Hioki SM7420 User manual

EN
Communications Command
SM7420
SUPER MEGOHM METER
July 2018 Revised edition 1
SM7420A964-01 18-07H
Instruction Manual
This manual explains the communication commands for Model SM7420 Super
Megohm Meter.
Please refer to the instruction manual for Model SM7420 for details regarding
command settings.
Although all reasonable care has been taken in the production of this manual, should
you find any points which are unclear or in error, please contact your local distributor
or the HIOKI International Sales Department at [email protected].
In the interest of product development, the contents of this manual may be subject to
revision without notice.
Unauthorized copying and replication of the contents of this instruction manual are
strictly prohibited. All Rights Reserved.
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Contents
1 Introduction .........................................................................................................................................1
Message Format ..................................................................................................................................1
Output Queue and Input Buffer ..........................................................................................................4
Status Byte Register............................................................................................................................5
Event Registers....................................................................................................................................6
Initialization Items................................................................................................................................8
Local Function.....................................................................................................................................9
Command Execution Time..................................................................................................................9
Errors During Communications .........................................................................................................9
2 Message List....................................................................................................................................... 10
3 Message Reference............................................................................................................................ 13
Message Reference Interpretation ...................................................................................................13
Standard Commands.........................................................................................................................14
(1) System Data Command..........................................................................................................14
*IDN?---Query Instrument ID (Identification Code) ..................................................................14
(2) Internal Operation Command ................................................................................................14
*RST---Initialize Instrument (Normal Reset)..............................................................................14
*TST?---Execute Self-Test and Query Result ...........................................................................14
(3) Synchronization Commands .................................................................................................14
*OPC---Set OPC bit of SESR when Finished with All Pending Operations............................14
*OPC?---Respond with ASCII.....................................................................................................14
*WAI---Wait for Pending Commands to Finish.........................................................................15
(4) Status and Event Control Commands...................................................................................15
*CLS--- Clear Event Register, Status Byte Register (Except Output Queue).........................15
*ESE---Set and Query Standard Event Status Enable Register (SESER)...............................15
*ESR?---Query and Clear Standard Event Status Register (SESR)........................................15
*SRE---Set and Query Service Request Enable Register (SRER)...........................................16
*STB?---Query Status Byte and MSS Bit ..................................................................................16
*TRG---Request a Sample..........................................................................................................16
Device-Specific Commands..............................................................................................................17
(1) Measurement status...............................................................................................................17
:STARt---Measurement start ......................................................................................................17
:STOP---Measurement stop .......................................................................................................17
:STATe?--- Query measurement status.....................................................................................17
(2) Reading Measured Values .....................................................................................................18
:MEASure?---Query Measurement value .................................................................................18
:MEASure:COMParator?---Query Judgment of Measured Value............................................18
:MEASure:RESult?---Query Measurement value and Judgment...........................................18
:MEASure:CLEar---Clear Measuremt Value and Judgment Value.........................................18
(3) Tempureture and Humidity value ..........................................................................................19
:MEASure:TEMPerature?---Query Tempureture value............................................................19
:MEASure:HUMidity?---Query Humidity value.........................................................................19
(4) Measured value display mode...............................................................................................19
:MEASure:MODE---Set and Query Measured value display mode.........................................19
(5) Measuremt Format..................................................................................................................19
:MEASure:FORMat---Set and Query Measuremt format..........................................................19
(6) The Number of Displayed digits............................................................................................20
:MEASure:DIGit---Set and Query The Number of Displayed digits ........................................20
(7) Current Channel......................................................................................................................20
:CCHannel---Set and Query Current channel...........................................................................20
(8) Applied Voltage.......................................................................................................................20
:VOLTage---Set and Query Voltage value setting for resistance calculation........................20
(9) Measurement Speed...............................................................................................................20
:SPEEd---Set and Query Measurement Speed.........................................................................20
(10) Range.......................................................................................................................................21
:RANGe---Set and Query Current Range..................................................................................21
:RANGe:AUTO---Set and Query Auto Range............................................................................21
(11) Delay........................................................................................................................................21

