RKC CB900 Instruction Manual

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Digital Controller

CB100/CB400 CB500/CB700

CB900

Communication

Instruction Manual

RKC INSTRUMENT INC.

IMCB03-E5

Thank you for purchasing the RKC instrument. In order to achieve maximum performance and ensure proper operation of your new instrument, carefully read all the instructions in this manual. Please place this manual in a convenient location for easy reference.

SYMBOLS

WARNING

CAUTION

NOTE

∗∗∗∗

: This mark indicates precautions that must be taken if there is danger of electric

shock, fire, etc., which could result in loss of life or injury.

: This mark indicates that if these precautions and operating procedures are not

taken, damage to the instrument may result.

: Extra noted or precautions are added to operating procedures and explanations.

: This mark indicates that all precautions should be taken for safe usage.

: This mark is used to add extra notes, precautions or supplementary explanations

to table and figures.

WARNING

An external protection device must be installed if failure of this instrument

!∀

could result in damage to the instrument, equipment or injury to personnel.

All wiring must be completed before power is turned on to prevent electric

!∀

shock, fire or damage to instrument and equipment.

This instrument must be used in accordance with the specifications to prevent

!∀

fire or damage to instrument and equipment.

This instrument is not intended for use in locations subject to flammable or

!∀

explosive gases.

Do not touch high-voltage connections such as power supply terminals, etc.

!∀

to avoid electric shock.

RKC is not responsible if this instrument is repaired, modified or

!∀

disassembled by other than factory-approved personnel. Malfunction can occur and warranty is void under these conditions.

IMCB03-E5

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CAUTION

This is a Class A instrument. In a domestic environment, this instrument may cause radio

interference, in which case the user may be required to take adequate measures. This instrument is protected from electric shock by reinforced insulation. Provide

reinforced insulation between the wire for the input signal and the wires for instrument power supply, source of power and loads. This instrument is designed for installation in an enclosed instrumentation panel. All high-

voltage connections such as power supply terminals must be enclosed in the instrumentation panel to avoid electric shock by operating personnel. All precautions described in this manual should be taken to avoid damage to the

instrument or equipment. All wiring must be in accordance with local codes and regulations.

All wiring must be completed before power is turned on to prevent electric shock,

instrument failure, or incorrect action. The power must be turned off before repairing work for input break and output failure including replacement of sensor, contactor or SSR, and all wiring must be completed before power is turned on again. To prevent instrument damage or failure, protect the power line and the input/output lines

from high currents with a protection device such as fuse, circuit breaker, etc. Prevent metal fragments or lead wire scraps from falling inside instrument case to avoid

electric shock, fire or malfunction. Tighten each terminal screw to the specified torque found in the manual to avoid electric

shock, fire or malfunction. For proper operation of this instrument, provide adequate ventilation for heat dispensation.

Do not connect wires to unused terminals as this will interfere with proper operation of the

instrument. Turn off the power supply before cleaning the instrument.

Do not use a volatile solvent such as paint thinner to clean the instrument. Deformation or

discoloration will occur. Use a soft, dry cloth to remove stains from the instrument. To avoid damage to instrument display, do not rub with an abrasive material or push front

panel with a hard object. Do not connect modular connectors to telephone line.

NOTICE

This manual assumes that the reader has a fundamental knowledge of the principles of electricity, process control, computer technology and communications.

The figures, diagrams and numeric values used in this manual are only for purpose of illustration.

RKC is not responsible for any damage or injury that is caused as a result of using this instrument, instrument failure or indirect damage.

Periodic maintenance is required for safe and proper operation of this instrument. Some components have a limited service life, or characteristics that change over time.

Every effort has been made to ensure accuracy of all information contained herein. RKC makes no warranty expressed or implied, with respect to the accuracy of the information. The information in this manual is subject to change without prior notice.

No portion of this document may be reprinted, modified, copied, transmitted, digitized, stored, processed or retrieved through any mechanical, electronic, optical or other means without prior written approval from RKC.

i-2

IMCB03-E5

Page

1. SPECIFICATIONS................................................................1

2. WIRING .................................................................................2

3. SETTING FOR COMMUNICATION ......................................5

3.1 Transfer to communication setting mode.........................................................5

3.2 Communication parameter selection ...............................................................6

3.3 Device address setting ....................................................................................7

3.4 Communication speed setting .........................................................................9

3.5 Data bit configuration setting .........................................................................11

3.6 Interval time setting........................................................................................13

3.7 Notes under communication..........................................................................16

4. COMMUNICATION PROTOCOL .......................................19

4.1 Polling............................................................................................................19

4.1.1 Polling procedure..............................................................................................20

4.1.2 Polling procedure example (When the host computer requests data) ...............23

4.2 Selecting........................................................................................................24

4.2.1 Selecting procedure..........................................................................................24

4.2.2 Selecting procedure example (When the host computer sends a set value).....27

5. COMMUNICATION IDENTIFIER.........................................28

6. TROUBLESHOOTING ........................................................34

7. ASCII 7-BIT CODE TABLE (Reference) ............................ 35

IMCB03-E5

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MEMO

i-4

IMCB03-E5

1. SPECIFICATIONS

Interface

Connection method

Communication distance:

Synchronous method

Communication speed:

Data bit configuration:

Protocol:

: Based on RS-485, EIA standard

: 2-wire system, half-duplex multi-drop connection

: Start/stop synchronous type

2400 bps, 4800 bps, 9600 bps, 19200 bps

1 km max. The maximum communication distance will be affected by

the surrounding conditions.

Start bit: 1 Data bit: 7 or 8 Parity bit: Without, Odd or Even Stop bit: 1 or 2

ANSI X3.28 subcategory 2.5, A4 Polling/selecting type

Error control :

Communication code:

Termination resistor:

Xon/Xoff control:

Maximum connections:

Signal logic:

Vertical parity (With parity bit selected) Horizontal parity (BCC check)

ASCII 7-bit code

Externally connected

None

32 instruments maximum including a host computer

RS-485

Signal voltage Logic

V (A) - V (B) ≥ 2 V 0 (SPACE) V (A) - V (B) ≤ -2 V 1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal for the (B) terminal.

