Chino GT120 Series User manual

1
INST.No. INE-359
GT120 series
Digital Indicating Controller
COMMUNICATIONS INTERFACES
Instruction Manual
To prevent accidents arising from the misuse of this controller, please ensure the operator using it receives
this manual.
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. System configuration
RS-485 multi-drop connection communication (Option)
(Fig. 1-1)
(Fig. 1-2)
2. Wiring connection
When using line converter (SC8-10)
• Connector: D sub 25-pin
Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
(Fig. 2-1)
Host com
p
uter
GT120
No.0 No.1 No.30
GT8-CDD
GT8-CDM Shield wire
SD 2
RD 3
SG 7
FG 1
RS 4
CS 5
DR 6
ER 20
CD 8
Host
com
p
uter
D-sub connector 25-
p
in
4
3
RS-232C RS-485
SC8-10
RDA(+)
5
RDB(-)
6
SD
2
SG
3
RD
1
built-in terminator
RS-485
No.0
GT120
No.1
GT120
No.2
GT120
No.30
GT120
Host com
p
uter
RS-485
Host com
p
uter
RS-232C
Line converter
232C 485
SC8-10
No.30
GT120
No.0
GT120
No.1
GT120

2
• Connector: D sub 9-pin
Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
(Fig. 2-2)
Shield wire
Connect only one side of the shield wire to the FG or GND terminal so that current cannot flow to
the shield wire.
(If both sides of the shield wire are connected to the FG or GND terminal, the circuit will be closed
between the shield wire and the ground. As a result, current will run through the shield wire and this
may cause noise.)
Never fail to ground FG and GND terminals.
Terminator (Terminal resistor)
Do not connect terminator with the communication line because each GT120 has built-in pull-up
and pull-down resistors instead of a terminator.
SC8-10 (sold separately) is available as a line converter (RS232C/RS485 Signal converting unit).
3. Setup of the GT120
• It is necessary to set the instrument number individually to the GT120 when communicating by
connecting plural units in serial communication (option).
Select a communication speed of the GT120 in accordance with that of the host computer.
• For the instrument number setting and communication speed selection, refer to the instruction manual
for GT120.
4. Communication procedure
Communication starts with command transmission from the host computer (hereafter Master) and
ends with the response of the GT120 (hereafter Slave).
• Response with data
When the master sends the reading command, the slave
responds with the corresponding setting value or current
status.
• Acknowledgement
When the master sends the setting command, the slave
responds by sending the acknowledgement after the
processing is terminated.
• Negative acknowledgement
When the master sends non-existent command or value
out of the setting range, the slave returns the negative
acknowledgement.
• No response
The slave will not respond to the master when global address
is set, or when there is a communication error ( framing error or
checksum error), or when LRC or CRC discrepancy is detected.
(Fig.4-1)
Command
Data
Command
Acknowledgement
Command
Negative
acknowledgement
Command
No response
Master Slave
GT120
No.0 No.1 No.30
GT8-CDD
GT8-CDM
Shield wire
SC8-10
RS-232C RS-485
RDB(-)
RDA(+)
5
6
SD
2
SG
3
RD
1
built-in terminator
4
3
RD
SG
SD
ER
DR
RS
CS
3
2
5
1
4
6
7
8
9
Host
com
p
uter
D-sub connector 9-
p
in

3
Communication timing of the RS-485 (option)
Slave side
When the slave starts transmission to RS-485 communication line, the slave is arranged so as to
provide an idle status (mark status) transmission period of 1 or more characters before sending
the response to ensure the synchronization on the receiving side.
The slave is arranged so as to disconnect the transmitter from the communication line within a
1 character transmission period after sending the response.
Master side (Notice on programming)
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.
5. Private protocol
5.1 Transmission mode
Private protocol is composed of ASCII codes.
Hexadecimal (0 to 9, A to F), which is divided into high order (4-bit) and low order (4-bit) out of
8-bit binary data in command is transmitted as ASCII characters.
Data format Start bit : 1 bit
Data bit : 7 bits
Parity :Even
Stopbit :1bit
Error detection: Checksum
5.2 Command configuration
All commands are composed of ASCII. The data (setting value, decimal number) is represented with
hexadecimal number, and ASCII code is used.
The negative numbers are represented with 2's complement.