:DELay---Set and Query Delay time ..........................................................................................21
(12) Average....................................................................................................................................22
:AVERage---Set and Query Average..........................................................................................22
:AVERage:COUNt---Set and Query average hold times..........................................................22
(13) Trigger .....................................................................................................................................22
:TRIGger---Set and Query Trigger Source................................................................................22
(14) Self-Calibration .......................................................................................................................22
:CALibration?---Execute and Query Self-Calibration ..............................................................22
:CALibration:AUTO---Set and Query Self-Calibration AUTO ..................................................23
:CALibration:TIME---Set and Query Self-Calibration time.......................................................23
(15) Contact check .........................................................................................................................23
:CONTactcheck:FREQuency---Set and Query contact check frequency...............................23
:CONTactcheck:WORKc---Set and Query contact check range.............................................24
:CONTactcheck:CABLe---Set and Query contact check cable length ...................................24
:CONTactcheck:CABLe:AUTO?---Query contact check cable length auto...........................24
:CONTactcheck:DELay---Set and Query contact check delay................................................25
:OPEN?---Query Jig capacity open correction.........................................................................25
:OPEN:VALue?---Query Jig capacity open value ....................................................................25
:CONTactcheck:STATe--- Set and Query contact check state ...............................................26
:CONTactcheck:LIMit---Set and Query contact check limit ....................................................26
:CONTactcheck?---Execute and Query contact check............................................................26
:CONTactcheck:VALue?---Query contact check value ...........................................................27
(16) Drawing update during measurement...................................................................................27
:DISPlay:UPDate---Set and Query drawing update during measurement..............................27
(17) Resistivity measurement function.........................................................................................27
:ELECtric:D1---Set and Query Diameter of the main electrode (D1) ......................................27
:ELECtric:D2---Set and Query Internal Diameter of the counter electrode (D2)....................28
:ELECtric:T---Set and Query Thickness of sample(t) ..............................................................28
:ELECtric:K---Set and Query Electrode constant (K) ..............................................................28
(18) Comparator .............................................................................................................................29
:COMParator:LIMit---Set and Query Comparator.....................................................................29
:COMParator:BEEPer---Set and Query Comparator Beeper...................................................29
(19) Panel saving and loading.......................................................................................................29
:PANel:SAVE---Set Panel saving...............................................................................................29
:PANel:SAVE?---Query already panel saving...........................................................................30
:PANel:LOAD---Load panel data ...............................................................................................30
:PANel:NAME---Set and Query panel name..............................................................................30
:PANel:CLEar---Delete panel data ............................................................................................30
(20) Key Beeper..............................................................................................................................31
：KEY:BEEPer---Set and Query Key Beeper..............................................................................31
(21) Key-lock...................................................................................................................................31
:SYStem:KLOCk---Set and Query Key-Lock State...................................................................31
(22) Internal memory......................................................................................................................31
:MEMory?---Query measurement value in memory.................................................................31
:MEMory:RANGe?---Query measurement value in memory (range specification) ...............32
:MEMory:STATe---Set and Query memory state......................................................................32
:MEMory:COUNt?---Query number of measurement value.....................................................32
:MEMory:CLEar---Set Memory clear.........................................................................................33
(23) D/A output function ................................................................................................................33
:DAOutput---Set and query the D/A output function................................................................33
(24) LCD ..........................................................................................................................................33
:DISPlay:MODE---Set and Query Display Mode .......................................................................33
:DISPlay:CONTrast---Set and Query Contrast..........................................................................33
:DISPlay:BACKlight---Set and Query Backlight.......................................................................34
(25) Line Frequency .......................................................................................................................34
:SYStem:LFRequency---Set and Query Line Frequency.........................................................34
:SYSTem:LFRequency:AUTO?---Query Automatic detection Line Frequency.....................34
(26) Reset........................................................................................................................................34
:RESet---Initialize Instrument (System Reset)..........................................................................34
(27) EXT I/O.....................................................................................................................................35

:IO:EDGE---Set and Query Trigger edge...................................................................................35
:IO:FILTer:STATe---Set and Query TRIG/PRINT Signal's Filter Function...............................35
:IO:FILTer:TIME---Set and Query TRIG Signal's Filter Time....................................................35
:IO:GOLogic---Set.......................................................................................................................36
:IO:EOM:MODE---Set and Query EOM Output Method............................................................36
:IO:EOM:PULSe---Set and Query EOM Pulse Width................................................................36
:IO:OUTPin?---Query Output Pin Status...................................................................................37
:IO:MODE?---Query NPN/PNP Switch Status ...........................................................................37
(28) Device Event Status Enable Register....................................................................................37
:DSE0---Set and Query Device Event Status Enable Register................................................37
:DSR?---Query Device Event Status Register ..........................................................................37
(29) Command Header...................................................................................................................38
:SYSTem:HEADer---Set and Query Header Presence..............................................................38
(30) Communications Settings......................................................................................................38
:SYSTem:LOCal---Return to Local Control...............................................................................38
:SYSTem:TERMinator---Set Delimiter [GP-IB]..........................................................................38
4 Measurement Value Format............................................................................................................... 39