IMCB03-E5

2. WIRING

WARNING

In order to prevent electric shock or instrument failure, do not turn on the power until all the wiring is finished.

Up to 32 CB100/CB400/CB500/CB700/CB900 digital controller (hereinafter, the "controller") including the host computer can be connected if multidrop connected by RS-485.

Terminal No. and signal details

!∀

CB100/CB400/CB500/CB900

Signal direction

Terminal No. Signal name Name

Controller Host computer

13 SG Signal ground

14 T/R(A) Send data/Receive data

15 T/R(B) Send data/Receive data

CB700

Terminal No. Signal name Name

7 SG Signal ground

8 T/R(A) Send data/Receive data

9 T/R(B) Send data/Receive data

Signal direction

Controller Host computer

IMCB03-E5

When host computer interface is RS-485

(B)

(A)

(B)

(A)

)

(B)

(A)

!∀

!∀!∀

It is necessary that a circuit to transfer send and receive be built-in the host computer.

Controller

T/R

Controller

T/R

# # #

to 31

RS-485

Twisted pair wire

(with shield)

*R: Termination resistors (Example: 120 Ω 1/2 W)

Paired wire

Host com

SG T/R

T/R

SD (TXD) and RD (RXD): Negative logic

uter

SD (TXD

RD (RXD)!Receive data

Send/receive selection signal

Send data

2. WIRING

When host computer interface is RS-232C

!∀

!∀!∀

RS-232C/RS-485 converter is required.

RS-485

Controller

T/R(A)

T/R(B)

Twisted pair wire

(with shield)

*R: Termination resistors (Example: 120 Ω 1/2 W)

Paired wire

RS-232C/RS-485

converter

T/R(A)

T/R(B)

Host computer

RS-232C

CAUTION

When the host computer use Windows 95/98/NT, use a RS-232C/RS-485 converter with an automatic send/receive transfer function.

Recommended: CD485, CD485/V manufactured by Data Link, Inc. or equivalent.

IMCB03-E5

2. WIRING

Connection example

!∀

!∀!∀

(Connection with up to 31 controllers and one host computer)

Host computerHost computer

RS-232C

Device address

RS-485

Controller

RS-232C/RS-485 converter

RS-485

Junction terminal

2928 300 1 2 3

Controller

IMCB03-E5

3. SETTING FOR COMMUNICATION

In order to make communication between the CB100/CB400/CB500/CB700/CB900 digital controller (hereinafter, the "controller") and the host computer, it is necessary to set the device address, communication speed, data construction and interval time. Communication settings are made in communication setting mode. The following pictures used for explanation are for CB900. However, the same operation also applies to other controllers. The section in each picture is dimly lit.

3.1 Transfer to communication setting mode

Turn on the power to this controller. Thus, the input type, input range and PV/SV display mode

∃

change in this order.

Pressing the <R/S key while the SET key is being pressed when PV/SV display mode is being

displayed selects communication setting mode. In this mode, device address "Add" are displayed in the first place.

Communication setting modePV/SV display mode

Device address

SET

ALM2ALM1AT OUT2OUT1

R/S

SET

ALM2ALM1AT OUT2OUT1

R/S

NOTES

&∀

The communication setting mode can be selected anytime when the SV setting mode.

&∀

In order to terminate the communication setting mode, press the <R/S key while pressing the SET key. After the communication setting mode terminates, the display changes to the PV/SV display mode.

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.2 Communication parameter selection

Parameters in communication setting mode are selected in the order of device address "Add," communication speed "bPS," data construction "bIT" and interval time set value "InT." Each parameter is selected by pressing the SET key.

Display flowchart

!∀

!∀!∀

Power ON

Display changes automatically

Input type and input range display

PV/SV display mode

Communication setting mode

(Display for approx. 4 sec)

Press the SET key.

Pressing the <R/S key while the SET key.

Device address

Add

(

)

Press the SET key.

Communication speed

bPS

(

)

Press the SET key.

Data bit configuration

bIT

(

)

SV setting mode

PV/SV display

mode

Press the <R/S key while pressing the SET key.

Press the SET key.

Interval time set value

InT

(

)

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.3 Device address setting

Set the device address by using numerals from 0 to 99. Press the UP or DOWN key to change the numeral, and also press the <R/S key to shift the digit.

Symbol Name Setting range Description

Device address 0 to 99 Sets the controller device

address.

Add

CAUTIONS

When the communication parameter was changed, always turn on the power again.

&∀

Otherwise, no communication is performed by using the changed value.

If key operation is not performed for more than 1 minute without pressing the SET key

&∀

after the device address is set, the controller is automatically changed to PV/SV display mode. In this case, the set device address returns to the value before the setting is changed.

Setting procedure

!∀

!∀!∀

Example: When setting device address to 15.

Factory set

value

1. Change the controller to communication setting mode, and then display the device address (See P. 5, 6).

Device address

SET

R/S

ALM2ALM1AT OUT2OUT1

IMCB03-E5

3. SETTING FOR COMMUNICATION

2. Set the device address. Press the UP key to enter "5" in the lowest digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

3. Press the <R/S key to brightly light the tens digit.

SET

R/S

ALM2ALM1AT OUT2OUT1

4. Press the UP key to enter "1" in the tens digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

5. Press the SET key to select the next communication parameter. As a result, the set device address is registered.

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.4 Communication speed setting

Set a communication speed of 2400 bps, 4800 bps, 9600 bps or 19200 bps by using numerals from 0 to 3. Press the UP or DOWN key to change the numeral.

Symbol Name Setting range Description

Factory set

Communication speed

0 : 2400 bps 1 : 4800 bps

Selects the communication speed.

