entered to activate the unit’s remote operation mode. This mode is useful if the unit shall be operated
manually and at the same time, measurement values shall be read out via the digital interface.
Optional parameter 1 = Activates remote operation on first addressing
Unit switches to remote operation when receiving a command via digital interface. The only exception is the GTL command, which
switches the unit to local mode.
Optional parameter 2 = Activates remote operation immediately after switch on
After the unit was switched on, remote mode is immediately activated. Front panel operation is deactivated.
IA[,<imax>] - Set I
max
This command adjusts current limiting. Entering the command without parameters displays the set value. If the set
value is higher than the maximum current of the unit, the range error bit within the ESR register of the interface is set.
The present set value remains unchanged. If the set value is higher than the I
limit
value, which was adjusted by the
user’s settings, but lower than the maximum current of the unit, the current is limited to the I
limit
value. No error
message.
Example: 300 A unit, I
limit
adjusted to 200 A via configuration menu
GTR Remote operation
OVP,200 Over voltage protection 200 V
UA,10 Output voltage 10 V
IA,100 Output current 100 A
SB,R Output open
IA,400 Output current 400 A, this command is ignored, because the current is higher than the maximum current of the device.
„Rangeerror“ is set within the status byte.
IA,250 Output current 250 A, since the output current was limited to 200 A via configuration menu, current limiting is set to 200
A. Error bit is not set.
IA Query of the adjusted current.
IA,200.0A Unit answers: I
limit
= 200 A
In master/slave mode, the current of a programmed device is adjusted. Connected in parallel, the total current is n x IA.
Example:
In M/S mode, 3 devices are connected parallel. IA,10 programs an output current of 10 A. All connected devices are set to 10 A. Since 3
devices have been connected parallel, the total current is 3 x 10A = 30A.
ID or IDN? - Identification
This command displays the identification string. Return value: <ID String>.