ICPDAS Network Device I-7011, I-7011D, I-7011P, I-7011PD, I-7018 User Manual

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I-7011, I-7018 User ManualRev:B1.0

Warranty

All products manufactured by ICP DAS are warranted
against defective materials for a period of one year from the date
of delivery to the original purchaser.

Warning

ICP DAS assume no liability for damages consequent to
the use of this product. ICP DAS reserves the right to change this
manual at any time without notice. The information furnished by
ICP DAS is believed to be accurate and reliable. However, no re­sponsibility is assumed by ICP DAS for its use, nor for a ny infringe­ments of patents or other rights of third parties resulting from its
use.

Copyright

Copyright 1999 by ICP DAS. All rights are reserved.

Trade mark

The names used for identification only maybe registered
trademarks of their respective companies.

I-7011/11D, I-7011P/11PD,

I-7018, I-7018P

User M anual

Date:1999-10

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I-7011, I-7018 User Manual Rev:B1.0

Ta ble of Contents

1. Introduction .....................................................5

1.1 More Information.......................................5

1.2 Pin Assignment ..........................................6

1.3 Specifications ............................................ 8

1.4 Block Diagram......................................... 11

1.5 Wire Connection......................................1 2

1.6 Quick Start .............................................. 14

1.7 Default Setting.........................................14

1.8 Jumper Setting.........................................1 4

1.9 Calibration ...............................................15

1.10 Configuration Tables ............................. 16

2. Comma nd.......................................................20

2.1 %AANNTTCCFF ...................................22

2.2 #** ........................................................... 23

2.3 #AA ......................................................... 24

2.4 #AAN ......................................................25

2.5 $AA0 ....................................................... 26

2.6 $AA1 ....................................................... 27

2.7 $AA2 ....................................................... 28

2.8 $AA3 ....................................................... 29

2.9 $AA4 ....................................................... 30

2.10 $AA5VV ...............................................31

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2.11 $AA6 .....................................................32

2.12 $AA8 .....................................................33

2.13 $AA8V ..................................................34

2.14 $AA9(Data) ...........................................35

2.15 $AAB ....................................................36

2.16 $AAF.....................................................37

2.17 $AAM....................................................38

2.18 $AAZ(Data) ..........................................39

2.19 ~AAO(Data) ..........................................40

2.20 ~AAEV ..................................................41

2.21 @AADI.................................................. 4 2

2.22 @AADO(Data) ......................................44

2.23 @AAEAT ..............................................45

2.24 @AAHI(Data) ....................................... 4 6

2.25 @AALO(Data)......................................47

2.26 @AADA................................................ 48

2.27 @AACA................................................49

2.28 @AARH................................................50

2.29 @AARL ................................................51

2.30 @AARE ................................................52

2.31 @AACE ................................................53

2.32 ~**......................................................... 54

2.33 ~AA0.....................................................55

2.34 ~AA1.....................................................56

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2.35 ~AA2.....................................................57

2.36 ~AA3EVV .............................................58

2.37 ~AA4.....................................................59

2.38 ~AA5PPSS ............................................60

3. Application Note ............................................61

3.1 INIT* pin Operation ................................61

3.2 Module Status .......................................... 6 1

3.3 Dual Watchdog Operation .......................62

3.4 Digital Input and Event Counter.............. 6 2

3.5 Digital Output..........................................62

3.6 High/Low Alarm......................................63

3.7 Thermocouple Measurement ...................63

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1. Introduction

I-7000 is a family of network data acquisition and control
modules. They provide analog-to-digital, digital-to-a nalog, digital
input/output, timer/counter a nd other functions. These modules ca n
be remote controlled by a set of commands. The common features
of I-7011/11D/1 1P/11PD/18/18P are given as following :

z 3000V DC Isolated analog input
z 24-bits sigma-delta ADC to provide excellent accuracy
z Thermocouple direct connect with build-in CJC
z Software calibration

The I-701 1 is a single cha nnel a nalog input module. The I­7011D is the I-701 1 with a 4½ digit LED display . The I-7018 is a 8­channel analog input module. The I-7011P/11PD/18P is the en­ha nced version of I-7011/11D/18. The I-701 1P/1 1PD/18P support
more thermocouple types a nd enha nced the mea sure ra nge of some
types.

1.1 More Inf ormation

Ref er to “I-7000 Bus Converter User M a nual” chapter 1
for more information a s following:

1.1 I-7000 Overview

1.2 I-7000 Related Documentation

1.3 I-7000 Comma nd Featur es

1.4 I-7000 System Network Configuration

1.5 I-7000 Dimension

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1.2 Pin Assignment

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1.3 Specifications

I-7011/I-7011D

Analog Input

Input Channel : 1
Input Type :

mV, V, mA(with external

125 ohms resistor)

Thermocouple : Type J, K,

T, E, R, S, B, N, C

Sampling Rate :

10 Sample s/Second
Bandwidth : 5.24 Hz
Accuracy : ±0.05%
Zero Drift : 0.5µV/°C
Span Drift : 25ppm/°C
CM R@50/60Hz : 150dB
NM R@50/60Hz : 100dB
Input Impedance : 20M Ohms
Isolation : 3000V DC

Digital Output

2 channel
Open Collector to 30V
Output Load : sink 30mA max
Power Dissi pation : 300mW

