I-tech It8500plus series User manual

IT8500+ Series Frame Format

Programmable DC Electronic Load

Models IT8500+

Ver1.1/MAR, 2008/8500-401

Directory

WARRANTY INFORMATION.................................................................................................................... 3

SAFETY SUMMARY ................................................................................................................................. 3

CHAPTER 1 REMOTE OPERATION MODE............................................................................................ 5

1.1 IT-E121 RS232 COMMUNICATION CABLE ..........................................................................5

1.2 IT-E122 USB COMMUNICATION CABLE..............................................................................5

CHAPTER 2 COMMUNICATION ORDER FOR IT8500+ ......................................................................... 5

FRAME FORMAT.....................................................................................................................5

COMMUNICATION PROTOCOL..................................................................................................9

Warranty Information

Certification

We certify that this product met its published specifications at time of shipment from the factory.

Warranty

This hardware product is warranted against defects in material and workmanship for a period of

ONE year from date of delivery. IT8500 series electronic load for use with a hardware product and

when properly installed on that hardware product, are warranted not to fail to execute their

programming instructions due to defects in material and workmanship for a period of 90 days from

date of delivery. During the warranty period our company will either repair or replace products which

prove to be defective. Our company does not warranty that the operation for the software firmware

or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a

service facility designated by our company. Customer shall prepay shipping charges by (and shall

pay all duty and taxes) for products returned to our place for warranty service. Our company shall

pay for return of products to Customer.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate

maintenance by the Customer, Customer-supplied software or interfacing, unauthorized

modification or misuse, operation outside of the environmental specifications for the product, or

improper site preparation and maintenance.

Assistance

The above statements apply only to the standard product warranty. Warranty options product

maintenance agreements and customer assistance agreements are also available.

Safety Summary

The following general safety precautions must be observed during all phases of operation of this

instrument. Failure to comply with these precautions or with specific warnings elsewhere in this

manual violates safety standards of design, manufacture, and intended use of the instrument .We

assumes no liability for the customer’s failure to comply with these requirements.

Environmental Conditions

This instrument is intended for indoor use. Pollution degree 2 environments. It is designed to

operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the

specifications tables for the ac mains voltage requirements and ambient operating temperature

range.

Before Applying Power

Verify that all safety precautions are taken. Note the instrument's external markings described under

"Safety Symbols".

Ground the Instrument

This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize

shock hazard, the instrument chassis and cover must be connected to an electrical ground. The

instrument must be connected to the ac power mains through a grounded power cable, with the

ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Note: Any

interruption of the protective (grounding) conductor or disconnection of the protective earth terminal

will cause a potential shock hazard that could result in personal injury.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of fumes or flammable gases.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must not remove instrument covers except as instructed in this Guide for

installing or removing electronic load modules. Component replacement and internal adjustments

must be made only by qualified service personnel. Do not replace components with power cable

connected. Under certain conditions dangerous voltages may exist even with the power cable

removed. To avoid injuries always disconnect power, discharge circuits, and remove external

voltage sources before touching components.

DO NOT SERVICE OR ADJUST ALONE

Do not try to do some internal service or adjustment unless another person capable of rendering

first aid resuscitation is present.

Safety Symbols

Direct current

Alternating current

Both direct and alternating current

Protective earth (ground) terminal

Caution (refer to accompanying documents)

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if

not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a

WARNING sign until the indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which,

if not correctly performed or adhered to, could result in damage to or destruction of part or all of the

WARNING

CAUTION

Chapter 1 Remote Operation Mode

DB9 in the rear panel of electronic load could connect with RS-232 through a TTL connector. The

following information may help you to know how to control the electronic load through PC.

1.1 IT-E121 RS232 Communication cable

The DB9 interface connector on the rear panel of electronic load is TTL level.You can use the

communication cable (IT-E121) to connect the DB9 interface with RS232 interface of PC.

1.2 IT-E122 USB Communication cable

The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use

the communication cable (IT-E132) to connect the DB9 interface with the USB interface of PC.