(1) Setting command
(Fig. 5.2-1)
(2) Reading command
(Fig. 5.2-2)
(3) Response with data
(Fig. 5.2-3)
(4) Acknowledgement
(Fig. 5.2-4)
(5) Negative acknowledgement
(Fig.5.2-5)
Header : Control code to represent the beginning of the command or the response.
ASCII codes are used.
Setting command, Reading command : 02H fixed
Response with data, Acknowledgement: 06H fixed
Negative acknowledgement : 15H fixed
11 14 1241
Address Command
type (50H)
Data
item Checksum Delimitter
(03H)
Header
(02H)
Sub
address
(20H) Data
Number of
characters
11 14 121
Command
type (20H)
Data
item Checksum Delimitter (03H)
Header
(02H) Number of
characters
Sub
address
(20H)
Address
11 14 1241
Command
type (20H)
Data
item Checksum Delimitter (03H)
Header
(06H) Data Number of
characters
Address Sub
address
(20H)
11 12
Address Checksum Delimitter
(03H)
Header
(06H) Number of
characters
11 2 11
Address Checksum Delimiter
(03H)
Header
(15H)
Error
code Number of
characters

4
Address : Numbers by which the master discerns each slave.
Instrument number 0 to 94 (00H to 5EH) and Global address 95 (7FH)
The numbers (20H to 7EH) are used by giving 20H of bias, because 00H to 1FH
are used for control code.
95 (7FH) is called Global address, which is used when the same command
is sent to all the slaves connected. However, the response is not returned.
Sub address : 20H fixed
Command type : Code to discern Setting command (50H) and Reading command (20H)
Data item : Data classification of the command object
Composed of hexadecimal 4 digits (Refer to the Communication command table)
Data : The contents of data (setting value) depends on the setting command
Composed of hexadecimal 4 digits (Refer to the Communication command table)
Checksum : 2-character data to detect communication errors
Delimiter : Control code to represent the end of command
03H fixed
Error code : Represents an error type. Composed of hexadecimal 1 digit.
1 (31H)-----Non-existent command
2 (32H)-----Not used
3 (33H)-----Setting outside the setting range
4 (34H)-----Status unable to set (e.g. AT is performing)
5 (35H)-----During setting mode by keypad operation
5.3 Checksum calculation
Checksum is used to detect receiving errors in the command or data.
Set the program for the master side as well to calculate the checksum of the response
data from the slaves so that the communication errors can be checked.
The ASCII code (hexadecimal) which corresponds to the characters ranging from the address
to that before the checksum is converted to binary notation, and the total value is calculated.
The lower 2-digits of the total value are converted to 2’s complements and then to hexadecimal
number, that is, ASCII code for the checksum.
Checksum calculation example
Main setting value: 600 (0258H)
Address (instrument number): 0 (20H)
• 1’s complement: Make each bit of binary 0 and 1 reverse.
• 2’s complement: Add 1 to 1’s complement.
5.4 Contents of the command
Notes on the setting command and reading command
• Possible to set the setting value by setting command of the communication function
even if the setting value is locked.
• Although the options are not applied, setting the items for the options is possible by the setting
command, however, they will not function.
STX ETX
P00010258
02H 20H 20H 50H 30H 30H 30H 31H 30H 32H 35H 38H 03H
[Characters above are represented by ASCII]
Checksum
Checksum calculation range
[e.g.]
E
45H 30H
0
20H
20H
50H
30H
30H
30H
31H
30H
32H
35H
38H
0010 0000
0010 0000
0101 0000
0011 0000
0011 0000
0011 0000
0011 0001
0011 0000
0011 0010
0011 0101
0011 1000
+
10 0010 0000
[Hexadecimal] [Binary]
1101 1111
1
+
1110 0000
E0
45H 30H
[1's complement]
[2's complement]
[Hexadecimal]
[ASCII]
Checksum

5
• The memory can store up to 1,000,000 (one million) entries.
If the number of setting times exceeds the limit, it cannot memorize the data. So frequent
transmission via communication is not recommended.
• When connecting plural slaves, the address (instrument number) must not be duplicated.
• When sending a command by Global address [95 (7FH)], the same command is sent to all the
slaves connected. However, the response is not returned.
• The instrument number and communication speed of the slave cannot be set by communication.
Setting command
• The settable range is the same as the one by keypad operation.
For communication command, refer to the communication command table of this manual.
• All commands are composed of ASCII.