2 : 9600 bps

bPS

3 : 19200 bps

CAUTIONS

Set the same communication speed to both the controller and connecting host computer.

&∀

When the communication parameter was changed, always turn on the power again.

&∀

Otherwise, no communication is performed by using the changed value.

If key operation is not performed for more than 1 minute without pressing the SET key

&∀

after the communication speed is set, the controller is automatically changed to PV/SV display mode. In this case, the set communication speed returns to the value before the setting is changed.

value

Setting procedure

!∀

!∀!∀

Example: When setting communication speed to "1: 4800 bps."

1. Change the controller to communication setting mode, and then display the communication speed (See P. 5, 6).

Communication speed

ALM2ALM1AT OUT2OUT1

SET

R/S

IMCB03-E5

3. SETTING FOR COMMUNICATION

2. Press the DOWN key to enter "1" in the lowest digit. As a result, a communication speed of 4800 bps is set.

SET

R/S

ALM2ALM1AT OUT2OUT1

3. Press the SET key to change to the next communication parameter. As a result, the set communication speed is registered.

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.5 Data bit configuration setting

Set the data bit configuration during communication by using numerals from 0 to 5. Press the UP or DOWN key to change the numeral.

Symbol Name Setting range Description

Data bit configuration

bIT

Setting Data bit [bit] Parity bit Stop bit [bit]

0 8 None 1

1 8 None 2

27 Even 1

37 Even 2

47 Odd 1

57 Odd 2

0 to 5

See *

Selects data bit configuration during communication.

CAUTIONS

Factory set

value

Set the same data bit configuration to both the controller and connecting host computer.

&∀

When the communication parameter was changed, always turn on the power again.

&∀

Otherwise, no communication is performed by using the changed value.

If key operation is not performed for more than 1 minute without pressing the SET key

&∀

after the data bit configuration is set, the controller is automatically changed to PV/SV display mode. In this case, the set data bit configuration returns to the value before the setting is changed.

IMCB03-E5

3. SETTING FOR COMMUNICATION

Setting procedure

!∀

!∀!∀

Example: When setting data bit configuration to "1: 8 data bits, no parity bit and 2 stop bits."

1. Change the controller to communication setting mode, and then display the data bit configuration (See P. 5, 6).

Data bit configuration

SET

R/S

ALM2ALM1AT OUT2OUT1

2. Press the UP key to enter "1" in the lowest digit. As a result, data bit configuration is set to "8 data bits, no parity bit and 2 stop bits."

SET

ALM2ALM1AT OUT2OUT1

R/S

3. Press the SET key to change to the next communication parameter. As a result, the set data bit configuration is registered.

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.6 Interval time setting

Set the interval time. Press the UP or DOWN key to change the numeral, and press the <R/S key to shift the digit.

Symbol Name Setting range Description

Interval time set value

0 to 150

Sets the value to set the interval time.

InT

*A : Can be set up to 250 ms if converted to interval time.

Equations for calculating interval time and interval time set value

Equations :

Interval time = Interval time set value × 1.666 ms Interval time set value = Interval time ÷ 1.666 ms

CAUTIONS

When the communication parameter was changed, always turn on the power again.

&∀

Otherwise, no communication is performed by using the changed value.

If key operation is not performed for more than 1 minute without pressing the SET key

&∀

after the interval time set value is set, the controller is automatically changed to PV/SV display mode. In this case, the set interval time set value returns to the value before the setting is changed.

Factory set

value

Setting procedure

!∀

!∀!∀

Example: When setting interval time to 250 ms.

1. Change the controller to communication setting mode, and then display the interval time set value (See P. 5, 6).

Interval time set value

ALM2ALM1AT OUT2OUT1

SET

IMCB03-E5

R/S

3. SETTING FOR COMMUNICATION

2. Here, as an interval time of 250 ms needs to be set, calculate the interval time set value using the equation (See P. 13).

Interval time set value:

250 ms ÷ 1.666 ms 150 (Round to the nearest whole number.)

Interval time:

150 × 1.666 ms 249.9 (Approx. 250 ms)

Thus, enter an interval time set value of 150 calculated from the above by pressing the UP or DOWN key at the front of the controller.

3. Press the DOWN key to enter "0" in the lowest digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

4. Press the <R/S key to brightly light the tens digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

IMCB03-E5

3. SETTING FOR COMMUNICATION

5. Press the UP key to enter "5" in the tens digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

6. Press the <R/S key to brightly light the hundreds digit.

SET

R/S

ALM2ALM1AT OUT2OUT1

7. Press the UP key to enter "1" in the hundreds digit.

SET

ALM2ALM1AT OUT2OUT1

R/S

8. Press the SET key to change to the next communication parameter. As a result, the set interval time set value is registered.

IMCB03-E5

3. SETTING FOR COMMUNICATION

3.7 Notes under communication

(1) If polling is made by specifying the identifier of the function which is not added to the controller,

the controller sends [EOT]. In addition, if selecting is made, the controller sends [NAK].

(2) When the communication parameter was changed, always turn on the power again. Otherwise, no

communication is performed by using the changed value.

(3) Send/receive timing

The controller requires the following processing times during data send/receive.

Polling procedure

Procedure details

Response send time after calling [ENQ] receive 1.5 2.0 3.0

Response send time after acknowledgment [ACK] receive 1.5 2.0 3.5

Response send time after negative acknowledge [NAK] receive

Response send time after BCC send 0.7 1.0

MIN TYP MAX

1.0 1.5 3.0

Time (ms)

NOTES

&∀

Data-link is terminated sending [EOT], if no response within about 3 sec after BCC send.

&∀

Response send time is the time at having set interval time in 0 ms.

Selecting procedure

Procedure details

MIN TYP MAX

Response send time after BCC receive 2.0 3.0 4.0

Response wait time after acknowledgment [ACK] send 0.7 1.0

Time (ms)

Response wait time after negative acknowledge [NAK] send 0.7 1.0

NOTE

&∀

Response send time is the time at having set interval time in 0 ms.