Digital Input

1 channel

Logic Level 0 : +1V max
Logic Level 1 : +3.5 to 30V

Event Counter

M ax Input Frequency : 50 Hz
M in. Pulse Width : 1 mS

Displayed LED

4½ digits (for I-7011D)

Power Supply

Input : +10 to +30 VDC
Consumption :

0.9W for I-7011

1.5W for I-7011D

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I-7011P/I-7011PD

Analog Input

Input Channel : 1
Input Type :

mV, V, mA(with external

125 ohms resistor)

Thermocouple : Type J, K,

T, E, R, S, B, N, C, L, M

Sampling Rate :

10 Samples/Second
Bandwidth : 5.24 Hz
Accuracy : ±0.05%
Zero Drift : 0.5µV/°C
Span Drift : 25ppm/°C
CM R@50/60Hz : 150dB
NM R@50/60Hz : 100dB
Input Impedance : 20M Ohms
Isolation : 3000V DC

Digital Output

2 channel
Open Collector to 30V
Output Load : sink 30mA max
Power Dissi pation : 300mW

Digital Input

1 channel

Logic Level 0 : +1V max
Logic Level 1 : +3.5 to 30V

Event Counter

Max Input Frequency : 50 Hz
Min. Pulse W idth : 1 mS

Displayed LED

4½ digits (for I-7011PD)

Power Supply

Input : +10 to +30 VDC
Consumption :

0.9W for I-7011P

1.5W for I-7011PD

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I-7018

Analog Input

Input Channel :

8 differenti al or 6 dif f eren­tial and 2 single-ended.
Jumper select.

Input Type :

mV, V, mA(with external
125 ohms resistor)

Thermocouple : Type J, K,
T, E, R, S, B, N, C

Sampling Rate :

10 Sample s/Second

Bandwidth : 15.7 Hz
Accuracy : ±0.1%
Zero Drift : 0.5µV/°C
Span Drift : 25ppm/°C
CM R@50/60Hz : 150dB
NM R@50/60Hz : 100dB
Input Impedance : 20M Ohms
Overvoltage Protection : ±35V
Isolation : 3000V DC

Power Supply

Input : +10 to +30 VDC
Consumption : 1.0W

I-7018P

Analog Input

Input Channel :

8 differenti al or 6 dif f eren­tial and 2 single-ended.
Jumper select.

Analog Input Type :

mV, V, mA(with external
125 ohms resistor)

Thermocouple : Type J, K,
T, E, R, S, B, N, C, L, M

Sampling Rate :

10 Sa mples/Second

Bandwidth : 15.7 Hz
Accuracy : ±0.1%
Zero Drift : 0.5µV/°C
Span Drift : 25ppm/°C
CM R@50/60Hz : 150dB
NM R@50/60Hz : 100dB
Input Impedance : 20M Ohms
Overvoltage Protection : ±35V
Isolation : 3000V DC

Power Supply

Input : +10 to +30 VDC
Consumption : 1.0W

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1.4 Block Diagram

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I-7018/18P Analog Input Chan­nel 0 to 5 Wire Connection

1.5 Wire Connection

I-7011/11D/11P/11PD Analog

Input Wire Connection

I-7011/11D/11P/11PD Digital
Input Wire Connection

I-7011/11D/11P/11PD Digital
Output Wire Connection

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I-7018/18P Analog Input Chan­nel 6 and 7 Wire Connection,
while the jumper JP1 setting is 8
differential mode.

I-7018/18P Analog Input Chan­nel 6 and 7 Wire Connection,
while the jumper JP1 setting is
INIT* mode.

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1.6 Quick Start

Ref er to “I-7000 Bus Converter User Ma nual” and “Get-

ting Start” for more detail.

1.7 Default Setting

Default setting for I-7011/11D/11P/11PD/18/18P :

z Address : 01
z Analog Input Type : Type 05, -2.5 to +2.5 V
z Baudrate : 9600 bps
z Checksum disable, 60Hz rejection, engineer unit format
z I-7018/18P set as INIT* mode, and the analog input is 6 dif-

ferenti al and 2 single-ended.

1.8 Jumper Setting

I-7018/18P : Jumper JP1 for select the pin INIT*/Vin 7­Select 8 differential mode, the pin INIT*/V in7- is set to Vin7-

Select INIT* mode, the pin INIT*/Vin7- is set to INIT*

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1.9 Calibration

Don’t Perform Calibrate Until You Really Understand.

Calibration Requirement for I-7011/11D/11P/11PD/18/18P

Notification :
1 While calibrate type 06, need connect external shunt resistor ,

125 ohms, 0.1% (Ref Sec.1.5).

2 Connect calibration voltage(or current) signal to module’s

input. For I-7018/18P, connect to channel 0. (Wire connect ref

Sec.1.5)

3 Before calibration, warm-up module a bout 30 minutes for bet-

ter accuracy.
Example Calibration Sequence f or Type 00 :
1 Setting Type to 00 -> Ref

Sec.2.1.

2 Enable Calibration -> Ref

Sec.2.20.

3 Apply Zero Calibration Voltage (0mV)
4 Preform Zero Calibration Command -> Ref Sec.2.6.
5 Apply Span Calibration Voltage (15mV)
6 Perform Span Calibration Comma nd -> Ref Sec.2.5.
7 Repeat step1 to step6 three times.
Calibration sequence for other type is si mili ar but diff erent in step
1 to set different type.