1
1 Introduction
If the [COMMAND MONITOR] function is used at the time of program creation, commands and responses will be
conveniently displayed on the measurement screen. For information on the [COMMAND MONITOR] function, see the
instruction manual of the instruments.
Various messages are supported for controlling the instrument through the interfaces.
Messages can be either program messages, sent from the controller such as PC to the instrument, or response
messages, sent from the instrument to the controller.
Message types are further categorized as follows. Command Messages
Program Messages Query Messages
Messages
Response Message
When issuing commands that contain data, make sure that the data is provided in the specified format.
Message Format
Program Messages
Program messages can be either Command Messages or Query Messages.
(1) Command Messages
Instructions to control the instrument, such as to change settings or reset
Example: (instruction to set the measurement average)
:AVERage:COUNt 5
Header portion Space Data portion
(2) Query Messages
Requests for responses relating to results of operation or measurement, or the state of instrument settings
Example: (request for the current measurement average)
:AVERage:COUNt ?
Header portion Question mark
See: “Headers (p.2)”, “Separators (p.3)”, “Data Formats (p.3)”
Program Messages
Response Messages
Controller
Instrument

2
Response Messages
When a query message is received, its syntax is checked and a response message is
generated. :SYSTem:HEADercommand determines whether headers are prefixed to response messages.
Header ON :RANGE 1,200pA
Header OFF 1,200pA
(The current measurement range of CH1 is 200pA)
At power-on, Header OFF is selected.
If an error occurs when a query message is received, no response message is generated for that query.
Some query message has no header, such as :MEASure?.
Command Syntax
Command names are chosen to mnemonically represent their function, and can be abbreviated. The full command
name is called the “long form”, and the abbreviated name is called the “short form”. The command references in this
manual indicate the short form in upper-case letters, extended to the long form in lower case letters, although the
commands are not case-sensitive in actual usage.
:CALibration? OK (long form)
:CALIBRATION? OK (long form)
:CAL? OK (short form)
:CALIB? Error
:CA? Error
Response messages generated by the instrument are in long form and in upper case letters.
Headers
Headers must always be prefixed to program messages.
(1)Command Program Headers
There are three types of commands: Simple, Compound and Standard.
•Headers for Simple Commands
This header type is a sequence of letters and digits
:RANGe
•Headers for Compound Commands
These headers consist of multiple simple command type headers separated by colons “:”
:RANGe:AUTO
•Headers for Standard Commands
This header type begins with an asterisk “*”, indicating that it is a standard command defined by IEEE 488.2.
*RST
(2)Query Program Header
These commands are used to interrogate the instrument about the results of operations, measured values and
the current states of instrument settings.
As shown by the following examples, a query is formed by appending a question mark“?”after a program
header.
:AVERage?
:MEASure?
:MEASure:MONItor?

3
Message Terminators
This instrument recognizes the following message terminators (delimiters):
• CR
• CR+LF
Also the terminator for response messages is as follows:
• CR+LF(USB, RS-232C, GP-IB)
• LF(Only GP-IB)
Separators
(1)Message Unit Separator
Multiple messages can be written in one line by separating them with semicolons “;”
:RANGe 1,200pA;*IDN?
•When messages are combined in this way and if one command contains an error, all subsequent messages
up to the next terminator will be ignored.
(2)Header Separator
In a message consisting of both a header and data, the header is separated from the data by a space “ ” (ASCII
code 20H).
:AVERage:COUNt 5
Header portion Space Data portion
(3)Data Separator
In a message containing multiple data items, commas “,” are required to separate the data items from one
another.
:COMParator:BEEPer HI,TYPE1,1
Header data portion comma Data portion
Data Formats
The instrument uses character data, decimal numeric data and character string data depending on the command.
(1)Character Data
Character data always begins with an alphabetic character, and subsequent characters may be either
alphabetic or numeric. Character data is not case-sensitive, although response messages from the instrument
are only upper case. When the command data portion contains <1/0/ON/OFF >, the operation will be similar to
when 0 is OFF and 1 is ON.
:HEADER OFF
:HEADER 0
(2)Decimal Numeric Data
Three formats are used for numeric data, identified as NR1, NR2 and NR3. Numeric values may be signed or
unsigned. Unsigned numeric values are handled as positive values. Values exceeding the precision handled by
the instrument are rounded to the nearest valid digit.
•NR1 Integer data (e.g.: +12, -23, 34)
•NR2 Fixed-point data (e.g.: +1.23, -23.45, 3.456)
•NR3 Floating-point exponential representation data (e.g.: +1.0E-2, -2.3E+4)
The term “NRf format” includes all three of the above numeric decimal formats.
The instrument accepts NRf format data. The format of response data is specified for each command, and the
data is sent in that format.
•e.g.: NR1 :AVERage:COUNt 5
•e.g.: NR3 :OPEN:WORK 50E-12