• The data (setting value, decimal) is converted to hexadecimal figures, and ASCII is used.
The negative number is represented with 2's complement. When the data (setting value) has
a decimal point, the whole number without a decimal point is used.
Reading command
• All commands are composed of ASCII.
• The data (setting value, decimal) is converted to hexadecimal figures, and ASCII is used.
The negative number is represented by 2's complement. When the data (setting value) has
a decimal point, the response is returned as a whole number without a decimal point.
6. Modbus protocol
6.1 Transmission mode
There are 2 transmission modes (ASCII and RTU) in Modbus protocol.
6.2 ASCII mode
Hexadecimal (0 to 9，A to F), which is divided into high order (4-bit) and low order (4-bit) out of
8-bit binary data in command is transmitted as ASCII characters.
Data format Start bit : 1 bit
Data bit : 7 bits
Parity : Even/No/Odd (Selectable)
Stop bit : 1 bit/2 bits (Selectable)
Error detection: LRC (Longitudinal Redundancy Check)
Data interval : 1 second or less
(1) Message configuration
ASCII mode message is configured to start by [: (colon)(3AH)] and end by [CR (carriage return)
(0DH) + LF (Line feed)(0AH)]. (See Fig. 6.2-1)
(Fig. 6.2-1)
(2) Slave address
Slave address is an individual instrument number on the slave side and is set within the range
00H to 5FH (0 to 95).
The master identifies slaves by the slave address of the requested message.
The slave informs the master which slave is responding to the master by placing its own address
in the response message.
[Slave address 00H (broadcast address) can identify all the slaves. However slaves do not respond.]
(3) Function code
The function code is the command code for the slave to undertake the following action types (Table 6.2-1).
(Table 6.2-1)
Function code Contents
03 (03H) Reading the setting value and information from slaves
06 (06H) Setting to slaves
Function code is used to discern whether the response is normal (acknowledgement) or if any error
(negative acknowledgement) is occurred when the slave returns the response message to the master.
When acknowledgement is returned, the slave simply returns the original function code.
When negative acknowledgement is returned, the MSB of the original function code is set as 1
for the response.
(For example, when the master sends request message setting 10H to function code by mistake,
slave returns 90H by setting the MSB to 1, because the former is an illegal function.)
For negative acknowledgement, abnormal code (Table 6.2-2) below is set to the data of response
message and returned to the master in order to inform it that what kind of error has occurred.
Slave
address
Function
code Data Error check LRC
Delimiter
(CR)
Header
(:)
Delimiter
(LF)

6
(Table 6.2-2)
Abnormal code Contents
1 (01H) Illegal function (Non-existent function)
2 (02H) Illegal data address (Non-existent data address)
3 (03H) Illegal data value (Value out of the setting range)
17 (11H) Illegal setting (Unsettable status)
18 (12H) Illegal setting (During setting mode by key operation, etc)
(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 abnormal code
in negative acknowledgement. Effective range of data is –32768 to 32767 (8000H to 7FFFH).
(5) Error check of ASCII mode
After calculating LRC (Longitudinal Redundancy Check) from the slave address to the end of data,
the calculated 8-bit data is converted to two ASCII characters and are appended to the end of
message.
How LRC is calculated
1Create a message in RTU mode.
2Add all the values from the slave address to the end of data. This is assumed as X.
3Make a complement for X (bit reverse). This is assumed as X.
4Add a value of 1 to X. This is assumed as X.
5Set X as an LRC to the end of the message.
6Convert the whole message to ASCII characters.
(6) Message example of ASCII mode
1 Reading (Instrument number 1, SV)
• A request message from the master
(Fig. 6.2-2)
The number of data means the data item to be read, and it is fixed as (30H 30H 30H 31H).
• A response message from the slave in normal status (When SV=100 )
(Fig.6.2-3)
The number of response bytes means the number of bytes of the data which has been read, and
it is fixed as (30H 32H).
• A response message from the slave in abnormal status (When non-existent data item is sent)
(Fig. 6.2-4)
The function code MSB is set to 1 for the response message in abnormal status (83H).
The abnormal code (02H: Non-existent data address) is returned as contents of error.
