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COMMUNICATION INSTRUCTION MANUAL TEMPERATURE CONTROLLER KT4, KT8 and KT9

No.KTC1E6 2009.05

To prevent accidents arising from the misuse of this controller, please ensure the operator receives this manual.

For this product to which communication function has been added, “1” is entered after the heater burnout

alarm indication in the model number.

(For the model number and basic operation, refer to the instruction manual for KT4, KT8 and KT9.)

Warning

Turn the power supply to the instrument off before wiring or checking it.

Working or touching the terminal with the power switched on may result in severe injury or

death due to Electric Shock.

1. Setup of the KT4, KT8 and KT9

Set the items “Communication protocol selection”, “Instrument number setting”, “Communication speed

selection” “Parity selection” and “Stop bit selection” after the “Sensor correction setting” in the Auxiliary

function setting mode 1.

To enter Auxiliary function setting mode 1, press the key for 3 seconds while holding down the

key.

Character

(PV display)

Name, Functions and Setting range

Default

(SV display)

Communication protocol selection Modbus ASCII

• Selects the Communication protocol.

• Modbus ASCII mode:

Modbus RTU mode: : Not available.

Instrument number setting 0

• Sets individual instrument number for each unit when communicating by

connecting plural controllers in serial communication.

Up to 31 units can be connected, however, the instrument number can be set

within the range 0 to 95.

• 0 to 95

Communication speed selection 9600bps

• Selects a communication speed to correspond to that of host computer.

• 2400bps: , 4800bps: , 9600bps: , 19200bps:

Parity selection Even

• Selects the parity.

• No parity: , Even parity: , Odd parity:

Stop bit selection 1

• Selects the stop bit.

• 1 or 2

2. Terminal arrangement

2.1 Terminal arrangement of KT4

OUT1 : Control output 1 (Heating output)

OUT2 : Control output 2 (Cooling output)

RELAY : Relay contact output

V/A : DC voltage output /DC current

output

S : Non-contact relay output

A1 : Alarm 1 output

EVT : Event output (Comprises A2

output and Heater burnout

alarm output)

CT : Current transformer input

TC : Thermocouple

RTD : Resistance Temperature Detector

DC : DC current or DC voltage

RS-485: Serial communication

(Fig. 2.1-1)

Summary of content (12 pages)

PAGE 1
COMMUNICATION INSTRUCTION MANUAL TEMPERATURE CONTROLLER KT4, KT8 and KT9 No.KTC1E6 2009.05 To prevent accidents arising from the misuse of this controller, please ensure the operator receives this manual. For this product to which communication function has been added, “1” is entered after the heater burnout alarm indication in the model number. (For the model number and basic operation, refer to the instruction manual for KT4, KT8 and KT9.
PAGE 2
.2 Terminal arrangement of KT8 and KT9 OUT1 : Control output 1 (Heating output) OUT2 : Control output 2 (Cooling output) RELAY : Relay contact output V/A : Non-contact voltage output /DC current output A1 : Alarm 1 output A2 : Alarm 2 output HB : Heater burnout alarm output SV2 : 2nd main setting CT : Current transformer input TC : Thermocouple RTD : Resistance Temperature Detector DC : DC current or DC voltage RS-485: Serial communication (Fig 2.2-1) 3.
PAGE 3
4. Wiring When using communication converter (RS-232C) • Connector: D-sub 25-pin Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps) Host computer KT4 Shielded wire KT8, KT9 FG Shielded wire FG D-sub 25-pin connector (Fig. 4-1) • Connector: D-sub 9-pin Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps) KT4 Host computer Shielded wire FG KT8, KT9 FG Shielded wire FG D-sub 9-pin connector (Fig.
PAGE 4
Shielded wire Connect only one side of the shielded wire to the FG or GND terminal so that current cannot flow to the shielded wire. (If both sides of the shielded wire are connected to the FG or GND terminal, the circuit will be closed between the shielded wire and the ground. As a result, current will run through the shielded wire and this may cause noise.) Be sure to ground FG and GND terminals.
PAGE 5
Master side (Notice on setting a program) Set the program so that the master can disconnect the transmitter from the communication line within a 1 character transmission period after sending the command in preparation for reception of the response from the slave. To avoid the collision of transmissions between the master and the slave, send the next command after carefully checking that the master received the response. 6. Modbus protocol 6.
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(4) Data Data depends on the function code. A request message from the master is composed of data item, number of data and setting data. A response message from the slave is composed of number of bytes, data and exception code in negative acknowledgement. Effective range of data is –32768 to 32767 (8000H to 7FFFH).
PAGE 7
6.4 RTU mode 8-bit binary data in command is transmitted as it is. Data format Start bit : 1 bit Data bit : 8 bits Parity : Even/No/Odd (Selectable) Stop bit : 1 bit/2 bits (Selectable) Error detection : CRC-16 (Cyclic Redundancy Check) Data interval : 3.5 characters transmission time or less (1) Message configuration RTU mode is configured to start after idle time is processed for more than 3.5 character transmission and end after idle time is processed for more than 3.5 character transmission. (See Fig.
PAGE 8
How CRC is calculated In the CRC system, the information is divided by the polynomial series. The remainder is added to the end of the information and transmitted. The generation of the polynomial series is as follows. (Generation of the polynomial series: X16 + X 15 + X 2 + 1) 1 Initialize the CRC-16 data (assumed as X) (FFFFH). 2 Calculate exclusive OR (XOR) with the 1st data and X. This is assumed as X. 3 Shift X one bit to the right. This is assumed as X.
PAGE 9
7. Communication command table When the data (set value) has a decimal point, remove the decimal point and represent it as a whole number, then express it in hexadecimal figures.
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03H/06H 002BH: Not used 03H/06H 03H/06H 03H/06H 0036H: Not used 0037H: OUT/OFF 0038H: Auto/Manual control 03H/06H 03H/06H 0039H: Manual control MV (manipulated variable) 003AH: Not used 03H/06H 03H/06H 003FH: Not used 0040H: A1 action Energized/Deenergized 03H/06H 0041H: A2 action Energized/Deenergized 03H/06H 03H/06H 03H/06H 0042H: Not used 0043H: Not used 0044H: Input type 03H/06H 0045H: Direct/Reverse action 03H/06H 03H/06H 03H/06H 03H/06H 06H 03H 03H 03H 0046H: Not used 0047H: AT bias 004
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03H 03H 03H 0083H: Not used 0084H: Not used 0085H: OUT status reading 03H 03H 03H 03H 0086H: Not used 0087H: Not used 00A0H: Not used 00A1H: Instrument information reading 0000 0000 0000 0000 215 to 20 0 2 digit: OUT1 0: OFF 1: ON 21 digit: OUT2 0: OFF 1: ON 22 digit: A1 output 0: OFF 1: ON 23 digit: A2 output 0: OFF 1: ON 24 digit: Not used (Always 0) 25 digit: Not used (Always 0) 26 digit: HB (Heater burnout alarm) output 0: OFF 1: ON (When sensor burnout, 0: OFF) 27 digit: LA (Loop break alarm) outpu
PAGE 12
Notice When data setting is changed by front keypad operation, the data that is related to the changed item is also changed automatically as shown in Example 1 below. However, when the data setting is changed by communication function, the related data does not change as shown in Example 2 below. (Only the changed data is altered.) (Example 1) SV high limit: 1370 SV : 1000 When SV high limit is changed to 800 by the front keypad operation, both SV high limit and SV are changed to 800 .