4
Compound Command Header Omission
When several commands having a common header are combined to form a compound command (for
example, :DISPlay:CONTrast and :DISPlay:BACKlight), if they are written together in sequence, the
common portion (here, :DISPlay:) may be omitted after its initial occurrence.
This common portion is called the “current path” (analogous to the path concept in computer file storage), and until it
is cleared, the interpretation of subsequent commands presumes that they share the same common portion.
This usage of the current path is shown in the following example:
Full expression
:DISPlay:CONTrast 60;:DISPlay:BACKlight 80
Compacted expression
:DISPlay:CONTrast 60;BACKlight 80
This portion becomes the current path, and can be omitted from the messages immediately following.
The current path is cleared when the power is turned on, when reset by key input, by a colon “:” at the start of a
command, and when a message terminator is detected.
Standard command messages can be executed regardless of the current path. They have no effect upon the current
path.
A colon “:” is not required at the start of the header of a Simple or Compound command. However, to avoid
confusion with abbreviated forms and operating mistakes, we recommend always placing a colon at the start of a
header.
Output Queue and Input Buffer
Output Queue
Response messages are stored in the output queue until read by the controller. The output queue is also cleared in
the following circumstances:
•Power on
Input Buffer
The input buffer capacity of the instrument is 256 bytes.
If 10k bytes are allowed to accumulate in this buffer so that it becomes full, the interface will not accept data beyond
10k bytes.
Note: Ensure that no command ever exceeds 10k bytes.

5
Status Byte Register
Standard Event Register Description
Output Queue data information
Each of these bits corresponds to a specific event register
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Unused
MSS
ESB
MAV
DSB
Unused
Unused
Unused
Status Byte
Register (STB)
↑
↓
↓
↓
↓
↓
↓
Logical
sum
←&
&
&
&
&
&
↑
↑
↑
↑
↑
↑
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Unused
0
ESB
MAV
DSB
Unused
Unused
Unused
Service Request
Enable Register
(SRER)
Overview of Service Request Occurrence
The Status Byte Register contains information about the event registers and the output queue. Required items are
selected from this information by masking with the Service Request Enable Register. When any bit selected by the
mask is set, bit 6 (MSS; the Master Summary Status) of the Status Byte Register is also set.
Status Byte Register (STB)
When any Status Byte Register bit enabled by the Service Request Enable Register has switched from 0 to 1, the
MSS bit becomes 1.
Although the MSS bit is only read by an *STB? query, it is not cleared until a clear event is initiated by the *CLS
command.
Bit 7
ERR
Fatal Error.
Bit 6
MSS
This is the logical sum of the other bits of the Status Byte Register.
Bit 5
ESB
Standard Event Status (logical sum) bit
This is logical sum of the Standard Event Status Register.
Bit 4
MAV
Message arrival
Bit 3
DSB
Event summary (logical sum) bit 1
This is logical sum of the Event Status Register.
Bit 2
-
Unused
Bit 1
-
Unused
Bit 0
-
Unused
Service Request Enable Register (SRER)
This register masks the Status Byte Register. Setting a bit of this register to 1 enables the corresponding bit of the
Status Byte Register to be used.

6
Event Registers
Standard Event Status Register (SESR)
The Standard Event Status Register is an 8-bit register. If any bit in the Standard Event Status Register is set to 1
(after masking by the Standard Event Status Enable Register), bit 5 (ESB) of the Status Byte Register is set to 1.
See: “Standard Event Status Register (SESR) and Standard Event Status Enable Register (SESER)” (p.7)
The Standard Event Status Register is cleared in the following situations:
•When a * CLScommand is executed
•When an event register query ( * ESR? )
is executed
•When the instrument is powered on
Bit 7
PON
Power-On Flag
Set to 1 when the power is turned on, or upon recovery from an
outage.
Bit 6
(Unused)
URQ
User Request
Bit 5
CME
Command error (The command to the message terminator
is ignored.)
This bit is set to 1 when a received command contains a
syntactic or semantic error:
•Program header error
•Incorrect number of data parameters
•Invalid parameter format
•Received a command not supported by the instrument
Bit 4
EXE
Execution Error
This bit is set to 1 when a received command cannot be
executed for some reason.
•The specified data value is outside of the set range
•The specified setting data cannot be set
•Execution is prevented by some other operation being
performed
Bit 3
(Unused)
DDE
Device-Dependent Error
This bit is set to 1 when a command cannot be executed due to
some reason other than a command error, a query error or an
execution error.
Bit 2
(Unused)
QYE
Query Error (the output queue is cleared)
This bit is set to 1 when a query error is detected by the output
queue control.
•When an attempt has been made to read an empty output
queue (GP-IB only)
•When the data overflows the output queue
•When data in the output queue has been lost
•When the next command is received while there is data in the
output queue
Bit 1
(Unused)
RQC
Request Control
Bit 0
OPC
Operation Complete
This bit is set to 1 in response to an “*OPC” command.
•It indicates the completion of operations of all messages up to
the “*OPC” command