2 Setting (Instrument number 1, SV=100 )
• A request message from the master
(Fig. 6.2-5)
• A response message from the slave in normal status
(Fig. 6.2-6)
Slave
address
Function
code Data item Error check LRC DelimiterHeader
(30H 31H)
Number of
data
(3AH)
12 2 4 4 2 2
(30H 33H) (30H 30H 30H 31H) (30H 30H 30H 31H) (46H 41H) (0DH 0AH) Number of
characters
Slave
address
Function
code
Number of
response bytes
Error check
LRC DelimiterHeader Data
12224 22
(3AH) (30H 31H) (30H 33H) (30H 32H) (30H 30H 36H 34H) (39H 36H) (0DH 0AH) Number of
characters
(0DH 0AH)
Slave
address
Function
code
Abnormal
code
Error check
LRC DelimiterHeader
1222 22
Number of
characters
(3AH) (30H 31H) (38H 33H) (30H 32H) (37H 41H)
Slave
address
Function
code Data item Error check
LRC DelimiterHeader
(30H 31H)
Data
(3AH)
12 2 4 4 2 2
Number of
characters
(30H 36H) (30H 30H 30H 31H) (30H 30H 36H 34H) (39H 34H) (0DH 0AH)
Slave
address
Function
code Data item Error check
LRC DelimiterHeader Data
12244 22
Number of
characters
(3AH) (30H 31H) (30H 36H) (30H 30H 30H 31H)(30H 30H 36H 34H) (39H 34H) (0DH 0AH)

7
• A response message from the slave in abnormal status (When a value out of the setting range
is set.)
(Fig. 6.2-7)
The function code MSB is set to 1 for the response message in abnormal status (86H).
The abnormal code (03H: Value out of the setting range) is returned as contents of error.
6.3 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. 6.3-1)
(Fig. 6.3-1)
(2) Slave address
Slave address is an individual instrument number on the slave side and is set within the range
00H to 5FH (0 to 95).
The master identifies slaves by the slave address of the requested message.
The slave informs the master which slave is responding to the master by placing its own address
in the response message.
[Slave address 00H (broadcast address) can identify all the slaves. However slaves do not respond.]
(3) Function code
The function code is the command code for the slave to undertake the following action types (Table
6.3-1).
(Table 6.3-1)
Function code Contents
03 (03H) Reading the setting value and information from slaves
06 (06H) Setting to slaves
Function code is used to discern whether the response is normal (acknowledgement) or if any error
(negative acknowledgement) is occurred when the slave returns the response message to the master.
When acknowledgement is returned, the slave simply returns the original function code.
When negative acknowledgement is returned, the MSB of the original function code is set as 1
for the response.
(For example, when the master sends request message setting 10H to function code by mistake,
slave returns 90H by setting the MSB to 1, because the former is an illegal function.)
For negative acknowledgement, abnormal code (Table 6.3-2) below is set to the data of response
message and returned to the master in order to inform it that what kind of error has occurred.
(Table 6.3-2)
Abnormal code Contents
1 (01H) Illegal function (Non-existent function)
2 (02H) Illegal data address (Non-existent data address)
3 (03H) Illegal data value (Value out of the setting range)
17 (11H) Illegal setting (Unsettable status)
18 (12H) Illegal setting (During setting mode by keypad operation, etc)
(4) Data
Data depends on the function code.
A request message from the master side is composed of data item, number of data and setting data.
A response message from the slave side is composed of number of bytes, data and abnormal code
in negative acknowledgement. Effective range of data is –32768 to 32767 (8000H to 7FFFH).
3.5 idle
characters
Slave
address
Function
code Data Error check
CRC
3.5 idle
characters
Slave
address
Function
code
Abnormal
code
Error check
LRC DelimiterHeader
2
Number of
characters
2
2221
(3AH) (30H 31H) (38H 36H) (30H 33H) (37H 36H) (0DH 0AH)

8
(5) Error check of RTU mode
After calculating CRC-16 (Cyclic Redundancy Check) from the slave address to the end of data, the
calculated 16-bit data is appended to the end of message in sequence from low order to high order.
How CRC is calculated
In the CRC system, the information is divided by the polynomial. The remainder is added to the
end of the information and transmitted. The generation of polynomial is as follows.
(Generation of polynomial: X16 + X 15 + X 2 + 1)
1 Initialize the CRC-16 data (assumed as X) (FFFFH).
2Calculate exclusive OR (XOR) with the 1st data and X. This is assumed as X.
3Shift X one bit to the right. This is assumed as X.
