HIOKI DT4250 Series Digital Multimeter User Manual

: June 9, 2024
: HIOKI

Table of Contents

Remote Interface Overview
Interface Parameters
About Command
Summary of Commands
Detail of Commands
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HIOKI E. E. CORPORATION
Aug. 2021
Revised edition 3
DT4250 series DIGITAL MULTIMETER Remote
Operation Manual

Remote Interface Overview

Step1. Connect the USB cable to the USB port on the computer.
Step2. Once the USB cable is connected and the USB driver is installed, a virtual COM port is created on the computer.

Interface Parameters

In order to operate the meter via a host computer or terminal, the parameters in interface within the DT4251,DT4252,DT4253,DT4254,DT4255,DT4256 have to match the parameters the serial interface provided by the host or terminal.
The following procedures will guide to set up interface parameters within these models.
Table.1

Item| Parameter|

Setting

---|---|---
1| Baud Rate| 9600 bps
2| Data Length| 8 bit
3| Parity Check| None
4| Stop Bit| 1 bit

About Command

3.1. Terminator
A terminator is a character sent by a host, which identified the end of a command string.
A valid terminator consists of two-byte data.

(Carriage Return, ASC(&H0D) ) (Line Feed, ASC(&H0A) ) **3.2. Return result** After execution of query command, digital multimeter will return the following format. \+ **3.3. Data Types ** Returned message is the ASCII string from the digital multimeter responding to a query. **Table.2**

Data Type| Explanation|

Example

---|---|---

Summary of Commands

Table.3

Command| Parameter|

Description

---|---|---
QPID| | Query the Meter model.
*IDN| | Query the Meter identification.
:SYST:RST| | Put the meter to reset.
:SYST:LLO| | Put the meter into the local lockout state.
:SYST:GTL| | Put the meter into the local state.
:CONF?| | Query the main function of the display.
:CONF2?| | Query the sub function of the display.
:CONF| <function,range>| Configure the range.
:FETCCNT?| | Query main measured count value.
:FETCCNT2?| | Query sub measured count value.
:CALC:STAT:MAX?| | Query measured maximum count value.
:CALC:STAT:MIN?| | Query measured minimum count value.
:CALC:STAT: AVER?| | Query measured average count value.
:CALC:REL:OFFS?| | Query the offset value of the relative.
:SYST:APS| <0|1>| Set the APS.
:SYST:BEEP| <0|1>| Set the action of the beeper.
:SYST:BLIT| <0|1>| Set the backlight.
:SYST:BLA| <0|1>| Set the auto backlight.
:SYST:BATT?| | Query the battery level.
:SYST:REL| <0|1>| Set the relative.
:SYST:FILTER| <0|1>,<100|500>| Set the filter.
:MEAS:AUTOV?| | Query the status DC or AC of AutoV function.
:SYST:INIT| | Put the meter to power-on-reset state.
:STAT?| | Query the status of the meter.

Detail of Commands

5.1. Description of Commands
The DT4251,DT4252,DT4253,DT4254,DT4255,DT4256 only accepts the UPPERCASE command. (Except Unit etc.)
Table.4

Command|

Explanation

---|---
QPID| Query the Meter model. Syntax QPID Response “DT4251” or “DT4252” or “DT4253” or ”DT4254” or “DT4255” or “DT4256”
IDN| Query the Meter identification. Syntax IDN?
Response <data×3>

maker name, model number, serial, version Example; “HIOKI,DT4251,130501234,Ver 1.00” :SYST:RST| Put the meter to reset. Syntax :SYST:RST Response “OK” :SYST:LLO| Put the meter into the local lockout state. Syntax :SYST:LLO Response “OK” :SYST:GTL| Put the meter into the local state. Syntax :SYST:GTL Response “OK” :CONF? :CONF2?| Query the function of the display. Syntax :CONF? [:CONF2?] Response function,range Example; “ACV, 600m” → 5.2 Combination response string function and range :CONF| Configure the range. Syntax :CONF function,range Example; “:CONF RES, 60k” →5.2 Combination response string function and range Response “OK” or “CMD ERR” or “EXE ERR” :FETCCNT? :FETCCNT2?| Query measured count value. Syntax :FETCCNT? [:FETCCNT2?] Response count value Example; “3000” ---|--- :CALC:STAT:MAX?| Query measured maximum count value. (1) Syntax :CALC:STAT:MAX? Response count value Example; “5000” :CALC:STAT:MIN?| Query measured minimum count value. (1) Syntax :CALC:STAT:MIN? Response count value Example; “2000” :CALC:STAT:AVER?| Query measured average count value. (1) Syntax :CALC:STAT: AVER? Response count value Example; “3500” :CALC:REL:OFFS?| Query the offset value of the relative. Syntax :CALC:REL:OFFS? Response offset value, range Example; “20, 600m” :SYST:APS| Set the APS. Syntax :SYST:APS “0” (off) or“1” (on) Example; “:SYST:APS 1” Response “OK” or “CMD ERR” :SYST:BEEP| Set the action of the beeper. Syntax :SYST:BEEP “0” (off) or “1” (on) Example; “:SYST:BEEP 1” Response “OK” or “CMD ERR”

(1) Since the internal count value is returned, the value beyond the display range is not guaranteed to be accurate.