Chapter 2 Communication Order for IT8500+

Frame Format

Frame length is 26 bytes. Details as following:

AAH

Address

Command

4—25bytes are information content

Parity code

Description ：

1．Start bit is AAH，occupies one byte.

2．Address range from 0 to 31, occupies one byte. 0XFF is boardcast address.

3．Each command occupies one byte. Following is the command details.

20H

Set the Remote control mode

21H

Set the input on/off state

22H

Set the max input voltage

23H

Enquire the max setup input voltage.

24H

Set max input current

25H

Enquire the max setup input current.

26H

Set max input power.

27H

Enquire the max setup input power.

28H

Set CC/CV/CW/CR operation mode of electronic load.

29H

Enquire the operation mode.

2AH

Set CC mode current value

2BH

Enquire CC mode current value

2CH

Set CV mode voltage value

2DH

Enquire CV mode voltage value

2EH

Set CW mode watt value

2FH

Enquire CW mode watt value

30H

Set CR mode resistance value

31H

Enquire CR mode resistance value

32H

Set CC mode transient current and timer parameter.

33H

Enquire CC mode transient parameter

34H

Set CV mode transient voltage and timer parameter.

35H

Enquire CV mode transient parameter

36H

Set CW mode transient watt and timer parameter

37H

Enquire CW mode transient parameter

38H

Set CR mode transient resistance and timer parameter

39H

Enquire CR mode transient parameter

3AH

Set the list operation mode (CC )

3BH

Enquire the list operation mode.

3CH

Set the list repeat mode (ONCE / REPEAT)

3DH

Enquire the list repeat mode.

3EH

Set list steps counts.

3FH

Enquire list steps counts

40H

Set one of the step’s current and time values.

41H

Enquire one of the step’s current and time values.

4CH

Save list file in appointed area.

4DH

Recall the list file from the appointed area.

50H

Set timer value of FOR LOAD ON

51H

Enquire timer value of FOR LOAD ON

52H

Disable/Enable timer of FOR LOAD ON

53H

Enquire timer state of FOR LOAD ON

54H

Set communication address

55H

Enable/Disable LOCAL control button.

56H

Enable/Disable remote sense mode.

57H

Enquire the state of remote sense mode.

58H

Set trigger source.

59H

Enquire trigger source.

5AH

Sending a trigger signal to trigging the electronic load.

5BH

Saving user’s setting value in appointed memory area for recall.

5CH

Recall user’s setting value in appointed memory area.

5DH

Set function mode(FIXED/SHORT/TRAN/LIST/BATTERY).

5EH

Enquire function mode state.

5FH

enquire input voltage, current, power and relative state

01H

Get the information of E-Load(rated current/voltage,min voltage,max power,max

resistance,min resistance)

02H

Set hardware OPP point

03H

Enquire hardware OPP point

80H

Set software OCP point

81H

Enquire software OCP point

82H

Set OCP delay time

83H

Enquire OCP delay time

84H

Enable/disable OCP function

85H

Enquire the state of OCP function

86H

Set software OPP point

87H

Enquire software OPP point

88H

Set software OPP delay time

89H

Enquire software OPP delay time

8AH

Set the first measuring point

8BH

Enquire the first measuring point

8CH

Set the second measuring point

8DH

Enquire the second measuring point

8EH

Set Vd value of CR-LED mode

8FH

Enquire Vd value of CR-LED mode

90H

Clear the protection state

91H

Enable/disable voltage autorange function

92H

Enquire the state of voltage autorange

93H

Enable/disable CR-LED function

94H

Enquire the state of CR-LED mode

9DH

Provide a trigger signal,nomatter what the current trigger source it is.

