Chino LT830 Series Instructions Manual Download Page 12 | Manualshive

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Chino LT830 Series Instructions Manual Download Page 12

−10−

5.3 RS-485 Connections

This paragraph describes the method of connecting the RS-485 communications interface to the
personal computer by using the line converter (Model SC8-10: sold separately). Since the line
converter and the personal computer use three control signal of Send, Receive and Signal ground
only. Since general personal computers are controlled by control signals, the computer does not
function by only connecting three signal cables without wiring processing inside the connectors.
Wiring processing depends upon the control signals being controlled by the personal computer. For
details, read the instruction manual for the personal computer used.
[please refer to the following instruction manual for line converter (Model SC8-10: sold separately).]

9-pin connector

SD

RD

SG

１

２

３

４

５

６

７

８

RDA

RDB

LT830

LT830

LT830

Termination

resistor 100

Ω

Line converter

In case of RS-485

SA

SG

SA

SB

SG

６

６

７

SB

７

８

８

６

７

SA

SB

SG

８

６７８９

１２３４５

CS ER

DR RS

Please do not connect SG line to FG
terminal or the grounding terminal of
apparatus.

Caution

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Summary of Contents for LT830 Series

Page 1: ...0 Please make sure that this manual is handed to the final user of the instrument COMMUNICATIONS INTERFACES LT830 SERIES Retain this manual apart from the instrument and in an easily DIGITAL INDICATING CONTROLLER ...

Page 2: ...ns Cables 8 5 3 RS 485 Connections 10 6 MODBUS PROTOCOL 11 6 1 Message Transmission Modes 12 6 2 Data Time Interval 13 6 3 Message Configuration 13 6 4 Creating a Message 22 6 5 Function Code 24 6 6 Processing in Abnormal Status 28 6 7 Table of LT830 Reference 30 6 8 Table of Input types SV_Dot 34 6 9 Remote SV Setting Through Communication 34 7 COMMUNICATIONS TRANSMISSION AND COMMUNICATIONS REMOT...

Page 3: ...ual No LT8 11 2 SC8 10 Line Converter Manual No SC8 10 Also refer to the instruction manual of the computer being used 2 Caution Display This manual contains explanation of precautions Observe these precautions when operating and handling the communications interfaces otherwise the instrument may be damaged resulting in a deterioration in its performance or operation failures may also occur 1 The ...

Page 4: ...heck the specifications and transmission procedures in advance of units being connected However if the counter unit is for a personal computers or similar device which can optionally program the specifications then all the units can be combined by having proper programs prepared by a program designer In addition when a RS 232C standard is investigated the method of having JIS C 6361 referred to is...

Page 5: ...tocol Communications function Instrument No Transmission speed and Character Operation screen Mode 1 Mode 6 Remote Local Digital transmission Remote shift Protocol Press 2 seconds at any screen to go back to mode 6 Character Transmission speed Instrument No function When you set the parameter writing set the key lock at first LT830 controller is always ready for communication It responds at anytim...

Page 6: ...s to register Kind Function Protocol Details Default Upper Communication Set up the upper communication when you communicate with the personal computer Communications Transmission MODBUS By setting up trs 2 at communications transmission the transmitting date at LT830 will be sent to LT830 that was set up with CoM It also transmits SV No and Run Ready information See ７ Communications Transmission ...

Page 7: ...Transmission speed rAtE Operate LT830 and personal computer by the same Transmission speed Usually the default 9600 bps is fine 1 Press to display see 2 Choose the Transmission speed by pressing or then press to register Transmission speed 9600 19200 19 2k bps default is 9600 bps 4 5 Setting of Character CHAr 1 Press to display 2 Choose the character by pressing or then press to register Kind Bit ...

Page 8: ...each instrument is option but the total extension distance of cable is within 1 2km Line converter the final end of LT830 controllers RS 485 SA SB SG Total extension of cable Within 1 2km Line converter ＬＴ８３０ RS 485 SG SB SA About 200 The communications cable is included with the socket Connector LT830 side Green SG White SB Black SA The cable end is solder plated Please prepare an extendable cabl...

Page 9: ...lation sleeve The terminal screws of LT830 controllers and line converters are M3 5mm 5 1 5 Mount an insulation resistor For using the RS 485 communications interface mount a 100 Ω resistor to the LT830 controller connected at the final end For details see Section 5 3 A general metal film resistor can be used The resistor sold separately is available at CHINO 5 1 6 Number of LT230 controllers conn...