7
Standard Event Status Enable Register (SESER)
Setting any bit of the Standard Event Status Enable Register to 1 enables access to the corresponding bit of the
Standard Event Status Register.
Standard Event Status Register (SESR) and Standard Event Status Enable Register (SESER)
Status Byte Register (STB)
b i t 6
b i t5
bit4
MSS
ESB
MAV
Standard Event Status Register (SESR)
b i t 7
b i t 6
bit5
bit4
bit3
bit2
b i t1
b i t 0
PON
URQ
CME
EXE
DDE
QYE
RQC
OPC
↓
↓
↓
↓
↓
↓
↓
↓
Logical sum
←
&
&
&
&
&
&
&
&
↑
↑
↑
↑
↑
↑
↑
↑
b i t 7
b i t 6
bit5
bit4
bit3
bit2
b i t1
b i t 0
PON
URQ
CME
EXE
DDE
QYE
RQC
OPC
Standard Event Status Enable Register (SESER)
Device-Specific Event Status Registers (DESR)
This instrument provides two Event Status Registers for controlling events. Each event register is an 8-bit register.
When any bit in one of these Event Status Registers enabled by its corresponding Event Status Enable Register is
set to 1, Status Byte Register, bit 3 (DSB) is set to 1.
Event Status Registers are cleared in the following situations:
•When a *CLS command is executed
•When an Event Status Register query (:DSR?) is executed
•When the instrument is powered on
Device Event Status Register (DESR)
Bit 7
-
Unused
Bit 6
-
Unused
Bit 5
BOV
Measured data buffer overflow
Set when data is lost due to overflow of the measured data buffer.
Reset by reading this register.
Bit 4
BFL
Measure data buffer full
Set when the measured data buffer becomes full.
Reset when the buffer becomes empty.
Bit 3
STP
Measurement stop event
Set by one of the following factors:
The [STOP] key is pressed.
STOP was input by the handler interface.
The :STOP command is received.
Reset by reading this register.
Bit 2
-
Reserved bit
Bit 1
LM2
Reserved bit
Bit 0
LM1
Reserved bit

8
Device-Specific Event Status Enable Register (DESER)
Setting any bit of the Device-Specific Event Status Enable Register to 1 enables access to the corresponding bit of
the Standard Event Status Register.
Device-Specific Event Status Register (DESR) and Device-Specific Event Status Enable Register (DESER)
Status Byte Register (STB)
Bit4
Bit3
Bit2
MAV
DSB
Device Event Status Register (DESR)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Unused
Unused
BOV
BFL
STP
Unused
LM2
LM1
↓
↓
↓
↓
↓
↓
↓
↓
Logical
sum
&
&
&
&
&
&
&
&
↑
↑
↑
↑
↑
↑
↑
↑
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Unused
Unused
BOV
BFL
STP
Unused
LM2
LM1
Device Event Status Enable Register (DESER)
Register Reading and Writing
Register
Read
Write
Status Byte Register
*STB?
-
Service Request Enable Register
*SRE?
*SRE
Standard Event Status Register
*ESR?
-
Standard Event Status Enable Register
*ESE?
*ESE
Device Event Status Register 0
:DSR?
-
Device Event Status Enable Register 0
:DSE?
:DSE
Initialization Items
Initialization Method
Item
At
Power-on
*RST
Command
:RESet:SYS
Tem
Command
:RESet:NOR
Mal
Command
*CLS
Command
Interface setting
-
-
-
-
-
Device-specific functions (range, etc.)
-
●
●
●
-
Panel save data
-
-
●
-
-
Input buffer
●
-
-
-
-
Status Byte Register
●
-
-
-
●
Event registers
●*1
-
-
-
●
Enable register
●
-
-
-
-
Current path
●
-
-
-
-
Headers on/off
OFF
-
-
-
-
*1. Except the PON bit (bit 7).

9
Local Function
The Remote state is entered during communication. [RMT] is displayed in the measurement display and operation
keys are disabled.
Canceling the Remote state
• Pressing the [LOCAL] key on the front panel cancels the Remote state and enables key operations.
• Sending :SYSTem:LOCal command can also cancel the Remote state.
Command Execution Time
Command execution time indicates the time for analyzing and processing long form commands.
• Display delays may occur depending on the frequency of communication processes and process contents.
•All commands except *TRG and :CAL are processed sequentially.
•In communications with the controller, time must be added for data transmission. Transfer time depends on the
controller.
The Transfer time, with start bit 1, data length 8, no parity, and stop bit 1, has a total of 10-bit. When the transfer
speed (baud rate) setting is N bps, the general result will be as follows:
Transfer time T [1 character/sec] = Baud rate N [bps]/10 [bits]
If a measurement value is 11 characters, a 1 data transfer time will be 11/T.
(Example) For 9600 bps, 11/(9600/10) = Approx. 11 ms
Errors During Communications
An error occurs when messages are executed in the following cases:
•Command Error
When message syntax (spelling) is invalid
When the data format in a command or query is invalid
•Execution Error
When invalid character or numeric data is present
LOCAL