4When a carry is generated as a result of the shift, XOR is calculated by X of 3and the fixed
value (A001H). This is assumed as X. If a carry is not generated, go to step 5.
5Repeat steps 3and 4until shifting 8 times.
6XOR is calculated with the next data and X. This is assumed as X.
7Repeat steps 3to 5.
8Repeat steps 3to 5up to the last data.
9Set X as CRC-16 to the end of message in sequence from low order to high order.
(6) Message example of RTU mode
1Reading (Instrument number 1, SV)
• Request message from the master
(Fig. 6.3-2)
The number of data means the data item to be read, and it is fixed as 0001H.
• Response message from the slave in normal status (When SV=100 )
(Fig. 6.3-3)
The number of response byte means number of bytes of the data which has been read, and it is
fixed as 02H.
• Response message from the slave in abnormal status (When data item is mistaken)
(Fig. 6.3-4)
The function code MSB is set to 1 for the response message in abnormal status (83H).
The abnormal code (02H: Non-existent data address) is returned as contents of error.
2Setting (Instrument number 1, SV=100 )
• Request message from the master
(Fig. 6.3-5)
• Response message from the slave in normal status
(Fig. 6.3-6)
• Response message from the slave in abnormal status (When a value out of the setting
range is set)
(Fig. 6.3-7)
The function code MSB is set to 1 for the response message in abnormal status (86H).
The abnormal code (03H: Value out of the setting range) is returned as contents of error.
3.5 idle
characters
Slave
address
Function
code Data item Error check CRC
3.5 idle
characters
(01H) (03H) (0001H)
Number of
data
(0001H) (D5CAH)
11 2 2 2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Number of
response bytes
Error check
CRC
3.5 idle
characters
(01H) (03H) (02H)
Data
(0064H) (B9AFH)
11 1 2 2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Abnormal
code
Error check
CRC
3.5 idle
characters
(01H) (83H) (02H) (C0F1H)
11 1 2
Number of
characters
3.5 idle
characters
Slave
address
Function
code Data item Error check CRC
3.5 idle
characters
(01H) (06H) (0001H)
Data
(0064H) (D9E1H)
11 2 2 2
Number of
characters
3.5 idle
characters
Slave
address
Function
code Data item Error check
CRC
3.5 idle
characters
(01H) (06H) (0001H)
Data
(0064H) (D9E1H)
11 2 2 2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Abnormal
code
Error check
CRC
3.5 idle
characters
(01H) (86H) (03H) (0261H)
11 1 2
Number of
characters

9
7. Communication command table
When the data (setting value) has a decimal point, remove the decimal point and represent it as a
whole number, then express it in hexadecimal figures.
Private
command
type
Modbus
function
code
Data item Data
20H/50H 03H/06H 0001H: SV Setting value
20H/50H 03H/06H 0002H: Not used
20H/50H 03H/06H 0003H: AT setting 0000H: Cancel 0001H: Perform
20H/50H 03H/06H 0004H: OUT proportional band setting Setting value
20H/50H 03H/06H 0005H: Not used
20H/50H 03H/06H 0006H: Integral time setting Setting value
20H/50H 03H/06H 0007H: Derivative time setting Setting value
20H/50H 03H/06H 0008H: OUT pulse cycle setting Setting value
20H/50H 03H/06H 0009H: Not used
20H/50H 03H/06H 000AH: Manual reset setting Setting value
20H/50H 03H/06H 000BH: Alarm setting Setting value
20H/50H 03H/06H 000CH: Not used
20H/50H 03H/06H 000DH: Not used
20H/50H 03H/06H 000EH: Not used
20H/50H 03H/06H 000FH: HB (
Heater disconnection alarm
)
setting
Setting value
20H/50H 03H/06H 0010H: LA (Loop break alarm) time
setting
Setting value
20H/50H 03H/06H 0011H: LA (Loop break alarm) span
setting
Setting value
20H/50H 03H/06H 0012H: Setting value lock selection
(*1)
0000H: Unlock 0002H: Lock 2