A0H

Read related information of E-load(working time,the rest time of the timer)

A1H

Read related information of E-load(max input voltage and current,min input votage

and current)

A2H

Catch the max measuring voltage in list mode

A3H

Catch the min measuring voltage in list mode

A4H

Catch the max measuring current in list mode

A5H

Catch the min measuring current of E-load

A6H

enquire the capacitance

B0H

Set current rising slope

B1H

Enquire current rising slope

B2H

Set current falling slope

B3H

Enquire current falling slope

B4H

Set the voltage upper limit in CC mode

B5H

Enquire the voltage upper limit in CC mode

B6H

Set the voltage lower limit in CC mode

B7H

Enquire the voltage lower limit in CC mode

B8H

Set the current upper limit in CV mode

B9H

Enquire the current upper limit in CV mode

BAH

Set the current lower limit in CV mode

BBH

Enquire the current lower limit in CV mode

BCH

Set the voltage upper limit in CP mode

BDH

Enquire the voltage upper limit in CP mode

BEH

Set the voltage lower limit in CP mode

BFH

Enquire the voltage lower limit in CP mode

C0H

Set the max input resistance

C1H

Enquire the max input resistance

C2H

Set the voltage upper limit in CR mode

C3H

Enquire the voltage upper limit in CR mode

C4H

Set the voltage lower limit in CR mode

C5H

Enquire the voltage lower limit in CR mode

C6H

Set the current range in list mode

C7H

Enquire the current range in list mode

D0H

Set step counts of autotest file

D1H

Enquire step counts of autotest file

D2H

Set short steps

D3H

Read short steps

D4H

Set pause steps

D5H

Enquire pause steps

D6H

Set the on-load time of single step

D7H

Enquire the on-load time of single step

D8H

Set the delay time of single step

D9H

Enquire the delay time of single step

DAH

Set the no-load time of single step

DBH

Enquire the no-load time of single step

DCH

Set autotest stop condition

DDH

Enquire autotest stop condition

DEH

Set autotest chain file

DFH

Enquire autotest chain file

E0H

Save autotest file

E1H

Recall autotest file

0EH

Set Von mode

0FH

Enquire Von mode

10H

Set Von point

11H

Enquire Von point

If control output of electronic through PC, please setting electronic load to PC control state.

Command is 20H. Make a calibration on input of electronic Load, Ensure the calibration protection

mode is OFF state when setting calibration information.

If electronic load in calibration mode, user can’t change the input and operation mode of electronic

load.

4．From 4th byte to 25th byte are information contents.

5．26th is checksum code, is the sum of the former 25 bytes.

NOTE

Communication Protocol

1. Set control mode（20H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（20H）

4th .byte

Operation mode（0 is front panel operation mode ，1 is remote operation mode ）

From 5th to 25th byte

System reserve

26th byte

Sum code

Front panel operation state is not in effect if electronic load is in calibration mode.

2. Set the input on/off state （21H）

1st byte

Start bit ( AAH )

2nd byte

Address(0—31,0XFF)

3rd byte

Command（21H）

4th byte

Input state（0 is OFF，1is ON）

From 5th to 25th byte

System reserve

From26th byte

Sum code

3. Set / Read max input voltage（22H/23H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（22H/23H）

4th byte

The Lowest byte of max voltage value

5th byte

The lower byte of max voltage value.

6th byte

The higher byte of max voltage value.

7th byte

The highest byte of max voltage value.

From 8th to 25th byte

System reserve.

26th byte

Sum code.

Represent a voltage upper limit value by 4 bytes of Hex. Lower bytes are in the front location, higher

bytes are in the later location. 1 represent 1mV.For Example : The voltage upper limit is 16.000V，

the hex code is 0X00003E80，then the 4th byte is 0X80，5th byte is 0X3E，6th byte is 0X00，7TH

byte is 0X00.