Page 10: ...nal wiring Type code RZ CRS6 Cable length of 1 to 15 m To be specified 2 Connection between PC with 25 pin terminal and line converter Cable 25 pin connector RS 232C cable with O shaped crimp terminal Style Internal wiring Type code RZ CRS2 Cable length of 1 to 15 m To be specified 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 RD SD SG 25 pinconnector to PC To line converter In...

Page 11: ...gth of 1 to 200 m To be specified 2 Connection between LT830 controller and LT230 controller Cable O shaped crimp terminal RS 485 cable with O shaped crimp terminal for parallel connection Style The cable consists of a twisted dual core CVVS wires with SG signal grounding wire at both ends Internal wiring Type code RZ CSS1Z2 0 2m or RZ LEC For parallel connection Cable length of 1 to 200 m To be s...

Page 12: ...ing three signal cables without wiring processing inside the connectors Wiring processing depends upon the control signals being controlled by the personal computer For details read the instruction manual for the personal computer used please refer to the following instruction manual for line converter Model SC8 10 sold separately 9 pin connector SD RD SG １２３４５６７８ RDA RDB LT830 LT830 LT830 ...

Page 13: ...Don t disconnect or short any cables or instruments constituting the serial interface or turn the power on or off during communications Don t disconnect or short any cables or instruments constituting the serial interface or turn the power on or off during communications or the operation may stop or lead to a malfunction When this happens all the components of the serial interface must be reset to...

Page 14: ...Message stop code None CR LF Data time interval 28 bit time or less 1 second or less 6 1 1 Transmitted data The RTU mode data is transmitted in binary numbers In ASCII mode the 8 bit binary data of RTU is separated into higher order 4 bits and lower order 4 bits and both are turned into characters 0 9 A F Example RTU mode ASCII mode 67H 36H 6 89H 37H 7 ABH 38H 8 39H 9 41H A 42H B Length of the RTU...

Page 15: ...ave address The slave address can be programmed in advance by key operation within a range between 1 and 99 The master unit usually communicates with one slave unit While messages from the master unit are received commonly by all the units in connection only the slave unit corresponding to the slave address included in the command message responds to the message sent The slave address 0 is used fo...

Page 16: ...consists of 16 bit integers with or without codes depending on individual data It is thus configured as integers with their decimal places assigned to separate addresses or normalized with the upper and lower limits specified by the scale with fixed decimal places The LT830 controllers employ the system of assigning the decimal places to separate addresses 6 3 4 Reference Nos Data in the LT830 con...

Page 17: ...Measured data PV SV MV Run parameter Event status 30101 to 30142 04 READ Section 6 7 2 P 32 to 33 Analog parameter Set up parameter Linear decimal point One kind parameter Control output at Ready SV rise ramp SV fall ramp PV start No 1 No 2parameter SV EV1 EV2 setting P I D Output limiter L Output limiter H Variation limiter Instrument Operation Key lock Run ready Remote SV setting 40008 40114 to ...

Page 18: ...om its slave address to its end is calculated in the following procedure 1 Initialize the CRC 16 data assumed as X FFFFH 2 Exclusive logical sum EX OR between data 1 and X X 3 Shift X one bit to the right X 4 When a carry is generated take A001H and EX OR If not go to 5 X 5 Repeat 3 and 4 until shifting 8 times 6 EX OR between the next data and X X 7 Same as 3 to 5 8 Repeat up to the last data 9 C...

Page 19: ...t usErrChkData int iDummy usCrcData 0xffff printf Hex DATA q END n while scanf x usData 0 usCrcData usData usCrcData for iLoopCnt 0 iLoopCnt 8 iLoopCnt if usCrcData 0x0001 usCrcData usCrcData 1 usCrcData usCrcData 0xa001 else usCrcData usCrcData 1 printf CRC 16 DATA xH n usCrcData usErrChkData usCrcData 8 usCrcData 8 printf CRC 16 ENDIAN DATA xH usErrChkData iDummy getch ...

Page 20: ...6Data Xor Val H Mid sCharData 2 intLoopCnt1 1 2 For intLoopCnt2 0 To 7 For intLoopCnt3 0 To 15 If intCrc16Data And 2 intLoopCnt3 0 Then int2ByteImage intLoopCnt3 0 Else int2ByteImage intLoopCnt3 1 End If Next intLoopCnt3 intCarryFlg int2ByteImage 0 For intLoopCnt3 1 To 15 int2ByteImage intLoopCnt3 1 int2ByteImage intLoopCnt3 Next intLoopCnt3 int2ByteImage 15 0 intCrc16Data 0 For intLoopCnt3 0 To 1...