IMCB03-E5

3. SETTING FOR COMMUNICATION

(a)

(b)

(c)

(a)

(b)

)

RS-485 (2-wire system) send/receive timing

!∀

!∀!∀

The transmission and reception of RS-485 communication are operated by a transmitting wire. Therefore, the timing of switching should be acted correctly. Send/receive example in the host computer and controller is show in the following.

Polling procedure

Send data

(Poss ible/

Host

Impossible)

computer

Sending status

Send data

(Poss ible/

Controller

Impossible)

Sending status

(a):

(Response send time after calling [ENQ] receive) + (Interval time)

(b):

Response send time after [BCC] send

(c):

(Response send time after acknowledgment [ACK] receive + (Interval time) or (Response send time after negative acknowledge [NAK] receive + (Interval time)

Selecting procedure

Host computer

Controller

Send data

(Possible/

ossible

Sending status

Send data

(Possible/

Impossible)

Possible

Impossible

Possible

Impossible

! ∀

Impossible

) #

,,,

∗

! ∃ %

+ ∋ ∋

) # ∗

+ ∋ ∋

∃

∋

(

Sending status

(a):

(Response send time after BCC receive) + (Interval time)

b):

(

Response wait time after acknowledgment [ACK] send or

& ∋ (

∃ & (

Response wait time after negative acknowledge [NAK] send

IMCB03-E5

3. SETTING FOR COMMUNICATION

When host computer is selected from data sending to data receiving

!∀

!∀!∀

When switching the host computer into reception from transmission, it must be confirmed that the data was surely put on line. This is not observe the transmission buffer of host computer itself, but confirming with shift register.

Transmission data

8 bit

Transmission buffer

8 bit

Shift register

Transmission data

Transmitting 1 bit each

Next, the controller side secures the maximum time until the transmission line changes to the data receiving side (until the controller is ready to send data) after the host computer has received the stop bit corresponding to the final character. This maximum time corresponds to interval time. If no interval time is set, the controller side may be set to the send state even when the host computer side is not set to the receive state. As a result, no communication is conducted correctly. In addition, set the interval time so as to match the host computer.

When host computer is selected from data receiving to data sending

!∀

!∀!∀

Polling procedure "Response wait time after BCC send" or selecting procedure "Response wait time after [ACK] or [NAK] send" is processing time required during controller data sending. Therefore, select the host computer from receiving to sending after the lapse of the above time. As for the necessary processing time, refer to the table of page 16.

(4) A transmission error may occur with the transmission line disconnected, shorted or set to the high-

impedance state. In order to prevent the above error, it is recommended that the fail-safe function be provided on the receiver side of the host computer. The fail-safe function can prevent a framing error from its occurrence by making the receiver output stable to the MARK (1) when the transmission line is in the high-impedance state.

(5) The nonvolatile memory (EEPROM) for data backup has limitations on the number of memory

rewrite times (approx. 100,000 times). Avoid using the memory to frequently change the set value via communication.

IMCB03-E5

4. COMMUNICATION PROTOCOL

[

]

[

]

[

]

[

]

[

]

The CB100/CB400/CB500/CB700/CB900 digital controller (hereinafter, the "controller") uses the polling/selecting method to establish a data link. The basic procedure is followed ANSI X3.28 subcategory 2.5, A4 basic mode data transmission control procedure (Fast selecting is established for selecting).

!∀In the polling/selecting method, the controller is controlled completely by the host computer is

permitted. Since the host computer invites information message sending from and receiving to the controller, send the data in accordance with the polling or selecting procedure. (Centralized control method)

!∀The code use in communication is 7-bit ASCII code including transmission control character. The

transmission control characters are [EOT] (04H), [ENQ] (05H), [ACK] (06H), [NAK] (15H), [STX] (02H) and [ETX] (03H). The figure in the parenthesis is indicating hexadecimal number.

4.1 Polling

Polling is an action that host computer requesting one of the controller which selected among multidrop connected, to transmit the data. The procedure is as the following.

Host computer send

Address

O T

(1)

ID: Identifier

(2)

Host

Controller send

E N

No response

computer send

Controller send

(5)

(4)

(3)

E T X

BCC

(8)

No response

Time out

T X

Data

(9)

Indefinite

Host computer send

E O T

(10)

E O T

(6)

C K

(7)

IMCB03-E5

4. COMMUNICATION PROTOCOL

4.1.1 Polling procedure

(1) Initialize of data link

Host computer sends [EOT] for initializing of data link before polling sequence.

(2) Polling sequence send

Host computer sends polling sequence with a format shown below.

∃%#

ENQ

Device address

Device address [Number of digits: 2]

####

This data is a device address of the controller for polled and must be the same as the device address set value in item "

Identifier [Number of digits : 2] (See P. 28.)

∃∃∃∃

This is for identifying data requested for the controller. Always attach the [ENQ] code to the end of the identifier.

[ENQ]

%%%%

This is the transmission control character which indicates the end of the polling sequence. Then, the host computer waits for response from the controller.

Identifier

3.3 Device address setting

" (P. 7).

Example:

ENQ

(3) Controller data send

If the polling sequence is received correctly, the controller sends data in the following format.

STX]

[

####

This is the transmission control character which indicates the start of the text (identifier and data).

∃&∋%

Identifier Data BCCETXSTX

IMCB03-E5

4. COMMUNICATION PROTOCOL

Identifier [Number of digits: 2] (See P. 28.)

∃∃∃∃

This is for identifying data (measured value, status and set value) sent to the host computer.

Data [Number of digits: 6]

%%%%

Data indicated by the identifier belonging to the controller. It is expressed in decimal ASCII code including a minus sing (-) and a decimal point. No zero suppression is made.

[ETX]

∋∋∋∋

A transmission control character used to indicate text end.

[BCC]

&&&&

BCC (Block Check Character) for error detection using horizontal parity. BCC is calculated by horizontal parity (even number).