0001H: Lock 1 0003H: Lock 3
20H/50H 03H/06H 0013H: Not used
20H/50H 03H/06H 0014H: Not used
20H/50H 03H/06H
0015H: Sensor correction value setting Setting value
20H/50H 03H/06H 0016H: Not used
20H/50H 03H/06H 0017H: Not used
20H/50H 03H/06H 0018H: Scaling high limit setting Setting value
20H/50H 03H/06H 0019H: Scaling low limit setting Setting value
20H/50H 03H/06H 001AH: Decimal point place selection 0000H: XXXX (No decimal point)
0001H: XXX.X (1 digit after decimal
point)
0002H: XX.XX (2 digits after decimal
point)
0003H: X.XXX (3 digits after decimal
point)
20H/50H 03H/06H 001BH: PV filter time constant setting Setting value
20H/50H 03H/06H 001CH: OUT high limit setting Setting value
20H/50H 03H/06H 001DH: OUT low limit setting Setting value
20H/50H 03H/06H 001EH: OUT ON/OFF action
Hysteresis setting
Setting value
20H/50H 03H/06H 001FH: Not used
20H/50H 03H/06H 0022H: Not used
20H/50H 03H/06H 0023H: Alarm action selection (*2) 0000H: No alarm action
0001H: Deviation high alarm
0002H: Deviation low alarm
0003H:
Absolute value deviation high alarm
0004H:
Absolute value deviation low alarm
0005H: Absolute value high alarm
0006H: Absolute value low alarm
0007H:
Deviation high alarm with standby
0008H:
Deviation low alarm with standby
0009H:
Absolute value deviation high
alarm with standby
20H/50H 03H/06H 0024H: Not used

10
20H/50H 03H/06H 0025H: Alarm deadband setting Setting value
20H/50H 03H/06H 0026H: Not used
20H/50H 03H/06H 0027H: Not used
20H/50H 03H/06H 0028H: Not used
20H/50H 03H/06H 0029H: Alarm action delayed timer
setting
Setting value
20H/50H 03H/06H 002AH: Not used
20H/50H 03H/06H 003FH: Not used
20H/50H 03H/06H 0040H: Alarm action Energized/
Deenergized selection
0000H: Energized
0001H: Deenergized
20H/50H 03H/06H 0041H: Not used
20H/50H 03H/06H 0042H: Alarm HOLD function selection 0000H: HOLD function not applied
0001H: HOLD function applied
20H/50H 03H/06H 0043H: Not used
20H/50H 03H/06H 0044H: Input type selection 0000H: K [–200 to 1370 ]
0001H: K [–199.9 to 400.0 ]
0002H: J [–200 to 1000 ]
0003H: R [0 to 1760 ]
0004H: S [0 to 1760 ]
0005H: B [0 to 1820 ]
0006H: E [–200 to 800 ]
0007H: T [–199.9 to 400.0 ]
0008H: N [–200 to 1300 ]
0009H: PL- [0 to 1390 ]
000AH: C (W/Re5-26) [0 to 2315 ]
000BH: Pt100 [–199.9 to 850.0 ]
000CH: JPt100 [–199.9 to 500.0 ]
000DH: Pt100 [–200 to 850 ]
000EH: JPt100 [–200 to 500 ]
000FH: K [–320 to 2500 ]
0010H: K [–199.9 to 750.0 ]
0011H: J [–320 to 1800 ]
0012H: R [0 to 3200 ]
0013H: S [0 to 3200 ]
0014H: B [0 to 3300 ]
0015H: E [–320 to 1500 ]
0016H: T [–199.9 to 750.0 ]
0017H: N [–320 to 2300 ]
0018H: PL- [0 to 2500 ]
0019H: C (W/Re5-26) [0 to 4200 ]
001AH: Pt100 [–199.9 to 999.9 ]
001BH: JPt100 [–199.9 to 900.0 ]
001CH: Pt100 [–300 to 1500 ]
001DH: JPt100 [–300 to 900 ]
001EH: 4 to 20mA DC[–1999 to 9999]
001FH: 0 to 20mA DC[–1999 to 9999]
0020H: 0 to 1V DC [–1999 to 9999]
0021H: 0 to 5V DC [–1999 to 9999]
0022H: 1 to 5V DC [–1999 to 9999]
0023H: 0 to 10V DC [–1999 to 9999]
20H/50H 03H/06H 0045H: Direct/Reverse action selection 0000H: Heating (Reverse action)
0001H: Cooling (Direct action)
20H/50H 03H/06H 0046H: Not used
20H/50H 03H/06H 0047H: AT bias setting Setting value
20H/50H 03H/06H 0048H: ARW (anti-reset windup)
setting
Setting value
20H/50H 03H/06H 006FH: Key Lock selection 0000H: Key enabled
0001H: Key Lock
50H 06H 0070H: Key operation change flag
clearing
0000H: No action
0001H: All clearing

11
20H 03H 0080H: PV (input value) reading Present PV
20H 03H 0081H: MV (manipulated variable)
reading
Present MV
20H 03H 0082H: Not used
20H 03H 0083H: Not used
20H 03H 0084H: Not used
20H 03H 0085H: OUT status reading 0000 0000 0000 0000
215 to 2
0
