Panel Mount Mass Flow Controller MPC Series User`s Manual
Contents
1. 6 6 cece e cece cece eee eee ees 5 9 Chapter 6 COMMUNICATION PROGRAM FOR MASTER STATION 6 1 Precautions for Programming 0 cece eee eee e eet eee 6 1 6 2 Example of Communication Program eeee eee eee eee ees 6 2 M Prior to running the sample program 0s eee e eee eee ees 6 2 E Running the sample program sees cece eee eee eee ees 6 2 E Data read write sample program 00sec eee eee eee eens 6 3 Chapter 7 TROUBLESHOOTING M Check items in case communication is disabled 7 1 Chapter 8 SPECIFICATIONS E RS 485 specifications 6 6 c cece ence eee eee eee ees 8 1 APPENDIX M Code table 0 cc cece cece cece cece eee eee ences Appendix 1 M Connection with CMC10L 0 ccc cece eee eee Appendix 2 vi Conventions Used in This Manual The following conventions are used in this manual CJ Handling Precautions Note gt gt OK lamp ENT key Handling precautions indicate items that the user should pay attention to when handling the MPC series Notes indicate useful information that the user might benefit by knowing This indicates the item or page that the user is requested to refer to The numbers with the parenthesis indicate steps in a sequence or indicate corresponding parts in an explanation This indicates the contents shown on the personal computer o2. Appendix 3 Revision History Date 04 04 CP SP 1154E st Edition ZAMATAKE Specifications are subject to change without notice Yamatake Corporation Advanced Automation Company Totate International Building 2 12 19 Shibuya Shibuya ku Tokyo 150 8316 Japan URL http www yamatake com This has been printed on recycled paper 02 Printed in J apan 1st Edition Issued in Apr 2004 E
3. cc ccc cece cee cece eee eee e eee eeeeenee 4 12 M Normal and warning termination 6 ese eee eee eee eee 4 12 E Error termination 0 c cee cece cece eee eee eee ne eens 4 12 Timing Specifications 6 eee cece n ene ees 4 13 E Timing specifications for instruction and response messages 4 13 M RS 485 driver control timing specifications 4 13 M Other precautions 6 eee eee cent eee teens 4 14 Chapter 5 COMMUNICATION DATA TABLE 5 1 Basic Communication Data Processing esse cere eee eee 5 1 E Communication data types and formats ooooocccccccccc 5 1 M Communication data storage memory 6c cece eee eee es 5 1 E Data address es a aces ae 5 2 E Number of data read write oooooooccccocncono 5 2 M Data unit and decimal point position ooooooocccccccccoc 5 2 5 2 Communication Data Table 0 cece ec cee cence eee e ene eens 5 3 E Device related data 2 ccc ccc cece cece eee r EEE RESE E 5 3 M Operating status related data 6 ccc cece cece eee eee eens 5 4 E Instantaneous flow related data ooo oooooooooooo o 5 5 M Integrated flow related data 6 cece cece eee e cee eens 5 5 M Function setup related data ee eee ee eee eee eee teen eee 5 6 E Parameter setup related data
4. Failure to do so might cause malfunction oe 606 Make sure that wire scraps chips or water do not enter inside the case of the MPC Failure to do so might cause faulty operation or malfunction The Role of This Manual Three manuals are available for the MPC series Read the manual according to your specific requirements The below lists all the manuals that accompany the MPC series and gives a brief outline of the manual If you do not have the required manual contact Yamatake Corporation or your dealer Panel Mount Mass Flow Controller MPC Series Manual No CP UM 5317E This manual is supplied with the product Personnel in charge of design and or manufacture of a system using this unit must thoroughly read this manual This manual describes the safety precautions installation wiring and primary specifications For further information about operation refer to other manuals Installation amp Configurations Panel Mount Mass Flow Controller MPC Series Installation amp Configurations Manual No CP SP 1153E This manual describes the hardware and all functions of this unit Personnel in charge of design manufacture operation and or maintenance of a system using this unit must thoroughly read this manual This manual also describes the installation wiring all functions and settings of this unit operating procedures troubleshooting and detailed specifications Panel Mount Ma