NOTE

4. Set / Read the max input current .（24H/25H）

1st byte

Start bit ( AAH )

2nd byte

Address(0—31,0XFF)

3rd byte

Command（24H/25H）

4th byte

The Lowest byte of max current value

5th byte

The Lowest byte of max current value

6th byte

The higher byte of max current value

7th byte

The highest byte of max current value

From 8th to 25th byte

System reserve

26th bye

Sum code

Represent an current value by 4 bytes of Hex .Lower bytes are in the front location, higher

bytes are in the later location.1 represent 0.1mA,If setting upper limit is 3.0000A，the hex code

is 0X00007530，then the 4th byte is 0X30，5th is 0X75，6th is 0X00，7th is 0X00。

5. Set / Read max input power（26H/27H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—0XFE)

3rd byte

Command（26H/27H）

4th byte

The lowest byte of max power value.

5th byte

The lower byte of max power value

6th byte

The higher byte of max power value.

7th byte

The highest byte of max power value.

From 8th to 25th byte

System reserve

26th byte

Sum code

Represent power value by 4 bytes of Hex. Lower bytes are in the

Front location, higher bytes are in the later location. 1 represents 1mW. If setting upper value is

200.000W，the hex code is 0X00030d40，then the 4th byte is

0X40，5th is 0X0d，6th is 0X03，7th is 0X00.

6. Select / Read operation mode(CC/CV/CW/CR) of electronic load.（28H/29H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（28H/29H）

4th byte

Mode（0 is CC mode, 1 is CV mode , 2 is CW mode , 3 is CR mode ）

NOTE

From 5th to 25th byte

System reserve

26th byte

Sum code

7. Set / Read current value of CC mode（2AH/2BH）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command （2AH/2BH）

4th byte

The lowest byte of current value

5th byte

The lower byte of current value.

6th byte

The higher byte of current value.

7th byte

The highest byte of current value.

From 8th To 25th byte

System reserve

27th byte

Sum code

Represent current by 4 bytes of Hex. Lower bytes are in the front location, higher bytes are in

the later location. For example: current is 3.0000A，Hex code is 0X00007530，NO. 4 bye is

0X30，NO. 5 bye is 0X75，NO. 6 bye is 0X00，NO. 7 bye is 0X00。

8. Set / Read voltage value of CV mode.（2CH/2DH）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（2CH/2DH）

4th byte

The lowest byte of voltage value.

5th byte

The lower byte of voltage value.

6th byte

The higher byte of voltage value.

7th byte

The highest byte of voltage value.

From 8th to 25th byte

System reserve

26th byte

Sum code

Represent voltage by 4 bytes of Hex. Lower bytes are in the front location, higher bytes are in

the later location. For example :voltage is 16.000V，Hex code is 0X00003EB0，4th byte 0XB0，

5TH byte is 0X3E，6th byte is 0X00，7th bytes 0X00。

9. Set / Read watt value of CW mode（2EH/2FH）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

NOTE

3rd byte

Command（2EH/2FH）

4th byte

The lowest byte of max power value

5th byte

The lower byte of max power value

6th byte

The higher byte of max power value

7th byte

The highest byte of max power value

8th to 25th byte

System reserve

26th byte

Sum code

Represent power by 4 bytes of Hex. Lower bytes are in the front location, higher bytes are in

the later location. For example :power is 200.000W，Hex is 0X00030d40，4th byte is 0X40，

5th byte is 0X0d，6th byte is 0X03，7th byte is 0X00。

10. Set / Read resistance value CR mode（30H/31H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（30H/31H）

4th byte

The lowest byte of resistance value.

5th byte

The lower byte of resistance value.

6th byte

The higher byte of resistance value.

7th byte

The highest byte of resistance value.

8th to 25th byte

System reserve

26th byte

Sum code

Represent resistance value by 4 bytes of Hex. Lower bytes are

in the front location, higher bytes are in the later location. If resistance value is 200.000R，Hex

code is 0X00030d40，4TH byte is 0X40，5TH byte is 0X0d，6th byte is 0X03，7th byte is 0X00。

11. Set / Read CC mode transient current and timer parameter. （32H/33H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（32H/33H）

From 4th byte to 7th byte

Setting value of current A (Lower bytes are in the front location, higher bytes

are in the later location.)

From 8th byte to 9th byte.