Type Code 00 01 02 03 04 05 06

Min. Input 0 mV 0 mV 0 mV 0 mV 0 V 0 V 0 mA

Max Inp ut

+15

mV

+50

mV

+100

mV

+500

mV

+1 V +2.5 V

+20

mA

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1.10 Configuration Tables

Configuration Table of I-7011/11D/11P/11PD/18/18P :

Baudrate Setting (CC)

Analog Input Type Setting (TT)

T.C Type L and M for I-7011P/11PD/18P only.

Data Format Setting (FF)

*1 : Filter Select : 0 = 60Hz rejection

1 = 50Hz rejection
*2 : Checksum Bit : 0=Disable, 1=Enable
*3 : 00 = Engineer Unit Format

01 = Percent Format
10 = 2’s Complement HEX Format

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Type

Code

Input Ra nge D at a F o rmat + F. S. Zero - F.S .

00

-1 5 to +15
mV

Engineer Unit +15.000 +00.000 -15.000

% of FS R +100.00 +000.00 - 100.00

2's complement HEX 7FFF 0000 8000

01

-50 to +50
mV

Engineer Unit +50.000 +00.000 -50.000

% of FS R +100.00 +000.00 - 100.00

2's complement HEX 7FFF 0000 8000

02

-100 to +100
mV

Engineer Unit +100.00 +000.00 -100.00

% of FS R +100.00 +000.00 - 100.00

2's complement HEX 7FFF 0000 8000

03

-500 to +500
mV

Engineer Unit +500.00 +000.00 -500.00

% of FS R +100.00 +000.00 - 100.00

2's complement HEX 7FFF 0000 8000

Engineer Unit +1.0000 +0.0000 -1.0000

Analog input type and data format table

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Type

Code

Input Ra nge D ata F o rmat + F. S. Ze ro -F.S.

16

C Type

0 to 2320

degree C elsius

Engineer Unit +2320.0 +00.000 +00.000

% of FS R +100.00 +000.00 +000.00

2's complement HEX 7F FF 0000 0000

17

*1

L Typ e

-200 to 800

degree C elsius

Engineer Unit +800.00 +00.000 -200.00

% of FS R +100.00 +000.00 - 025.00

2's complement HEX 7F FF 0000 E000

18

*1

M Type

-200 to 100

degree C elsius

Engineer Unit +100.00 +000.00 -200.00

% of FS R +050.00 +000.00 - 100.00

2's complement HEX 4000 0000 8000

*1

: Only available for I-7011P, I-7011PD and I- 7018P

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2. Command

Comma nd Format : (Leading)(Address)(Command)[CHK](cr)
Response Format : (Leading)(Address)(Data)[CHK](cr)

[CHK] 2-character checksum
(cr) end-of-command character, character return(0x0D)

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Ge ne ra l Comma nd Sets (Continue d)

~AAO (Data) !AA Set Mod ule N ame Sec.2.19
~A A E V ! A A En able /D is able Calibr at ion Sec.2.20

Dig ital Input/Output, Alarm a nd Eve nt Counte r Co mmand Se ts

@AADI !AASOOII

Read Digital I/O and
Alarm Status

Sec.2.21

@AADO (Da ta) !AA Se t Digital Output Sec.2.22
@AAEAT ! AA Enable Alar m Sec.2.23
@AAHI(Data) !AA Set High Alarm Sec.2.24
@ AALO (Da ta ) !AA S e t Lo w Ala rm Sec.2.25
@AADA !AA Disable Ala rm Sec.2.26
@AAC A !AA C lear Latc h Ala rm Sec.2.27

@AARH !AA(Data ) Read High Ala rm Sec.2.28
@AARL !AA(Data ) Read Low Ala rm Sec.2.29

@AARE !AA(Data) Read Event Counter Sec.2.30

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2.1 %AANNTTCCFF

Description : Set module Configuration
Syntax : %AANNTTCCFF[CHK](cr)

% a delimiter character
AA address of setting module(00 to FF)
NN new address for setting module(00 to FF)
TT new type for setting module (Ref Sec.1.10)
CC new baudrate for setting module (Ref Sec.1.10)
FF new data format for setting module (Ref Sec.1.10)

When changing the baudrate or checksum, it is neces-

sary to short the pin INIT* to ground.

Response : V alid Comma nd : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command. While change baudrate

or checksum setting without shorting INIT* to ground, the
module will return invalid comma nd.

AA address of response module(00 to FF)
Example :
Command : %0102050600 Receive : !02

Change address from 01 to 02, return success.

Related Comma nd :
Sec.2.7 $AA2
Related Topics :
Sec.1.10 Configuration Tables, Sec.3.1 INIT* pin Operation

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2.2 #**

Description : Synchronized Sampling
Syntax : #**[CHK](cr)

# a delimiter character
** synchronized sampling command

Response : No response
Example :

Comma nd : $014 Receive : ?01

Read synchronized sampling data, return no data valid.

Comma nd : #** No response

Send synchronized sampling comma nd.

Comma nd : $014 Receive : >011+025.123

First read, get status=1, first read.

Comma nd : $014 Receive : >010+025.123

Second read, get status=0, have readed.