Page 21: ...id strWorkBuf 3 2 Mid strWorkBuf 1 2 example 1241H 41H 12H Return strCRC End Function Microsoft Visual Basic NET is either trademarks or registered trademarks of Microsoft Corporation in the U S and other countries ...

Page 22: ...CII characters Example For the data 02H 07H LRC is F7H which will be 02H 07H F7H as a binary message so that the ASCII message will be 30H 32H 30H 37H 46H 37H Example1 C programming LRC PROGRAM include stdio h include conio h void main void unsigned short usData unsigned short usLrcData int iDummy usLrcData 0 printf Hex DATA q END n while scanf x usData 0 usLrcData usData usLrcData usLrcData 0xff ...

Page 23: ...r Dim sRtnLrc As String intStrSize Len sCharData 2 intLRC 0 For intLoop 1 To intStrSize intLRC intLRC Val H Mid sCharData 2 intLoop 1 2 Next intLoop sRtnLrc Hex HFF intLRC 1 sRtnLrc Microsoft VisualBasic Right 0 sRtnLrc 2 Return sRtnLrc End Function Microsoft Visual Basic NET is either trademarks or registered trademarks of Microsoft Corporation in the U S and other countries ...

Page 24: ...Reference Nos specified If data is written on any non specified Reference No it is likely to affect the proper operation of the instruments 4 While it is possible to write data on two or more discreet Reference Nos a start number with Reference No not specified will result in an error error No 02H 5 When reading two or more Reference Nos the data with non specified Reference No becomes 0 6 When an...

Page 25: ... 30001 100 that can be expressed by 2 bytes 00H 64H See Table 3 of Section 6 3 The number of data pieces to be read is 2 of the Measured data PV and the PV status which can be expressed by 00H 02H in 2 bytes 4 Error check 2730H calculated with CRC 16 30H 27H Error check in RTU mode is calculated with CRC 16 See Section 6 3 5 1 The data in the core message is 02H 04H 00H 64H 00H 02H according to 1 ...

Page 26: ... of Reference No H 00H CRC L 51H Number of Reference No L 01H CRC H CCH CRC L BCH CRC H 26H LRC 98H LRC FCH Note Start No Relative No is given by Reference No 1 Decimal number 100 101 1 Hexadecimal 64H Note No of data is the number of data bytes which is different from the requested number of Reference No In the example given above the requested number of Reference No is1 and the number of data is...

Page 27: ...ata L 78H CRC H 07H D data H 00H D data L 14H CRC L 1DH CRC H 91H LRC 2BH LRC 4DH Note Start No Relative No is given by Reference No 40001 Decimal number 205 40206 40001 Hexadecimal CDH Note No of data is the number of data bytes which is different from the requested number of data In the example given above the requested number of reference No is 3 and the number of data is 6 Note The number of d...

Page 28: ...mmed to 0 all the slave units execute this command although no response is received from any of them 6 5 6 Write analog parameter write into a single hold register Function code 06 06H An analog parameter with specified numbers is brought into a specified value Example Programming the variation limiter of the slave unit 2 to 50 0 Program Reference No 40211 of analog parameter to 500 for the slave ...

Page 29: ...The LSB of each data unit D0 is the digital data of the smallest numbered data When the number of specified numbers is not a multiple of 8 the unnecessary bits are ignored Example Executing the AT on the slave unit 2 Program the data of the digital parameters with reference numbers 101 of the slave unit 2 as shown below Reference No 101 Data ON AT start RTU mode Master Instruments Instruments Mast...

Page 30: ...t data L 78H 2nd data H 00H 2nd data L 5AH 3rd data H 00H 3rd data L 19H CRC L 36H CRC H 56H LRC 2DH LRC 1EH Note Start No Relative value is given by Reference No 40001 Decimal number 205 40206 40001 Hexadecimal CDH Note When the slave address is programmed to 0 all the slave units execute this command although no response is received from any of them Note The number of message data transmittable ...

Page 31: ... 01 81H Error code 02 82H CRC L 03 83H CRC H 04 84H 05 85H 06 86H 08 88H 15 8FH 16 90H Error codes are as follows Error code Description 01H Function code failure When receiving an unspecified function code 02H Relative No Reference No failure When the start No or parameter No received is not the specified number 03H Data pieces failure The number of data pieces to be transmitted in response to th...