10
2 Message List
category
command
function
Standard Commands
*IDN?
Query Instrument ID (Identification Code)
*RST
Internal Operation
*TST?
Execute Self-Test and Query Result
*OPC
Set OPC bit of SESR when Finished withAll Pending Operations
*OPC?
Respond with ASCII “1” when Finished with All Pending Operations
*WAI
Wait for Pending Commands to Finish
*CLS
Clear Event Register, Status Byte Register (Except Output Queue)
*ESE
Set Standard Event Status Enable Register (SESER)
*ESE?
Query Standard Event Status Enable Register (SESER)
*ESR?
Query and Clear Standard Event Status Register (SESR)
*SRE
Set Service Request Enable Register (SRER)
*SRE?
Query Service Request Enable Register (SRER)
*STB?
Query Status Byte and MSS Bit
*TRG
Request a Sample
Measurement status
:STARt
Measurement start
:STOP
Measurement stop
:STATe?
Query measurement status
Reading Measured Values
:MEASure?
Query Measurement value
:MEASure:COMParator?
Query Judgment of Measured Value
:MEASure:RESult?
Query Measurement value and Judgment
:MEASure:CLEar
Clear Measuremt Value and Judgment Value
Tempureture and Humidity
value
:MEASure:TEMPerature?
Query Tempureture value
:MEASure:HUMidity?
Query Humidity value
Measured value display
mode
:MEASure:MODE
Set Measured value display mode
:MEASure:MODE?
Query Measured value display mode
Measuremt Format
:MEASure:FORMat
Set Measuremt format
:MEASure:FORMat?
Query Measuremt format
The Number of Displayed
digits
:MEASure:DIGit
Set The Number of Displayed digits
:MEASure:DIGit?
Query The Number of Displayed digits
Current Channel
:CCHannel
Set Current channel
:CCHannel?
Query Current channel
Applied Voltage
:VOLTage
Set Applied Voltage
:VOLTage?
Query Applied Voltage
Measurement Speed
:SPEEd
Set Measurement Speed
:SPEEd?
Query Measurement Speed
Range
:RANGe
Set Current Range
:RANGe?
Query Current Range
:RANGe:AUTO
Set Auto Range
:RANGe:AUTO?
Query Auto Range
Delay
:DELay
Set Delay time
:DELay?
Query Delay time
Average
:AVERage
Set Average
:AVERage?
Query Average
:AVERage:COUNt
Set average hold times
:AVERage:COUNt?
Query average hold times

11
category
command
function
Trigger
:TRIGger
Set Trigger Source
:TRIGger?
Query Trigger Source
Self-Calibration
:CALibration?
Execute and Query Self-Calibration
:CALibration:AUTO
Set Self-Calibration AUTO
:CALibration:AUTO?
Query Self-Calibration AUTO
:CALibration:TIME
Set Self-Calibration time
:CALibration:TIME?
Query Self-Calibration time
Contact check
:CONTactcheck:FREQuency
Set contact check frequency
:CONTactcheck:FREQuency?
Query contact check frequency
:CONTactcheck:WORKc
Set contact check range
:CONTactcheck:WORKc?
Query contact check range
:CONTactcheck:CABLe
Set contact check cable length
:CONTactcheck:CABLe?
Query contact check cable length
:CONTactcheck:CABLe:AUTO?
Query contact check cable length auto
:CONTactcheck:DELay
Set contact check delay
:CONTactcheck:DELay?
Query contact check delay
:OPEN?
Query Jig capacity open correction
:OPEN:VALue?
Query Jig capacity open value
:OPEN:ERRor?
Query Jig capacity open judgment
:CONTactcheck:STATe
Set contact check state
:CONTactcheck:STATe?
Query contact check state
:CONTactcheck:LIMit
Set contact check limit
:CONTactcheck:LIMit?
Query contact check limit
:CONTactcheck?
Execute and Query contact check
:CONTactcheck:VALue?
Query contact check value
Drawing update during
measurement
:DISPlay:UPDate
Set drawing update during measurement
:DISPlay:UPDate?
Query drawing update during measurement
Resistivity measurement
:ELECtric:D1
Set Diameter of the main electrode (D1)
:ELECtric:D1?
Query Diameter of the main electrode (D1)
:ELECtric:D2
Set Internal Diameter of the counter electrode (D2)
:ELECtric:D2?
Query Internal Diameter of the counter electrode (D2)
:ELECtric:T
Set Thickness of sample(t)
:ELECtric:T?
Query Thickness of sample(t)
:ELECtric:K
Set Electrode constant (K)
:ELECtric:K?
Query Electrode constant (K)
Comparator
:COMParator:LIMit
Set Comparator
:COMParator:LIMit?
Query Comparator
:COMParator:BEEPer
Set Comparator Beeper
:COMParator:BEEPer?
Query Comparator Beeper
Panel saving and loading
:PANel:SAVE
Set Panel saving
:PANel:SAVE?
Query already panel saving
:PANel:LOAD
Load panel data
:PANel:NAME
Set panel name
:PANel:NAME?
Query panel name
:PANel:CLEar
Delete panel data