Related Comma nd :
Sec.2.9 $AA4
Note : The command is for I-7011/11D/11P/11PD only

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2.3 #AA

Description : Read Analog Input
Syntax : #AA[CHK](cr)

# delimiter character
AA address of reading module(00 to FF)
Response : V alid Command : >(Data)[CHK](cr)

Syntax error or communication error may get no re-

sponse.
> delimiter f or valid command
(Data) analog input value, reference Sec.1.10 for its format.

For I-7018/18P, the data is the combination for ea ch chan­nel respectively.

Example :
Comma nd : #01 Receive : >+02.635

Read address 01, return data success.

Comma nd : #02 Receive : >4C53

Read address 02, return data in HEX format success.
Comma nd : #04
Receive : >+05.123+04.153+07.234-02.356+10.000-

05.133+02.345+08.234
Module a ddress 04 is I-7018. Rea d a ddress 04, get a nalog input
data of 8 channels.

Related Comma nd :
Sec.2.1 %AANNTTCCFF, Sec.2.7 $AA2
Related Topics :
Sec.1.10 Configuration Tables

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2.4 #AAN

Description : Read Analog Input from channel N
Syntax : #AAN[CHK](cr)

# delimiter character
AA address of reading module (00 to FF)
N channel to read, from 0 to 7
Response : V alid Command : >(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
> delimiter f or valid comma nd
? deli miter for invalid comma nd
AA address of response module(00 to FF)
(Data) analog input value, reference Sec.1.10 for its format
Example :
Comma nd : #032 Receive : >+02.513

Read address 03 channel 2, get data success.

Comma nd : #029 Receive : ?02

Read address 02 channel 9, return error channel number.

Related Comma nd :
Sec.2.1 %AANNTTCCFF, Sec.2.7 $AA2
Related Topics :
Sec.1.10 Configuration Tables
Note : The command is for I-7018/18P only

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2.5 $AA0

Description : Perform Span Calibration
Syntax : $AA0[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
0 command for performing span calibration
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command or the calibration is not

enabled

AA address of response module(00 to FF)
Example :
Comma nd : $010 Receive : !01

Perform address 01 span calibration, return success.

Comma nd : $020 Receive : ?02

Perform address 02 span calibration, return the calibration is

not enabled before perform calibration command.

Related Comma nd :
Sec.2.6 $AA1, Sec.2.20 ~AAEV
Related Topics :
Sec.1.9 Calibration

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2.6 $AA1

Description : Perform Zero Calibration
Syntax : $AA1[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
1 command for performing zero calibration
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command or the calibration is not

enabled

AA address of response module(00 to FF)
Example :
Comma nd : $01 1 Receive : !01

Perform address 01 zero calibration, return success.

Comma nd : $021 Receive : ?02

Perform address 02 zero calibration, return the calibration is

not enabled before perform calibration command.

Related Comma nd :
Sec.2.5 $AA0, Sec.2.20 ~AAEV
Related Topics :
Sec.1.9 Calibration

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2.7 $AA2

Description : Read Configuration
Syntax : $AA2[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
2 command for reading configuration

Response : V alid Command :
!AATTCCFF[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
TT type code of module (reference Sec.1.10)
CC baudrate code of module (reference Sec.1.10)
FF data format of module (reference Sec.1.10)
Example :
Comma nd : $012 Receive : !01050600

Read address 01 configuration, return success.

Comma nd : $022 Receive : !02030602

Read address 02 configuration, return success.

Related Comma nd :
Sec2.1 %AANNTTCCFF
Related Topics :
Sec.1.10 Configuration Tables, Sec.3.1 INIT* pin Operation

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2.8 $AA3

Description : Read CJC Temperature
Syntax : $AA3[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
3 command for reading CJC temperature
Response : V alid Command : >(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
> delimiter f or valid comma nd
? deli miter for invalid comma nd
AA address of response module(00 to FF)
(Data) CJC temperature in degree Celsius.
Example :
Comma nd : $033 Receive : >+0025.4

Read address 03 CJC temperature, return 25.4°C.

Related Comma nd :
Sec.2.14 $AA9(Data)

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2.9 $AA4

Description : Read Synchronized Data
Syntax : $AA4[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
4 command for rea ding synchronized data
Response : V alid Command : >AAS(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command or the module does not

receive command #** before the command $AA4.
AA address of response module(00 to FF)
S status of synchronized data, 1 = first time reading, 0 =

has been readed
(Data) synchronized data, format reference Sec.1.10
Example :
See example of Sec.2.2 #**
Related Comma nd :
Sec.2.2 #**
Note : The command is for I-7011/11D/11P/11PD only

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2.10 $AA5VV

Description : Set Channel Enable
Syntax : $AA5VV[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
5 command for settting channel enable
VV channel enable/disable, 00 is all disabled, and FF is all

enabled.

Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Comma nd : $0155A Receive : !01

Set address 01 enable channel 1,3,4,6 and disable channel

0,2,5,7, return success.

Comma nd : $016 Receive : !015A

Rea d address 01 cha nnel status, return channel 1,3,4,6 enable

and channel 0,2,5,7 disable.

Related Comma nd :
Sec.2.11 $AA6
Note : The command is for I-7018/18P only

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2.11 $AA6

Description : Read Channel Status
Syntax : $AA6[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
6 command for reading channel status
Response : V alid Command : !AAVV[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
VV channel enable/disable, 00 is all disabled, and FF is all

enabled.