Page 32: ... Temperature input Set by the each range Linear input Set linear decimal point 40119 03 06 16 R W W PV start ON OFF OFF ON 0 1 OFF 0 Choose On to start or OFF not to start inclining by PV 0 OFF 1 ON 3 No 1 No 2 Parameter FNC code Applicable function code R W R READ W WRITE Reference No FNC code R W DATA Setting range communication range Default Details 40201 03 06 16 R W W SV 1999 to 9999 SV limit...

Page 33: ... 120 Sec 0 infinity 40208 03 06 16 R W W D 0 to 9999 20 Sec 0 off 40209 40210 03 06 16 R W W Output limiter L Output limiter H 5 0 to 100 0 50 to 1000 0 0 to 105 0 0 to 1050 0 0 100 0 It should be set L H 40211 03 06 16 R W W Variation limiter 0 1 to 100 0 1 to 1000 100 0 4 Instrument Operatopn FNC code Applicable function code R W R READ W WRITE Reference No FNC code R W DATA Setting range commun...

Page 34: ...t Set by the each range Linear input Set linear decimal point When PV is over range 32767 When PV is under range 32768 30102 04 R PV status 0 normal 1 Over range 2 Under range 4 Input circuit hard is error 30103 04 R Setting value SV Current adopted SV fixed SV inclining SV and remote SV etc Decimal place Temperature input Set by the each range Linear input Set linear decimal point 30104 04 R SV s...

Page 35: ...lf 0 AT stop or End 1 AT start or AT Execution During Ready cannot be execute During 2 position control cannot be execute 6 7 4 Digital input data only reading FNC code Applicable function code R W R READ W WRITE Reference No FNC code R W DATA Details 10004 02 R RJ error 0 normal 1 RJ error occurrence 10117 Event1status 0 event OFF 1 event ON 0 during stand by event OFF 10118 Event1status 0 0 1 10...

Page 36: ... digital communication can be done between LT and LT Details See 7 Communications Transmission and Communications Remote In this case LT8 that is set at communications remote will receive all types of remitted data PV SV as remote SV 6 9 2 Personal Computer Communication Communications Remote Functions There will be the case that it needs to receive the remote SV in a connecting condition of perso...

Page 37: ...ammed as a master unit Communications Transmission When the communications function of the Mode 6 is programmed to rEM in case a master LT8 controller is programmed to trS or CoM in case a master LT8 controller is programmed to trS 2 LT8 controller is programmed as a slave unit Communications Remote Communications Functions Programs and Details of Transmission Data Mode 6 Communications Functions ...

Page 38: ...combining a master LT8 controller Communications Transmission and slave LT8 controllers Communications Remote digital remote control and zone control will be available 1 Following parameters should be programmed for slave LT8 controllers Communications Remote 1 Program the protocol PtCL Refer to section 7 5 1 2 Program the communications function FunC Refer to section 7 5 2 3 Program the transmiss...

Page 39: ...I If a protocol is changed communication function and character will become an initial value 7 5 2 Programming Communications Functions FunC 1 Press then you will see 2 Choose the trs 2 by pressing and then press to register Programmed for communications with a personal computer Default CoM Programmed for communication transmission with MODBUS on a master unit 7 5 3 Programming Transmission Speed ...

Page 40: ...ings PV Transmits a measured value Default SV Transmits a setpoint value 1 Press then you will see 2 Choose the Transmission Type by pressing and then press to register 7 5 7 Programming Remote Shift r biA The shift width of the SV data received by Communications Remote can be adjusted Arbitrary shift width can be programmed for each slave unit programmed to the Communications Remote Program it as...

Page 41: ...o Section 7 5 5 for remote change to slave unit Communications Transmission LT8 Master unit Communications Remote LT8 Slave unit Communications Remote LT8 Slave unit Communications Remote LT8 Slave unit Termination resistor 100Ω ８６ SA SG ８６ SA SB SG ８６ SA SB SG ８６ SA SB SG ７７７７ SB ...

Page 42: ...ogrammed at multiple zones 7 7 2 Zone Control In A Soaking Pit A master LT8 controller located in the middle sends PV by the communications transmission and slave LT8 controllers located at both sides receive the PV as SV by the communications remote This results in a control with superior characteristics in soaking LT8 Slave SV remote LT8 Master LT8 Slave SV remote Zone 1 Zone 2 Zone 3 F C E F C ...

Page 43: ...32 8 KUMANO CHO ITABASHI KU TOKYO 173 8632 Telephone 81 3 3956 2171 Facsimile 81 3 3956 0915 Printed in Japan ...

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