Time value of timer A ((Lower bytes are in the front location, higher bytes are in

the later location) (1 represent 0.1mS)

From 10th to 13th byte

Setting value of current B (Lower bytes are in the front location, higher bytes

are in the later location)

NOTE

From 14th to 15th byte

Time value of timer B (Lower bytes are in the front location, higher bytes are in

the later location) (1 represent 0.1mS)

16th byte

Transition operation mode (0 is CONTINUES, 1 is PULSE, 2 is TOGGLED)

From 17th to 25th byte

System reserve

26th byte

Sum code

12. Set / Read CV transient voltage and timer parameter.（34H/35H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（34H/35H）

From 4th to 7th byte.

Setting value of voltage A (Lower bytes are in the front location, higher bytes

are in the later location)

From 8th to 9th byte.

Time value of timer A (Lower bytes are in the front location, higher bytes are in

the later location) (1represent 0.1mS)

From 10th to 13th byte

Setting value of voltage B(Lower bytes are in the front location, higher bytes are

in the later location)

From 14th to 15th byte

Time value of timer B (Lower bytes are in the front location, higher bytes are in

the later location) (1represent 0.1mS)

16th byte

Transient operation mode (0 is CONTINUES,1 is PULSE,2 is TOGGLED)

From 17th to 25th byte

System reserve

26th byte

Sum code

13. Set /Read CW transient watt and timer parameter（36H/37H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（36H/37H）

From 4th to 7th byte

Setting value of power A (Lower bytes are in the front location, higher bytes are

in the later location)

From 8th to 9th byte

Time value of timer A (Lower bytes are in the front location, higher bytes are in

the later location) (1 represent 0.1mS)

From 10th to 13th byte

Setting value of power B(Lower bytes are in the front location, higher bytes are

in the later location)

From 14th to 15th byte

Time value of timer B (Lower bytes are in the front location, higher bytes are in

the later location) (1 represent 0.1mS)

16th byte

Transition operation mode (0 is CONTINUES,1 is PULSE,2 is TOGGLED)

From 17th to 25th byte

System reserve

26th byte

Sum code

14. Set / Read CR transient resistance and timer parameter（38H/39H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（38H/39H）

From 4th byte to 7th byte

Setting value of resistance A (Lower bytes are in the front location, higher bytes

are in the later location)

From 8th byte to 9th byte.

Time value of timer A (Lower bytes are in the front location, higher bytes are in

the later location) (1 represents 0.1mS)

From 10th byte to 13th byte

Setting value of resistance B (Lower bytes are in the front location, higher bytes

are in the later location)

From 14th byte to 15th byte

Time value of timer B (Lower bytes are in the front location, higher bytes are in

the later location) (1 represents 0.1mS)

16th byte

Transition operation mode (0 is CONTINUES,1 is PULSE,2 is TOGGLED)

17th byte to 25th byte

System reserve

26th byte

Sum code

15．Set /Read the list operation mode (CC)（3AH/3BH）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（3AH/3BH）

4th byte

LIST operation mode（0 is CC mode）

From 5th to 25 byte

System reserve

26th byte

Sum code

16. Set / Read the list repeat mode. (3CH/3DH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（3CH/3DH）

4th byte

LIST repeat operation mode(0 is ONCE, 1 is REPEAT,65535 represents no limit)

From 5th to 25th byte

System reserve

26th byte

Sum code

17. Set / Read list step counts. (3EH/3FH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（3EH/3FH）

From 4th byte to 5th byte

LIST steps count

From 6th to 25th byte

System reserve

26th byte

Sum code

18. Set / Read one of the step’s current and time values. (40H/41H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（40H/41H）

From 4th byte to 5th byte

Appointed one step

From 6th to 9th byte

Current value of current step (Lower bytes are in the front location, higher bytes

are in the later location)

From 10th to 11th byte

Time value of current step (Lower bytes are in the front location, higher bytes are

in the later location) (1 represent 0.1mS)

From 12th to 25th byte

System reserve

26th byte

Sum code

19. Save / Recall list file in appointed area.. (4CH/4DH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（4CH/4DH）

4th byte

Storing area (1 ~ 7)

From 5th to 25th byte

System reserve

26th byte

Sum code

20. Setting / Reading timer value of FOR LOAD ON (50H/51H）

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（50H/51H）

4th byte

The lowest byte of time value in timer. (1 represent 1S)

5th byte

The highest byte of time value in timer.