:SYST:BLIT| Set the backlight.
Syntax :SYST:BLIT <data×1>

“0” (off) or “1” (on) Example; “:SYST:BLIT 1” Response “OK” or “CMD ERR” ---|--- :SYST:BLA| Set the auto backlight. Syntax :SYST: BLA “0” (off) or “1” (on) Example; “:SYST: BLA 1” Response “OK” or “CMD ERR” :SYST:BATT?| Query the battery level. Syntax :SYST:BATT? Response Four steps remaining battery level. “3” or “2” or “1” or “0” :SYST:REL| Set the relative. Syntax :SYST: REL “0” (off) or “1” (on) Example; “:SYST: REL 1” Response “OK” or “CMD ERR” :SYST:FILTER| Set the filter. Syntax :SYST: FILTER “0” (off) or “1” (on) “100” (100Hz) or “500” (500Hz) Example; “:SYST: FILTER 1,100” Response “OK” or “CMD ERR” :MEAS:AUTOV?| Query the status DC or AC of AutoV function. Syntax :MEAS: AUTOV? Response “0” (DC) or “1” (AC) or “EXE ERR” (Other than AutoV function) :SYST:INIT| Put the meter to power-on-reset state. Syntax :SYST: INIT Response “OK” :STAT?| Query the status of the meter. Syntax :STAT?

Response “” (24char)

| A—Recording| “0”(OFF)
or “1”(MAX) or “2”(MIN) or “3”(AVG)
---|---
B—Relative value (REL)| “0”(OFF) or “1”(ON)
C—Filter| “0”(OFF) or “1”(ON)
D—Beep| “0”(OFF) or “1”(ON)
E—APS| “0”(OFF) or “1”(ON)
F—Battery level| “0”～“3”
G—Input warning| “0”(normal) or “1”(warn)
HI—Rotary position| “00”～“99”(from OFF)
J—HOLD| “0”(OFF) or “1”(ON)
K—Auto Hold| “0”(OFF) or “1”(ON)
L—Auto Range| “0”(OFF) or “1”(ON)
M—Backlight| “0”(OFF) or “1”(ON)
N—Backlight Auto OFF| “0”(OFF) or “1”(ON)
O—Filter Cut-off frequency| “0”(100Hz) or “1”(500Hz)
P—reserved| “0”
Q— reserved| “0”
R— reserved| “0”
S— reserved| “0”
T— reserved| “0”
U— reserved| “0”
V— reserved| “0”
W—reserved| “0” or “1”
X—reserved| “0”

5.2. Combination response string function and range
Table.5

Function

|

Range

---|---
ACV| 6, 60, 600, 1000
DCV| 600m（※1）, 6, 60, 600, 1000
DCmV| 600m
AutoV| 600
CONT| 600
RES| 600, 6k, 60k, 600k, 6M, 60M
CAP| 1u, 10u, 100u, 1m, 10m
DIODE| 1500
TEMP| 400
CLAMP| 10, 20, 50, 100, 200, 500, 1000
ACA| 600m（※2）, 6, 10
DCA| 60m（※3）, 600m（※4）, 6, 10
DCmA| 6m, 60m
DCuA| 60u, 600u
VDET| 0 (Lo, Hi) （※5）
FREQ| 100, 1k, 10k, 100k

（※1）600mV range is for DT4251 or DT4253 or DT4254 or DT4255 or DT4256.
（※2）600mA range is only DT4256
（※3）60mA range is only DT4256
（※4）600mA range is only DT4256
（※5）1 is for DT4254 or DT4255 or DT4256
5.3. Count value of abnormal data
Response of count value query return the values shown in Table.6 in the case of abnormal data.
Table.6

Type of abnormal value	Count value
Over Range value	1000000
Invalid data	2000000
Open value (DT4253, TEMP function)	3000000
Internal error value (DT4253, TEMP function)	4000000

6. Compatible command with earlier products
Table.7 shows the command compatibility with earlier products 3800 series.
Table.7

Command	Description
*CLS	Clear the system Error Queue.
*RST	Put the meter to power-on-reset state.
LLO	Put the meter into the local lockout state when in remote control. This

means no local key operation at the front panel is allowed during remote control.
GTL| Put the meter into the local state, clearing the remote state and front panel lockout.
FETC? [@2]| Return the primary or secondary function value of output butter.
Response：

Please note
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