Example :
Comma nd : $015A5 Receive : !01

Set address 01 enable channel 0,2,5,7 and disable channel

1,3,4,6 , return success.

Comma nd : $016 Receive : !01A5

Rea d address 01 cha nnel status, return channel 0,2,5,7 enable

and channel 1,3,4,6 disable.

Related Comma nd :
Sec2.10 $AA5VV
Note : The command is for I-7018/18P only

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2.12 $AA8

Description : Read LED Configuration
Syntax : $AA8[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
8 command for setting LED configuration
Response : V alid Command : !AAV[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
V LED configuration

1=module control, 2=host control

Example :
Comma nd : $018 Receive : !011

Read address 01 LED configuration, return module control.

Comma nd : $028 Receive : !012

Read address 02 LED configuration, return host control.

Related Comma nd :
Sec2.13 $AA8V, Sec2.18 $AAZ(Data)
Note : The command is for I-7011D/11PD only

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2.13 $AA8V

Description : Set LED Configuration
Syntax : $AA8V[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
8 command for setting LED configuration
V 1=Set LED to module, 2=Set LED to host
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : $0182 Receive : !01

Set address 01 LED to host control, return success.

Comma nd : $0281 Receive : !02

Set address 02 LED to module control, return success.

Related Comma nd :
Sec2.12 $AA8, Sec2.18 $AAZ(Data)
Note : The command is for I-7011D/11PD only

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2.14 $AA9(Data)

Description : Set CJC Offset Value
Syntax : $AA9(Data)[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
9 command for setting CJC offset value
(Data) CJC offset value comprises a sign and 4 hexadecimal

digits, from -1000 to +1000, each count is 0.01°C.

Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module (00 to FF)
Example :
Command : $019+0010 Rece ive : !01

Set address 01 CJC offset increase 16 counts (+0.16°C), re-

turn success.

Related Comma nd :
Sec.2.8 $AA3

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2.15 $AAB

Description : Thremocouple Open Detection
Syntax : $AAB[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
B command for reading thremocouple open status
Response : V alid Command : !AAS[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
S 0=close-loop detection

1=open-circuit detection, need to check the thermocouple

Example :
Comma nd : $01B Receive : !010

Rea d address 01 thermocouple open status, return the thermo­couple is close-loop.

Note : The command is for I-7011/11D/11P/11PD only

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2.16 $AAF

Description : Rea d Firmware Version
Syntax : $AAF[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
F comma nd f or reading firmware version
Response : V alid Command : !AA(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
(Data) firmware version of module
Example :
Comma nd : $01F Rece ive : !01A2.0

Read address 01 firmware version, return version A2.0.

Comma nd : $02F Rece ive : !01B1.1

Read address 02 firmware version, return version B1.1.

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2.17 $AAM

Description : Read Module Name
Syntax : $AAM[CHK](cr)

$ delimiter character
AA address of reading module (00 to FF)
M command for reading module name
Response : V alid Command : !AA(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
(Data) Name of module
Example :
Comma nd : $01M Receive : !017018

Read address 01 module name, return name 7018.

Comma nd : $03M Receive : !037011D

Read address 03 module name, return name 7011D.

Related Comma nd :
Sec.2.19 ~AAO(Data)

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2.18 $AAZ(Data)

Description : Set LED Data
Syntax : $AAZ(Data)[CHK](cr)

$ delimiter character
AA address of setting module (00 to FF)
Z command for setting LED data
(Data) data for show on the LED, from -19999. to +19999. The

data need sign, 5 digits and decimal point.

Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command or LED not set to host

control

AA address of response module (00 to FF)
Example :
Comma nd : $01Z+123.45 Receive : !01

Send address 01 LED data +123.45, return success.

Comma nd : $02Z+512.34 Receive : ?02

Send address 02 LED data +512.34, return the LED is not

setting in the host mode.

Related Comma nd :
Sec.2.12 $AA8, Sec2.13 $AA8V
Note : The command is for I-7011D/11PD only

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2.19 ~AAO(Data)

Description : Set Module Name
Syntax : ~AAO(Data)[CHK](cr)

~ delimiter character
AA address of setting module (00 to FF)
O command for setting module na me
(Data) new name for module, max 6 characters
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : ~01O7018 Receive : !01

Set address 01 module name to 7018, return success.

Comma nd : $01M Receive : !017018

Read address 01 module name, return 7018.

Related Comma nd :
Sec.2.17 $AAM

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2.20 ~AAEV

Description : Enable/Disable Calibration
Syntax : ~AAEV[CHK](cr)

~ delimiter character
AA address of setting module (00 to FF)
E comma nd f or enable/disable calibration
V 1=ena ble calibration, 0=disable calibration
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Comma nd : $010 Receive : ?01

Perform address 01 span calibration, return it is not ready for

calibration.

Command : ~01E1 Receive : !01

Set address 01 to enable calibration, return success.

Comma nd : $010 Receive : !01

Preform address 01 span calibration, return success.

Related Comma nd :
Sec.2.5 $AA0, Sec.2.6 $AA1
Related Topic :
Sec.1.9 Calibration

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2.21 @AADI

Description : Read Digital I/O and Alarm Status
Syntax : @AADI[CHK](cr)

@ delimiter character
AA address of reading module (00 to FF)
DI comma nd f or reading digital I/O a nd alarm status
Response :V alid Comma nd : !AASOOII[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
S alarm enable status, 0=alarm disa ble, 1=momentary alarm

enabled, 2=latch alarm enabled.