12
category
command
function
Key Beeper
:KEY:BEEPer
Set Key Beeper
:KEY:BEEPer?
Query Key Beeper
Key-lock
:SYSTem:KLOCk
Set Key-Lock State
:SYSTem:KLOCk?
Query Key-Lock State
Internal memory
:MEMory?
Query measurement value in memory
:MEMory:RANGe?
Query measurement value in memory (range specification)
:MEMory:STATe
Set memory state
:MEMory:STATe?
Query memory state
:MEMory:COUNt?
Query number of measurement value
:MEMory:CLEar
Set Memory clear
D/A output function
:DAOutput
Set D/A output function
:DAOutput?
Query D/A output function
LCD
:DISPlay:MODE
Set Display Mode
:DISPlay:MODE?
Query Display Mode
:DISPlay:CONTrast
Set Contrast
:DISPlay:CONTrast?
Query Contrast
:DISPlay:BACKlight
Set Backlight
:DISPlay:BACKlight?
Query Backlight
Line Frequency
:SYSTem:LFRequency
Set Line Frequency
:SYSTem:LFRequency?
Query Line Frequency
:SYSTem:LFRequency:AUTO?
Query Automatic detection Line Frequency
Reset
Reset
Initialize Instrument (System Reset)
ExternalI/O
:IO:EDGE
Set Trigger edge
:IO:EDGE?
Query Trigger edge
:IO:FILTer:STATe
Set TRIG Signal's Filter
:IO:FILTer:STATe?
Query TRIG Signal's Filter
:IO:FILTer:TIME
Set TRIG Signal's Filter Tim
:IO:FILTer:TIME?
TRIG Signal's Filter Tim
:IO:EOM:MODE
Set EOM Output Method
:IO:EOM:MODE?
Query EOM Output Method
:IO:EOM:PULSe
Set EOM Pulse Width
:IO:EOM:PULSe?
Query EOM Pulse Width
:IO:OUTPin?
Query Output Pin Status
:IO:MODE?
Query NPN/PNP Switch Status
Device Event Status
Enable Register
:DSE
Set Device Event Status Enable Register
:DSE?
Query Device Event Status Enable Register
:DSR?
Query Device Event Status Register
:ERR?
Query error register
Command header
:HEADer
Set Header Presence
:HEADer?
Query Header Presence
Communication setting
:SYSTem:LOCal
Return to Local Control
:SYSTem:TERMinator
Set Delimiter
:SYSTem:TERMinator?
Query Delimiter

13
3 Message Reference
Message Reference Interpretation
< >: Indicates the contents (character or numeric parameters) of
the data portion of a message. Character parameters are
returned as all capital letters.
Numeric Parameters:
• NRf Number format may be any of NR1, NR2 and NR3
•NR1 Integer data (e.g.: +12, -23, 34)
•NR2 Fixed-point data (e.g.: +1.23, -23.45, 3.456)
•NR3 Floating-point exponential representation data
(e.g.: +1.0E-2, -2.3E+4)
Shows the command
description.
Shows the message
syntax.
Explains the command
data or response message.
Describes the message.
Shows an example of
an actual command
application. (Normally
described with HEADER OFF
[except the HEADER
command itself].)
Read/Write the Standard Event Status Enable Register (SESER)
Query
∗IDN?
Syntax
Command
*ESE <0 to255 (N R 1 ) >
Query
*ESE?
Response
<0 to255 (N R 1 )>
Description
Command
The SESER mask is set to the numerical value 0 to 255.
The initial value (at power-on) is 0.
Query
The contents of the SESER, as set by the *ESE
command, are returned as an NR1 value (0 to 255).
128
64
32
16
8
4
2
1
b i t 7
b i t 6
b i t 5
b i t 4
b i t 3
b i t 2
b i t 1
b i t 0
PON
URQ
CME
EXE
DDE
QYE
RQC
OPC
Example
*ESE 36
(Sets bits 5 and 2 of SESER)
Command, Query
Response
Controller
Instrument