Take off EX-OR (exclusive OR) of all character from next [STX] through [ETX]. Not including [STX].

Example:

In the case of the data are :

5STX

30H30H35H30H30H30H31H4DH

BCCETX0001M

In the parenthesis are indicated with hexadecimal number.

BCC = 4DH ⊕ 31H ⊕ 30H ⊕ 30H ⊕ 30H ⊕ 35H ⊕ 30H ⊕ 30H ⊕ 03H = 7AH

Value of BCC becomes 7AH.

(4) Controller data send end (EOT send)

If the following cases, the controller sends [EOT] to terminate the data link.

∀

!∀When there is no specified identifier. !∀When there is an error in the data type. !∀When all the data has been sent. !∀When a identifier not added to the controller is specified.

∀

(5) Controller no response

The controller is set to no response when the polling sequence is not received correctly. If necessary, take time out recovery etc. for the host computer.

IMCB03-E5

4. COMMUNICATION PROTOCOL

(6) Acknowledgment [ACK]

Send [ACK] when the host computer could receive data items correctly. Next, the controller sends the identifier data following the identifier just sent in succession shown in

Communication identifier list

"( If data send from the controller is suspend, send [EOT] to terminate the data link.

" (P. 28).

(7) Negative acknowledge [NAK]

If the host computer cannot receive send data correctly from the controller, it sends [NAK] to the controller. Then, the controller re-sends the same data to the host computer. As the number of re-send times is not specified, take the necessary measures on the host computer side if no recovery is made.

(8) No response from host computer

When the host computer is set to no response after the controller sends data, the controller sends [EOT] as time-out processing to terminate the data link (time-out time : about 3 sec).

(9) Indefinite response from host computer

When the response from the host computer is indefinite, the controller sends [EOT] to terminate the data link.

(10) Data link termination [EOT]

If it is necessary to suspend communication with the controller or to terminate the data link due to no response from the controller, the host computer sends [EOT].

IMCB03-E5

4.1.2 Polling procedure example (When the host computer requests data)

Normal transmission

(∀

(∀(∀

4. COMMUNICATION PROTOCOL

Host computer send

1M 1

O T

04H

30H

Polling address

For the presence of error in data

(∀

(∀(∀

Host computer send

1M 1

O T

04H030H

Polling address

Identifier

E N Q

05H31H 4DH 31H

M10 0 1 0.0

T X

02H 4DH 31H 30H 30H 31H 30H 2EH 30H 03H 60H

Identifier

E N Q

05H31H 4DH 31H

M10 0 1

T X

02H 4DH 31H 30H 30H 31H

Data

Send data

Controller send

Error data

Host computer send Host computer send

A C K

06H

Host computer send Host computer send

2EH

30H 03H 60H

AA000000

T X

02H 41H 41H 30H 30H 30H 30H 30H 30H 03H 03H

Next send data Controller send

N A K

15H

M1 00 10.0

T X

02H 4DH 31H 30H 30H 31H 30H 2EH 30H 03H 60H

E T X

E O T

04H

B C C

A C K

06H

B C C

IMCB03-E5

Identifier

Data

Send data

Controller send

Re-send data

Controller send

4. COMMUNICATION PROTOCOL

[

]

4.2 Selecting

Selecting is an operation in which the host computer selects one from among the controllers multidrop connected and then of recommending data receive. The procedure is as the following. Due to adopted fast selecting in controllers therefore becomes the type to send the data which connected to selecting sequence.

Host computer send

(7)

(1)

Address

(2)

Host com

S T X

uter send

[ Identifier ]

[ Data ]

(3)

[ BCC ]

T X

Controller send

No response

(6)

C K

(4)

(5)

4.2.1 Selecting procedure

(1) Initialize of data link

Host computer sends [EOT] for initializing of data link before selecting sequence.

(2) Selecting address send

Send the selecting address selected as the selecting sequence from the host computer.

[Device address] (Number of digits : 2)

This data is a device address of the controller to be selected and must be the same as the device address set value in item "

3.3 Device address setting

" (P. 7).

IMCB03-E5

4. COMMUNICATION PROTOCOL

(3) Data send

Host computer to send the data with a format indicated below continuing the selecting sequence.

#∃

Identifier Data BCCETXSTX

* For [STX], [ETX] and [BCC], see item "

Identifier [Number of digits : 2] (See P. 28.)

####

This identifies the data (set value) which is sent by the host computer.

Data [Number of digits : 6]

∃∃∃∃

Data is the information being sent to the controller. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point (period).

About numerical data

!∀

!∀!∀

The data that receipt of letter is possible

• Data with numbers below the decimal point omitted or zero suppressed data can be received.

<Example> When data send with -001.5, -01.5, -1.5, -1.50, -1.500 at the time of -1.5, controller

can receive a data.

• When the host computer send data with decimal point to item of without decimal point, controller

receives a message with the value which cut off below the decimal point.

<Example> When setting range is 0 to 200, controller receives as a following.

Send data

Receive data

0.5 100.5

0 100

4.1 Polling"

(P. 19).

• Controller receives value in accordance with decided place after the decimal point. The value

below the decided place after the decimal point is cut off.

<Example> When setting range is -10.00 to +10.00, controller receives as a following.

Send data

Receive data

The data that receipt of letter is impossible

Controller sends NAK when received a following data.

+ Plus sign and the data that gained plus sing

- Only minus sign (there is no figure)

. Only decimal point (period)

IMCB03-E5

-.5 -.058 .05 -0

-0.50 -0.05 0.05 0.00

4. COMMUNICATION PROTOCOL

(4) Acknowledgment [ACK]

If the controller correctly received data sent from the host computer, send [ACK]. Then, if there is data to be sent next on the host computer side, send the data. After the data has been sent, send [EOT] to terminate the data link.

(5) Negative acknowledge [NAK]

The controller sends [NAK] in the following cases. Then the appropriate recovery processing steps, such as data resend on the host computer side should be taken.