OO digital output status, 00=DO0 off, DO1 off, 01=DO0 on,

DO1 off, 02=DO0 off, DO1 on, 03=OD0 on, DO1 on.
II digital input status, 00=input low level, 01=input high
level.
Example :
Comma nd : @01DI Receive : !0100001

Rea d a ddress 01 digital I/O status, return alarm disable, digital

outputs all off, and digital input high level.

Comma nd : @02DI Receive : !0210100

Read address 02 digital I/O status, return momentary alarm

enable, high alarm is clear , low alarm is set, a nd digital input is

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I-7011, I-7018 User ManualRev:B1.0

high.

Related Comma nd :
Sec.2.22 @AADO(Data), Set.2.23 @AAEAT, Sec.2.26 @AADA
Related Topic :

Sec.3.4 Digital Input and Event Counter, Sec.3.5 Digital Output,
Sec.3.6 High/Low Alarm

Note : The command is for I-7011/11D/11P/11PD only

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2.22 @AADO(Data)

Description : Set Digital Output
Syntax : @AADI[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
DO command for setting digital output
(Data) output value, 00=DO0 off, DO1 off, 01=DO0 on, DO1

off, 02=DO0 off, DO1 on, 03=DO0 on, DO1 on
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? delimiter for invalid command. While the alarm is en-

abled, the command will return invalid.

AA address of response module(00 to FF)
Example :
Comma nd : @01DO00 Rece ive : !01

Set address 01 digital output 00, return success.

Related Comma nd :
Sec.2.21 @AADI, Set.2.23 @AAEAT, Sec.2.26 @AADA
Related Topic :
Sec.3.5 Digital Output
Note : The command is for I-7011/11D/11P/11PD only

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2.23 @AAEAT

Description : Enable Alarm
Syntax : @AAEAT[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
EA command for enable alarm.
T alarm type, M=momentary alarm, L=latch alarm.
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Comma nd : @01EAM Receive : ?01

Set address 01 momentary alarm, return success.

Related Comma nd :
Sec.2.26 @AADA, Sec.2.27 @AACA
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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2.24 @AAHI(Data)

Description : Set High Alarm
Syntax : @AADI[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
HI comma nd for setting high alarm value
(Data) high alarm values, data format is in engineer unit format.
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Command : @01HI+2.5000 Receive : !01

Set address 01 high alarm +2.5000, return success.

Related Comma nd :
Sec.2.23 @AAEAT, Sec.2.28 @AARH
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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I-7011, I-7018 User ManualRev:B1.0

2.25 @AALO(Data)

Description : Set Low Alarm
Syntax : @AADI[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
LO comma nd f or setting high alarm value
(Data) high alarm values, data format is in engineer unit format.
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Comma nd : @01LO-2.5000 Receive : !01

Set address 01 low alarm -2.5000, return success.

Related Comma nd :
Sec.2.23 @AAEAT, Sec.2.29 @AARL
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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I-7011, I-7018 User Manual Rev:B1.0

2.26 @AADA

Description : Disa ble Alarm
Syntax : @AADA[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
DA command for disa ble alarm
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : @01DA Receive : !01

Disable address 01 alarm, return success.

Related Comma nd :
Sec.2.23 @AAEAT
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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2.27 @AACA

Description : Clear Latch Alarm
Syntax : @AACA[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
CA command for clear latch alarm
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Comma nd : @01DI Receive : !0120101

Read address 01 digital input, return latch alarm mode, low

alarm is set.

Comma nd : @01CA Receive : !01

Clear address 01 latch alarm, return success.

Comma nd : @01DI Receive : !0120001

Read address 01 digital input, return latch alarm mode, both

alarms are clear.

Related Comma nd :
Sec.2.21 @AADI, Sec.2.23 @AAEAT, Sec.2.26 @AADA
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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2.28 @AARH

Description : Rea d High Alarm
Syntax : @AARH[CHK](cr)

@ delimiter character
AA address of reading module (00 to FF)
RH command for reading high alarm
Response : V alid Command : !AA(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command.
? deli miter for invalid command.
AA address of response module(00 to FF)
(Data) high alarm value in engineer unit format.
Example :
Comma nd : @01RH Receive : !01+2.5000

Read address 01 high alarm, return +2.5000.

Related Comma nd :
Sec.2.24 @AAHI(Data)
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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2.29 @AARL

Description : Read Low Alarm
Syntax : @AARH[CHK](cr)

@ delimiter character
AA address of reading module (00 to FF)
RL command for reading low alarm
Response : V alid Command : !AA(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command.
? deli miter for invalid comma nd.
AA address of response module(00 to FF)
(Data) low alarm value in engineer unit format.
Example :
Command : @01RL Receive : !01-2.5000

Read address 01 low alarm, return -2.5000.

Related Comma nd :
Sec.2.25 @AALO(Data)
Related Topic :
Sec.3.6 High/Low Alarm
Note : The command is for I-7011/11D/11P/11PD only

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2.30 @AARE

Description : Read Event Counter
Syntax : @AARE[CHK](cr)

@ delimiter character
AA address of reading module (00 to FF)
RE command for reading event counter
Response : V alid Command : !AA(Data)[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
(Data) event counter value, from 00000 to 65535.
Example :
Command : @01RE Receive : !0101234

Read address 01 event counter, return 1234.