14
Standard Commands
(1) System Data Command
Query Instrument ID (Identification Code)
Syntax
Query
*IDN?
Response
<Manufacturer name>,<Model name>,<Serial number>,<Software version>
Example
*IDN?
HIOKI, SM7420,123456789,V1.00
The Instrument ID is HIOKI SM71420, serial number 123456789, software version 1.00.
(2) Internal Operation Command
Execute Self-Test and Query Result
Syntax
Query
*TST?
Response
<0 to 1 (NR1)>
<0> = No error
<1> = ROM error
Description
Perform the instrument self-test and return the result as NR1 value 0 or 1.
Returns zero when no error occurs.
The response message has no header.
Example
*TST?
1
A ROM error occurred.
(3) Synchronization Commands
Set OPC bit of SESR when Finished with All Pending Operations
Syntax
Command
*OPC
Description
Sets OPC bit 0 of the Standard Event Status Register (SESR) when all commands prior
to *OPC have finished processing.
Example
A;B;*OPC;C
The OPC bit of SESR is set after A and B command processing has been completed.
Respond with ASCII “1” when Finished with All Pending Operations
Syntax
Query
*OPC?
Response
1
Description
Responds with ASCII “1” when all commands prior to * OPC have finished processing.
The response message has no header.
Initialize Instrument (Normal Reset)
Syntax
Command
*RST
Description
Command
Resets the instrument to factory settings excluding the communication state, ,
zero adjustment value and saved data.(Normal Reset)
The initial display is displayed after initialization.
Note
The communication state is not initialized.
Use the :RESet:SYSTem command to initialize the zero adjustment value
and saved data.

15
Wait for Pending Commands to Finish
Syntax
Command
*WAI
Description
The instrument waits until all prior commands finish before executing any subsequent
commands.
Example
:TRIGger EXTernal
*TRG;*WAI;MEASure?
Reads the measurement value after waiting for the measurement triggered by the *TRG
command to finish.
Note
The *WAI command is accepted, as it is a mandatory command under IEEE Standard
488.2-1987. However, since all the device-specific commands implemented in this
instrument, except the *TRG are sequential, the *WAI command has no effect even if
used.
(4) Status and Event Control Commands
Clear Event Register, Status Byte Register (Except Output Queue)
Syntax
Command
*CLS
Description
Clears the event status registers. The Status Byte Register bits corresponding to the
event status registers are also cleared. (STB, SESR, DESR)
Note
The output queue is unaffected.
Set and Query Standard Event Status Enable Register (SESER)
Syntax
Command
*ESE <0 to 255(N R 1 ) >
Query
*ESE?
Response
<0 to 255(N R 1 )>
Description
Command
The SESER mask is set to the numerical value 0 to 255. The initial value (at
power-on) is 0.
Query
The contents of the SESER, as set by the *ESE command, are returned as
an NR1 value (0 to 255).
128
64
32
16
8
4
2
1
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
PON
URQ
Unused
CME
EXE
DDE
QYE
RQC
Unused
OPC
Example
*ESE 32
Sets bit 5 of SESER.
Query and Clear Standard Event Status Register (SESR)
Syntax
Query
* ESR?
Response
<0 to255 (N R 1 )>
Description
Returns the contents of the SESR as an NR1 value from 0 to 255, then clears register
contents.
The response message has no header.
128
64
32
16
8
4
2
1
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
PON
URQ
Unused
CME
EXE
DDE
QYE
RQC
Unused
OPC
Example
* ESR?
32
Bit 5 of the SESR has been set to 1.

16
Set and Query Service Request Enable Register (SRER)
Syntax
Command
* SRE <0 to255 (N R 1 ) >
Query
* SRE?
Response
<0 to255 (N R 1 )>
Description
Command
The SRER mask is set to the numerical value 0 to 255.
Although NRf numerical values are accepted, values to the right of the
decimal are rounded to the nearest integer.
Bit 6 and unused bits 0, 1, 2 and 6 are ignored. The data is initialized to 0 at
power-on.
Query
The contents of the SRER, as set by the *SRE command, are returned as
an NR1 value (0 to 255). Bit 6 and unused bits 0, 1, 2 and 6 always return
as zero.
128
64
32
16
8
4
2
1
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
ERR
0
ESB
MAV
DSB
Unused
Unused
Unused
Example
* SRE 40
Set SRER bits 3 and 5 to 1.
* SRE?
40
SRER bits 3 and 5 have been set to 1.
Query Status Byte and MSS Bit
Syntax
Query
* STB?
Response
<0 to255 ( N R 1 ) >
Description
The contents of the STB are returned as an NR1 value (0 to 255).
The response message has no header.
128
64
32
16
8
4
2
1
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
ERR
MSS
ESB
MAV
DSB
Unused
Unused
Unused
Example
*STB?
1
STB bit 0 has been set to 1.
Request a Sample
Syntax
Command
*
TRG
Description
Performs one measurement when external triggering (:TRIGger EXTernal) is enabled.
Example
:TRIGger EXTernal
*TRG;MEASure?
Reads the measurement value after waiting for the measurement triggered by *TRG
command to finish.
Note
An execution error occurs when the trigger source is :TRIGger INTernal