20digit: OUT
0:OFF 1:ON
21digit: Not used (Always 0)
22digit: Alarm output
0:OFF 1:ON
23digit: Not used (Always 0)
24digit: Not used (Always 0)
25digit: Not used (Always 0)
26digit: HB
(Heater disconnection alarm)
output
0:OFF 1:ON
(When sensor burnout,
0: OFF)
27digit: LA (Loop break alarm)
output
0:OFF 1:ON
28digit: Overscale
0:OFF 1:ON
29digit: Underscale
0: OFF 1: ON
210 digit: Not used (Always 0)
211 digit: AT
0: OFF 1: ON
212 digit: Not used (Always 0)
213 digit: Converter function
0: Controller 1: Converter
214 digit: Not used (Always 0)
215 digit: Key operation change
0:No 1:Yes
20H 03H 0086H: Not used
20H 03H 0087H: Not used
20H 03H 00A0H: Not used
20H 03H 00A1H: Instrument information reading 0000 0000 0000 0000
215 to 2
0
20digit: Not used (Always 0)
21digit: Not used (Always 0)
22digit: Alarm function
0: Not applied
1: Applied
23digit: Not used (Always 0)
24digit: Not used (Always 0)
25digit: Not used (Always 0)
26digit: HB
(Heater disconnection alarm)
0: Not applied
1: Applied
27digit: LA (Loop break alarm)
0: Not applied
1: Applied
28to 215 digit: Not used (Always 0)
(*1) When Lock 3 is designated, the set data is not saved in the memory.
This is why the setting value reverts to the one before Lock 3 when power is turned OFF.
(*2) When alarm action type is changed, the alarm setting value reverts to the default value and
alarm output status is also initialized.

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) Scaling high limit: 1370
SV : 1000
When Scaling high limit is changed to 800 by the front keypad operation, both Scaling
high limit and SV are changed to 800 .
(Example 2) Scaling high limit: 1370
SV : 1000
When Scaling high limit is changed to 800 by communication function, Scaling high
limit is changed to 800 , however, SV is maintained at the same temperature 1000 .
8. Specifications
Cable length : Maximum communication distance 1.2km
Cable resistance: Within 50 (Terminator is not necessary or
120 or greater on one side.)
Communication line : Based on EIA RS-485
Communication : Half-duplex
Communication speed : 9600bps (2400, 4800, 9600, 19200bps) Selectable by keypad operation
Synchronous system : Start-stop synchronous
Code form : ASCII, binary
Error correction : Command request repeat system
Error detection : Parity check, Checksum (LRC), CRC
Data format Start bit : 1
Databit:7,8
Parity :Even,Odd,Noparity
Stopbit:1
9. Troubleshooting
If any malfunctions occur, refer to the following items after checking the power supply to the master
and the slave.
• Problem: If it is unable to communicate
Check the following
The connection or wiring of communication is not secure.
Burnout or imperfect contact on the communication cable and the connector.
Communication speed of the slave does not coincide with that of the master.
The data bit, parity and stop bit of the master do not accord with those of the slave.
The instrument number of the slave does not coincide with that of the command.
The instrument numbers are duplicated in multiple slaves.
Make sure that the program is appropriate for the transmission timing.
• Problem: Though it is able to communicate, the response is 'NAK'.
Check the following
Check whether a non-existent command code has been sent or not.
The setting command data exceeds the setting range of the slave.
The controller cannot be set when such as AT is performing.
The operation mode is under the front keypad operation setting mode.
32-8, KUMANO-CHO, ITABASHI-KU, TOKYO 173-8632
Telephone : + 81-3-3956-2171
Facsimile : + 81-3-3956-0915
E-mail : [email protected]
Website : http://www.chino.co.jp/
INE-359 April-'05 GT120 (1st edition) Printed in Japan