!∀When an error occurs on the line (parity, framing error, etc.). !∀When a BCC check error occurs. !∀When there is no identifier. !∀When receive data is not in the specified configuration

(Text is not in the "Identifier + data construction.")

!∀When the number of receive data digits exceeds 6. !∀When normally receive data exceeds the setting range. !∀When the identifier not added to the controller is specified.

(6) No response

If the selecting address is not received correctly, the controller is set to no response, if [STX], [ETX] and [BCC] is not received correctly, the controller is also set to no response.

(7) Data link termination [EOT]

When terminating the data link because there was no more to be sent on the host computer side or the controller was set to no response, send [EOT] from the host computer.

IMCB03-E5

4.2.2 Selecting procedure example (When the host computer sends a set value)

Normal transmission

(∀

(∀(∀

4. COMMUNICATION PROTOCOL

Host computer send

E O T

Selecting address

For the presence of error in data

(∀

(∀(∀

E OT01

Selecting address

31H30H04H 02H 53H 31H 32H 31H 30H 2EH 30H 03H 4DH

S1200.0

T X

31H30H04H 02H 53H 31H 32H 30H 30H 2EH 30H 03H 4DH

Identifier

Host computer send

S1210.0ET

T X

Identifier

Data

Send data

Data

Send data

E T X

Error data

B C C

A C K

06H

Controller send

B C C

N A K

15H

Controller send

Host computer send Host computer send

P11.0

T X

02H 50H

31H 31H 2EH

Next send data

Host computer send Host computer send

S T

S1200.0ET

02H 53H 31H 32H 30H 30H 2EH 30H 03H 4DH

Re-send data

30H 03H 4DH 04H

Controller send

E O T

A C K

06H

B C C

A C K

06H

Controller send

S T X

02H 31H50H

IMCB03-E5

5. COMMUNICATION IDENTIFIER

Communication identifier list

(∀

(∀(∀

NOTES

!∀Communication is not possible when an identifier is specified that the controller can not

recognize.

!∀The number of digits is 6 for all data.

(Attributes RO: Read only, R/W: Read/Write)

Name

Measured value (PV)

Current transformer input 1

See *1.

Current transformer input 2

See *2.

Alarm 1 status

See *3.

Alarm 2 status

See *1.

Burnout

Error code

RUN/STOP transfer

Set value (SV)

Alarm 1 setting

See *3.

Alarm 2 setting

See *1.

Iden-

tifier

A1 Temperature input

A2 Voltage/ current inputs

Within input range ---- RO

0.0 to 100.0 A ---- RO

0: OFF 1: ON ---- RO

0 to 255 See *4. ---- RO

0: RUN 1: STOP 0 R/W

Within input range 0 R/W

Process alarm, deviation alarm,

SV alarm:

-1999 to +9999 °C [°F] or

-199.9 to +999.9 °C [°F]

Deviation alarm: -span to +span

Data range

(Within 9999)

Factory set

value

Temperature input: 50 or 50.0

Voltage/ current inputs: 5.0

Attribute

R/W

Process alarm, SV alarm:

Within input range

Continued on the next page.

IMCB03-E5

5. COMMUNICATION IDENTIFIER

Name

Heater break alarm 1 setting

See *1.

Heater break alarm 2 setting

See *2.

Control loop break alarm (LBA) setting

See *1, *3.

LBA deadband

See *1, *3.

Autotuning (AT)

Iden-

tifier

Data range

value

Attribute

0.0 to 100.0 A 0.0 R/W

0.1 to 200.0 min. 8.0 R/W

Factory set

Temperature input:

0R/W

0 to 9999 °C [°F]

Voltage/current inputs:

0 to 100 % of span

0: Autotuning (AT) end or

0R/W

suspension

1: Autotuning (AT) start

Self-tuning (ST)

See *5.

Heat-side proportional band

Integral time

*Change to "0" automatically at

the end of Autotuning.

0: Self-tuning (ST) suspension 1: Self-tuning (ST) start

Temperature input:

1 (0.1) to span or

9999 (999.9) °C [°F]

Voltage/current inputs :

0.1 to 100.0 % of span

(ON/OFF action control when set to 0 or 0.0.)

*Cannot be set while the self-tuning

(ST) function is activated. Only polling can be made.

1 to 3600 sec (0: PD control)

*Cannot be set while the self-tuning

(ST) function is activated. Only polling can be made.

0R/W

Temperature

R/W input: 30 (30.0)

Voltage/ current inputs: 3.0

240 R/W

IMCB03-E5

Continued on the next page.

5. COMMUNICATION IDENTIFIER

Name

Derivative time

Anti-reset windup

Heat-side proportioning cycle

Cool-side proportional band

See *7.

Overlap/deadband

See *7.

Iden-

tifier

Data range

1 to 3600 sec (0: PI control) *Cannot be set while the self-tuning

(ST) function is activated. Only polling can be made.

1 to 100 % of

heat-side proportional band (0: Integral action OFF)

*Cannot be set while the self-tuning

(ST) function is activated. Only polling can be made.

1 to 100 sec (Not set if the control output is current output.)

1 to 1000 % of heat-side proportional band

Temperature input:

-10 to +10 °C [°F] or

-10.0 to +10.0 °C [°F]

Factory

set value

Attrib-

ute

60 R/W

100 R/W

See *6.R/W

100 R/W

0 or 0.0 R/W

Cool-side proportioning cycle

See *7.

PV bias

Set data lock function

EEPROM storage mode

See *10.

EEPROM storage state

See *11.

Voltage/current inputs:

-10.0 to +10.0 % of span

1 to 100 sec

See *8.R/W

(Not set if the control output is current output.)

-span to +span

0 or 0.0 R/W

However, temperature input:

-1999 to +9999 °C [°F] or

-199.9 to +999.9 °C [°F]

0 to 7 See *9.0 R/W

0: Backup mode

(Set values are store to the EEPROM when set values are changed.)

