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INST.No. INE-359
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)
Host computer
Host computer
RS-485
Host computer
RS-232C
2. Wiring connection
When using line converter (SC8-10)
• Connector: D sub 25-pin
Connection: RS-232C
Host
computer
SD
2
RD
3
SG
7
FG
1
Shield wire
RS
4
CS
5
DR
6
ER
20
CD
8
D-sub connector 25-pin
GT120 series
Digital Indicating Controller
COMMUNICATIONS INTERFACES
GT120
GT120
No.0
No.1
(Fig. 1-1)
Line converter
SC8-10
232C
485
GT120
(Fig. 1-2)
RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
built-in terminator
3
RS-232C
GT120
No.2
RS-485
GT120
No.0
No.1
SC8-10
RDB(-)
6
4
RDA(+)
5
3
GT8-CDM
RD
1
SD
2
SG
RS-485
(Fig. 2-1)
1
Instruction Manual
GT120
No.30
GT120
No.30
GT120
No.0
No.1
GT8-CDD
No.30
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Related Manuals for Chino GT120 Series
Summary of Contents for Chino GT120 Series
- Page 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.
- Page 2 • Connector: D sub 9-pin Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps) Host SC8-10 computer built-in terminator GT120 No.0 No.1 No.30 RDB(-) RDA(+) Shield wire GT8-CDM GT8-CDD RS-232C RS-485 D-sub connector 9-pin (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.
- Page 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.
- Page 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.
- Page 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. •...
- Page 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.
- Page 7 • A response message from the slave in abnormal status (When a value out of the setting range is set.) Slave Function Abnormal Error check Header Delimiter address code code (3AH) (30H 31H) (38H 36H) (30H 33H) (37H 36H) (0DH 0AH) Number of characters (Fig.
- Page 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.
- Page 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 Modbus command function Data item Data type code 20H/50H 03H/06H 0001H: SV Setting value 20H/50H...
- Page 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 value setting 20H/50H 03H/06H 002AH: Not used 20H/50H 03H/06H 003FH: Not used 20H/50H 03H/06H 0040H: Alarm action Energized/ 0000H: Energized...
- Page 11 0080H: PV (input value) reading Present PV 0081H: MV (manipulated variable) Present MV reading 0082H: Not used 0083H: Not used 0084H: Not used 0085H: OUT status reading 0000 0000 0000 0000 digit: OUT 0: OFF 1: ON digit: Not used (Always 0) digit: Alarm output 0: OFF 1: ON digit: Not used (Always 0)
- Page 12 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 - m a i l : inter@chino.co.jp W e b s i t e : http://www.chino.co.jp/ INE-359 April-'05 GT120 (1 edition) Printed in Japan...
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