Related Comma nd :
Sec.2.31 @AACE
Related Topic :
Sec.3.4 Digital Input and Event Counter
Note : The command is for I-7011/11D/11P/11PD only

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2.31 @AACE

Description : Clear Event Counter
Syntax : @AACE[CHK](cr)

@ delimiter character
AA address of setting module (00 to FF)
CE command for clear event counter
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
Example :
Command : @01RE Receive : !0101234

Read address 01 event counter, return 1234.

Command : @01CE Receive : !01

Clear address 01 event counter, return success.

Command : @01RE Receive : !0100000

Read address 01 event counter, return 0.

Related Comma nd :
Sec.2.30 @AARE
Related Topic :
Sec.3.4 Digital Input and Event Counter
Note : The command is for I-7011/11D/11P/11PD only

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2.32 ~**

Description : Host OK.

Host sends this comma nd to all modules for broa dca sting the infor­mation “Host OK”.
Syntax : ~**[CHK](cr)
~ delimiter character
** command for all modules

Response : No response.
Example :

Comma nd : ~** No response

Send Host OK to all modules

Related Comma nd :
Sec.2.33 ~AA0, Sec.2.34 ~AA1, Sec.2.35 ~AA2, Sec.2.36
~AA3EVV, Sec.2.37 ~AA4, Sec.2.38 ~AA5PSS
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation

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2.33 ~AA0

Description : Rea d Module Status
Syntax : ~AA0[CHK](cr)

~ delimiter character
AA address of reading module (00 to FF)
0 command for reading module status
Response : V alid Command : !AASS[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)

Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
SS Module Status. The status will store into EEPROM and

only may reset by the command ~AA1.

*1 : Host watchdog status, 0=Disable, 1=Enable
*2 : Host watchdog timeout flag, 0=Clear, 1=Set

Example :
Comma nd : ~010 Receive : !0104

Read address 02 module status, return 04, host watchdog

timeout flag is set.

Related Comma nd :
Sec.2.34 ~AA1
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation

76543210

*1 Reserved *2 Reserved

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2.34 ~AA1

Description : Reset Module Status
Syntax : ~AA1[CHK](cr)

~ delimiter character
AA address of setting module (00 to FF)
1 command for reset module status
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : ~010 Receive : !0104

Read address 01 module status, return 04, host watchdog

timeout flag is set.

Comma nd : ~01 1 Receive : !01

Reset address 01 module status, return success.

Comma nd : ~010 Receive : !0100

Read address 01 module status, return 00, Module Status is

clear.

Related Comma nd :
Sec.2.32 ~**, Sec.2.33 ~AA0
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation

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2.35 ~AA2

Description : Read Host Watchdog Timeout Interval
Syntax : ~AA2[CHK](cr)

~ delimiter character
AA address of reading module (00 to FF)
2 command for reading host watchdog timeout interval
Response : V alid Command : !AAVV[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
VV timeout interval in HEX f ormat, each count for 0.1 sec-

ond, 01=0.1 second and FF=25.5 seconds

Example :
Comma nd : ~012 Receive : !01FF

Read address 01 host watchdog timeout interval, return FF,

host watchdog ti meout interval is 25.5 seconds.

Related Comma nd :
Sec.2.32 ~**, Sec.2.36 ~AA3EVV
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation

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2.36 ~AA3EVV

Description : Set Host Watchdog Timeout Interval
Syntax : ~AA3EVV[CHK](cr)

~ delimiter character
AA address of setting module (00 to FF)
3 command for set host watchdog timeout interval
E 1=Enable/0=Disable host watchdog
VV timeout value, from 01 to FF, each for 0.1 second
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : ~013164 Receive : !01

Set address 01 enable host watchdog and timeout interval is

64 (10.0 seconds), return success.

Comma nd : ~012 Receive : !0164

Rea d a ddress 01 host watchdog timeout interval, return ti meout

interval is 64 (10.0 seconds).

Related Comma nd :
Sec.2.32 ~**, Sec.2.35 ~AA2
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation

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2.37 ~AA4

Description : Rea d PowerOn Value and Safe Value
Syntax : ~AA4[CHK](cr)

~ delimiter character
AA address of reading module (00 to FF)
4 command for reading PowerOn Value and Safe Value
Response : V alid Command : !AAPPSS[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid comma nd
AA address of response module(00 to FF)
PP PowerOn V alue, 00=DO0 off, DO1 off, 01=DO0 on, DO1

off, 02=DO0 off, DO1 on, 03=DO0 on, DO1 on

SS Safe Value, data format is same as PP
Example :
Comma nd : ~014 Receive : !010000

Rea d a ddress 01 PowerOn/Safe Value, return PowerOn V alue

is DO0 off, DO1 off, Safe Value is DO0 off, DO1 off.