0R/W

1: Buffer mode

(Not set values are store to the EEPROM when set values are changed.)

0: The content of the EEPROM does

----- RO

not coincide with that of the RAM.

1: The content of the EEPROM

coincides with that of the RAM.

IMCB03-E5

5. COMMUNICATION IDENTIFIER

*1: The communicable identifier differs depending on the alarm type specified in alarm 2.

− : Communication is impossible × : Communication is possible

The alarm type specified in alarm 2

Name Iden-

Current transformer

tifier

Deviation

alarm

Process

alarm

LBA

HBA

SV alarm No

alarm

− −−× −−

input 1 Alarm 2 status Alarm 2 setting Heater break alarm 1

A2 A3

× ××× ×− × ×−− ×−

− −−× −−

setting Control loop break

− −×− −−

alarm setting LBA deadband

As control loop break alarm, only either the alarm 1 or alarm 2 is specified.

*LBA: Control loop break alarm **HBA: Heater break alarm

− −×− −−

*2: This is an identifier which enables communication when specifying to the Z-168 specification.

*3: The communicable identifier differs depending on the alarm type specified in alarm 1.

− : Communication is impossible × : Communication is possible

The alarm type specified in alarm 1

Name Iden-

Alarm 1 status Alarm 1 setting Control loop break

tifier

A1 A5

Deviation

alarm

Process

alarm

LBA

SV alarm No

alarm

××××− ××−×−

−−×−−

alarm setting LBA deadband

As control loop break alarm, only either the alarm 1 or alarm 2 is specified.

*LBA: Control loop break alarm

−−×−−

*4: Any number other than "0" indicates errors (RAM write error, etc.) detected by the controller self-

diagnosis function. Please contact RKC sales office or the agent.

*5: • In a controlled system in which ripples may be contained by the application of periodic

disturbances, use this instrument with the self-tuning function turned off.

• This is an identifier which enables communication at PID action with autotuning (Reverse

action/Direct action).

*6: Relay contact output: 20 sec

Voltage pulse output, Trigger output for triac driving, Triac output: 2 sec

IMCB03-E5

5. COMMUNICATION IDENTIFIER

*7: This is an identifier which enables communication at heat/cool PID action with autotuning (Water

cooling/Air cooling).

*8: Relay contact output: 20 sec Voltage pulse output, Triac output: 2 sec

*9: Details of set data lock level selection.

− : Unsettable (Data locked) ×: Settable (Data unlocked)

Set data Set value

0 1 2 3 4 5 6 7

×× × ×× − ×− × ×− −

−× ×

−× −

−− ×

−− −

Alarm setting

(Alarm 1, Alarm 2)*AOther setting items

*A: All setting items other than set value and alarm settings (alarm 1 or alarm 2).

NOTE

The set data lock function is effective only for the setting performed by key operation. Setting items in the data lock state cannot be set by key operation, but can a always be selected via communication.

*10: The non-volatile memory (EEPROM) has limitations on the number of memory rewrite times.

If the buffer mode is selected as an EEPROM storage mode, all of the set values changed are not written to the EEPROM and thus a problem of limitations on the number of memory rewrite times can be solved. When the memory is used to frequently change the set value via communication, select the buffer mode.

When selecting any EEPROM storage mode, take notice of the following.

• If power failure occurs while the buffer mode is selected, the set value returns to the value

before the storage mode is selected.

• If the buffer mode is changed to the backup mode, all of the set values at that time are stored

to the EEPROM. If necessary to backup the final value of each set item, select the backup mode.

• When the power is turned on, the backup mode is always set.

*11: The contents of the buffer memory and those of the EEPROM can be checked.

When data is 0: The contents of the buffer memory do not match with those of the EEPROM.

• As data is being written to the EEPROM in backup mode, do not turn the

power off. If turned off, no set values are stored.

• If the set value is changed after the backup mode is changed to the buffer

mode, 0 is set (mismatch). As the set value changed is not backup, select the backup mode if necessary.

When data is 1: The contents of the buffer memory match with those of the EEPROM.

(Data write to the EEPROM is completed.)

IMCB03-E5

!∀

Input range table

!∀!∀

Thermocouple input

Code

W5Re/ W26Re

Input type

0 to 200 °CK01 0 to 400 °CK02 0 to 600 °CK03 0 to 800 °CK04 0 to 1000 °CK05 0 to 1200 °CK06 0 to 1372 °CK07 0 to 100 °CK13 0 to 300 °CK14 0 to 450 °CK17 0 to 500 °CK20 0 to 800 °FKA1 0 to 1600 °FKA2 0 to 2502 °FKA3

20 to 70 °FKA9

0 to 200 °CJ01 0 to 400 °CJ02 0 to 600 °CJ03 0 to 800 °CJ04 0 to 1000 °CJ05 0 to 1200 °CJ06 0 to 450 °CJ10 0 to 800 °FJA1 0 to 1600 °FJA2 0 to 2192 °FJA3 0 to 400 °FJA6 0 to 300 °FJA7 0 to 1600 °C 0 to 1769 °C 0 to 1350 °C 0 to 3200 °F 0 to 3216 °F 0 to 1600 °C 0 to 1769 °C 0 to 3200 °F 0 to 3216 °F

400 to 1800 °CB01

0 to 1820 °C

800 to 3200 °FBA1

0 to 3308 °F 0 to 800 °CE01 0 to 1000 °CE02 0 to 1600 °FEA1 0 to 1832 °FEA2 0 to 1200 °CN01 0 to 1300 °CN02 0 to 2300 °FNA1 0 to 2372 °FNA2