From 8th to 25th byte

System reserve

26th byte

Sum code

Time unit in Timer is S, 1S is represented by 1.

21. Disable / Enable timer of FOR LOAD ON (52H);

Enquire timer state of FOR LOAD ON (53H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（52H/53H）

4th byte

Timer state (0:OFF,1:ON )

From 5th to 25th byte

System reserve

26th byte

Sum code

22. Set communication address (54H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—0XFE)

3rd byte

Command （54H）

4th byte

New communication address (0~31)

From 5th to 25th byte

System reserve

26th byte

Sum code

23. Enable/Disable LOCAL control mode. (55H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31)

3rd byte

Command（55H）

4th byte

State of LOCAL button(0:disable,1:enable “)

From 5th to 25th byte

System reserve

26th byte

Sum code

24. Enable / Disable remote sense mode. (56H)

Enquire the state of remote sense mode. (57H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（56H/57H）

4th byte

Remote mode state (0:OFF,1:ON)

5th to 25th byte

System reserve

26th byte

Sum code

25. Set / Enquire trigger source. (58H/59H)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command （58H/59H）

4th byte

Trigger mode (0:Manual,1: External,2:Bus,3:Hold)

From 5th to 25th byte

System reserve

26th byte

Sum code

26. Send a trigger signal to trigging the electronic load. (5AH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（5AH）

From 4th to 25th byte

System reserve

26th byte

Sum code

27. Saving / Recall user’s setting value in appointed memory area for recall.

(5BH/5CH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（5BH/5CH）

4th byte

Storing area

From 5th to 25th byte

System reserve

26th byte

Sum code

28. Selecting / Getting FIXED/SHORT/TRAN/LIST/ BATTERY function mode.

(5DH/5EH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command（5DH/5EH）

4th byte

Work mode (0:FIXED,1:SHORT, 2:TRANSITION,3:LIST,4: BATTERY)

From 5th to 25th byte

System reserve

26th byte

Sum code

29. Read input voltage, current, power and relative state. (5FH)

1st byte

Start bit ( AAH )

2nd byte

Address (0—31,0XFF)

3rd byte

Command （5FH）

From 4th to 7th byte

Actual input voltage value (Lower bytes are in the front location, higher bytes are

in the later location)

From 8th to 11th byte

Actual input current value (Lower bytes are in the front location, higher bytes are

in the later location)

From 12th to 15th byte

Actual input power value (Lower bytes are in the front location, higher bytes are

in the later location)

16th byte

Operation state register

From 17th to 18th byte

Demand state register

From 19th to 25th byte

System reserve

26th byte

Sum code

Operation status register

NO USE

LOT

SENSE

LOCAL

OUT

REM

WTG

CAL

FOR

LOAD

timer

status

Remote

sense

mode

LOCAL

button

state(0 is

disabled,1

enabled)

Load

input

state

remote

control

mode

Waitting

for a

trigger

signal

Load is in

calibration

mode

Enquire status register

Reverse voltage

Over voltage

Over current

Over power

Over temperature

remote sense wires are disconnected

Constant current

Constant voltage

Constant power

Constant resistance

PASS

Pass autotest

FAULT

fail to pass autotest

COMPLET

Complete autotest

Get the information of E-Load(rated max current,max voltage,min voltage,max

power,max resistance,min resistance). (01H)

1st byte

Start bit ( AAH )

2th byte

Address（0—31,0XFF)

3th byte

Command（01H）

From 4th to 7th byte

Rated max current (Lower bytes are in the former location, higher