Related Comma nd :
Sec.2.38 ~AA5PPSS
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation
Note : The command is for I-7011/11D/11P/11PD only

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2.38 ~AA5PPSS

Description : Set PowerOn Value and Safe Value
Syntax : ~AA5PPSS[CHK](cr)

~ delimiter character
AA address of setting module (00 to FF)
5 command for setting PowerOn Value and Safe Value
PP PowerOn V alue, 00=DO0 of f, DO1 of f, 01=DO0 on, DO1

off, 02=DO0 off, DO1 on, 03=DO0 on, DO1 on

SS Safe Value, data format is same as PP
Response : V alid Command : !AA[CHK](cr)

Invalid Comma nd : ?AA[CHK](cr)
Syntax error or communication error may get no re-

sponse.
! delimiter for valid command
? deli miter for invalid command
AA address of response module(00 to FF)
Example :
Comma nd : ~0150003 Receive : !01

Set a ddress 01 PowerOn Value is DO0 off, DO1 off, Safe Value

is DO0 on, DO1 on, return success.

Related Comma nd :
Sec.2.37 ~AA4
Related Topic :
Sec.3.2 Module Status, Sec.3.3 Dual W atchdog Operation
Note : The command is for I-7011/11D/11P/11PD only

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I-7011, I-7018 User ManualRev:B1.0

3. Application Note

3.1 INIT* pin Operation

Ea ch I-7000 module has a build-in EEPROM to store con­figuration information such as address, type, baudrate and other
information. Sometimes, user may forget the configuration of the
module. Therefore, the I-7000 have a special mode named “INIT
mode”, to help user to resolve the problem. The “INIT mode” is
setting as Addr e ss=00, baudrate=9600bps, no checksum

To enable INIT mode, please follow these steps:
Step1. Power off the module
Step2. Connect the INIT* pin with the GND pin.
Step3. Power on
Step4. Send command $002(cr) in 9600bps to read the configura­tion stored in the module’s EEPROM.

Refer to “ 7000 Bus Converter User M a nual” Sec.5.1 and
“Getting Start” for more information.

3.2 Module Status

PowerOn Reset or Module Watchdog Reset will let all

output goto PowerOn V alue. And the module may accept the host’s
command to change the output value.

Host Watchdog Timeout will let all digital output goto
Safe Value.The host watchdog timeout flag is set, and the output

command will be ignored. The module’s LED will go to flash and
user must reset the Module Status via command to restore normal
operation.

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3.3 Dual Watchdog Operation

Dual Watchdog = Module Watchdog + Host W atchdog

The Module Watchdog is a hardware reset circuit to moni­tor the module’s operating status. While working in harsh or noisy
environment, the module may be down by the external signal. The
circuit may let the module to work continues and never halt.

The Host Watchdog is a software function to monitor the
host’s operating status. Its purpose is to prevent the network/com­munication from problem or host halt. While the timeout occurred,
the module will turn the all output into safe state to prevent from
unexpected problem of controlled target.

The I-7000 module with Dual Watchdog may let the con­trol system more reli able and stable.

3.4 Digital Input and Event Counter

The digital input DI0 may work as event counter. The
counter updates while the input changes from high level to low
level. The counter is 16-bit width and useful for low speed count,
frequency is lower than 50Hz.

3.5 Digital Output

When the module power on, the host watchdog timeout
flag is checked first. If the status is set, the digital outputs (DO0 a nd
DO1) of module will set to Safe Value. If the flag is clear , the digital
outputs will set to PowerOn Value.

If the host watchdog timeout flag is set, the module will
ignore the digital output command @AADO(Data).

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3.6 High/Low Alarm

Some analog input modules, like I-7011, equip with the
high/low alarm function. When the alarm function is enabled, the
digital output DO0 is the low alarm indicator, DO1 is the high alarm
indicator, and the digital output comma nd for changing digital out­puts DO0, DO1 is ignored. The alarm function is to compare the
a nalog input value with given high alarm value a nd low alarm value.
And there are two alarm types as follows :

z Momentary alarm : the alarm status is cleared while the

analog input is not over the alarm value.

If Analog Input Value > High Alarm, DO1(High alarm) is on,

else DO1 is off.

If Analog Input Value < Low Alarm, DO0(Low alarm) is on,

else DO0 is off.

z Latch Alarm : the alarm is cleared only the user send com-

mand to clear.

If Analog Input Value > High Alarm, DO1(High alarm) is on,
else if Analog Input V alue < Low Alarm, DO0(Low alarm) is

on.

3.7 Thermocouple Measur ement

When two wires composed of dissi milar metal are joined at
one end and heated, the open circuit voltage is a function of the
junction temperature and the composition of the two metals. All
dissimilar metals exhibit this ef fect. The voltage is called “Seebeck
voltage”. For small changes in temperature the Seebeck voltage is
linearly proportional to temperature.

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To measure the Seebeck voltage directly is not available
because we must first connect a voltmeter to the thermocouple,
and the voltmeter leads themselves create a new thermoelectric
circuit. Therefore we need to eli minate the junction thermoelectric
to measure the correct Seebeck voltage, and this is called “Cold
Junction Compensation”.

For most thermocouples, the Seebeck voltage is 0V while
in 0°C. One si mple way to cancel the junction voltage is to put the
junction into 0°C enviroment and the junction voltage is 0V. Nor ­mally , this is not a good method for most a pplication. T ypical method
is to mea sure the junction te mperature by thermistor , and measure
the junction voltage from the junction temperature. Then we may
get the Seebeck voltage from measured thermocouple voltage and
junction voltage, and we may calculate the temperature from the
Seebeck voltage.