-199.9 to +400.0 °C

-199.9 to +100.0 °C

-100.0 to +200.0 °CT 03

0.0 to 350.0 °CT04

-199.9 to +752.0 °F

-100.0 to +200.0 °F

-100.0 to +400.0 °F

0.0 to 450.0 °FTA4

0.0 to 752.0 °FTA5 0 to 2000 °CW01 0 to 2320 °CW02 0 to 4000 °FWA1

Input Range

R01

R02

R04

RA1

RA2

S01

S02

SA1

SA2

B02

BA2

* *

* * *

T01

T02

TA1

TA2

TA3

PL II

RTD input

Pt100

JPt100

Voltage input and Current input

0 to 5 V DC 4 01 0 to 10 V DC 1 to 5 V DC 0.0 to

0 to 20 mA DC 7 01 4 to 20 mA DC 8 01

Z-1010 specification

Input type

-199.9 to +600.0 °C*

-199.9 to +100.0 °C*

-199.9 to +999.9 °F*

-100.0 to +200.0 °F*

Input type

-199.9 to +649.0 °CD 01

-199.9 to +200.0 °CD 02

-100.0 to +50.0 °CD03

-100.0 to +100.0 °CD 04

-100.0 to +200.0 °CD 05

-199.9 to +999.9 °FD A1

-199.9 to +400.0 °FD A2

-199.9 to +200.0 °FD A3

-100.0 to +100.0 °FD A4

-100.0 to +300.0 °FD A5

-199.9 to +649.0 °CP 01

-199.9 to +200.0 °CP 02

-100.0 to +50.0 °CP03

-100.0 to +100.0 °CP 04

-100.0 to +200.0 °CP 05

Input type

*1: 0 to 399 °C/0 to 751 °F: Accuracy is not guaranteed. *2: -199.9 to -100.0 °C/-199.9 to -148.0 °F : Accuracy is not guaranteed.

5. COMMUNICATION IDENTIFIER

Code

Input Range

0 to 1300 °CA01 0 to 1390 °CA02 0 to 1200 °CA03 0 to 2400 °FAA1 0 to 2534 °FAA2

0.0 to 400.0 °CU03

0.0 to 999.9 °FUA3 0 to 400 °CL01 0 to 800 °CL02 0 to 800 °FLA1 0 to 1600 °FLA2

0.0 to 50.0 °CD06

0.0 to 100.0 °CD07

0.0 to 200.0 °CD08

0.0 to 300.0 °CD09

0.0 to 500.0 °CD10

0.0 to 100.0 °FDA6

0.0 to 200.0 °FDA7

0.0 to 400.0 °FDA8

0.0 to 500.0 °FDA9

0.0 to 50.0 °CP06

0.0 to 100.0 °CP07

0.0 to 200.0 °CP08

0.0 to 300.0 °CP09

0.0 to 500.0 °CP10

100.0 %

U01

U02

UA1

UA2

Code

Input Range

Code

Input Range

501 601

IMCB03-E5

6. TROUBLESHOOTING

This section lists some of the main causes and solutions for communication problems. If you can not solve a problem, please contact RKC sales office or the agent, on confirming the type name and specifications of the product.

Problem Probable cause Solution

Trouble with and imperfect contact of communication cable

No response Incorrect communication speed Set the communication speed suitable for

Device address designation differs Make reassignment after checking the

Incorrect data bit configuration Make reassignment after checking the

Transmission line is not set to the receive state after data send

Incorrect identifier Make re-setting after checking the

EOT return

The identifier of a function not added to the controller is specified

BCC error Check BCC of the transmission data.

Check communication cables and connectors.

the host computer by referring to "

Communication speed setting"

device address by referring to

Device address setting"

data bit configuration by referring to "

Data bit configuration setting"

Check a program on the host computer side.

identifier by referring to

Communication identifier list"

"! (P. 28).

(P. 7).

3.4

(P. 9).

"3.3

(P. 11).

3.5

NAK return Data exceeds the setting range Check a data range.

The identifier of a function not added to the controller is specified

Make re-setting after checking the identifier by referring to

Communication identifier list"

"! (P. 28).

IMCB03-E5

7. ASCII 7-BIT CODE TABLE

b700001111

b600110011

b501010101

b5 to b7b4b3b2b1 01234567

00000NULDLE SP 0 @ P ‘ p

00011SOHDC1 ! 1 A Q a q

00102STXDC2 ” 2 B R b r

00113ETXDC3 # 3 C S c s

01004EOTDC4 $ 4 D T d t

01015ENQNAK % 5 E U e u

01106ACKSYM & 6 F V f v

01117BELETB ’ 7 G W g w

(REFERENCE)

10008 BS CAN ( 8 H X h x

10019 HT EM ) 9 I Y i y

1010A LF SUB * : J Z j z

1011B VT ESC + ; K [ k {

1100C FF FS , < L ¥ l |

1101D CR GS - = M ] m }

1110E SO RS . > N ^ n ˜

1111F SI US / ? O _ o DEL

IMCB03-E5

MEMO

IMCB03-E5

The first edition: MAY. 1998 The fifth edition: DEC. 2002 [IMQ00]

RKC INSTRUMENT INC.

HEADQUARTERS: 16-6, KUGAHARA 5-CHOME, OHTA-KU TOKYO 146-8515 JAPAN

PHONE: 03-3751-9799 (+81 3 3751 9799) E-mail: info@rkcinst.co.jp FAX: 03-3751-8585 (+81 3 3751 8585)

IMCB03-E5 DEC. 2002

RKC CB900 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARNING

CAUTION

NOTICE

CONTENTS

1. SPECIFICATIONS

2. WIRING

3. SETTING FOR COMMUNICATION

3.1 Transfer to communication setting mode

3.2 Communication parameter selection

3.3 Device address setting

3.4 Communication speed setting

3.5 Data bit configuration setting

3.6 Interval time setting

3.7 Notes under communication

4. COMMUNICATION PROTOCOL

4.1 Polling

4.1.1 Polling procedure

4.1.2 Polling procedure example (When the host computer requests data)

4.2 Selecting

4.2.1 Selecting procedure

4.2.2 Selecting procedure example (When the host computer sends a set value)

5. COMMUNICATION IDENTIFIER

6. TROUBLESHOOTING