5. OutOfWhile if SizeToRead gt ReadSize amp amp SizeToRead xFFFFFFFF I IC ReadSize 0 ErrFlag 0x00010000 return false return true void CPLSum unsigned char str int len unsigned char buf gt int num unsigned char ch for ch amp str ch lt amp str len ch num ch num Cnums 0x000000FF 80x000000FF sprintf char buf 02X num gt bool AppCPL char tosend char received unsigned char theMsg BUFFERSIZE unsigned char theApp BUFFERSIZE unsigned char theHdr 16 unsigned long SzToSnd unsigned long RdSz unsigned long ErrFlg bool rt int Cnt 0 unsigned char Sum 4 char etx ifC handle void xFFFFFFFF return false ZeroMemory theMsg BUFFERSIZE sprintf Cchar theHdr x 2 x30 x31 x30 x30 x58 sprintf Cchar theMsg s sYx03 theHdr tosend ifC CheckSum SzToSnd strlen char theMsg CPLSum theMsg SzToSnd amp theMsg SzToSnd strcat char theMsg YrYn SzToSnd strlen char theMsg resend Write theMsg SzToSnd rt Read theMsg xFFFFFFFF amp RdSz amp ErrFlg if Irt H ifCCnt lt COMRESENDNUM goto resend ifC ErrFlg XX ErrorCode ErrFlg telsef ErrorCode 0x000f0000 return false Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION Jelse ifC strncmpC Cchar theMsg Cchar theHdr 6 Y ErrorCode 0x00020000 ifC Cnt lt COMRESENDNU
6. The number of data item which can be written in one message is limited See W Number of data read write page 5 2 for details Chapter 4 COMMUNICATION PROCEDURE E Write response Role When the message in the data link layer is correct only the termination code is sent back lt gt Description The termination codes are classified as follows Ferran eos H orma The termination code is a 2 digit decimal Error O Normal response Role Returns how the write instruction message has been processed Only a normal termination code or warning termination code is returned A Termination code 00 normal oa on en 0 05 ao 0 oon on sr o Lo o x oe ojeras aporte Ss Data link layer Application layer Data link layer O Example Normal response when all data items are correctly written O Alarm response GC Termination code 45 warning ENEE TE ism ol o o x jerx 9 2 of es Data link layer Application layer Data link layer MM A warning response gt indicates the warning code numeric O Error response Role Only the abnormal termination code is returned O Example An abnormal response indicates an abnormal response Termination code 33 error on so ssn sen oan ee 77 of om sx o Lo fo x er gt gt og uF BZ Data link layer Application layer Data link layer 4 11 Chapter 4 COMMUNICATION PROCEDURE 4 6 Termina
7. Driver control End of master station End of slave station transmission transmission 1 2 3 4 End of master station transmission Driver disable time 500us max End of slave station reception Driver enable time 15ms min End of slave station transmission Driver disable time 10ms max End of master station reception Driver enable time 10ms min nn Chapter 4 COMMUNICATION PROCEDURE E Other precautions 4 14 The time required for the master station to finish the transmittal of instruction message and for the slave station to start the transmittal of response message becomes longer if the number of data to write and read increases When the faster response time is required by the slave station make sure to keep the number of data to read write at the minimum in one message e When the number of data is one data to read write in one message the time required for the master station to finish the instruction message and for the slave station to transmit the response message is about 30ms Chapter 5 COMMUNICATION DATA TABLE 5 1 Basic Communication Data Processing E Communication data types and formats O Types of communication data The communications data are categorized as follow Device related data Operating status related data Instantaneous flowrate related data Integrated flow related data Function setup related data Parameter setup related data O Format of communication data Commun
8. layer O Example Application layer os se 00H om er ee one Data link layer The above example shows that 2 and 65 are written at address 1001W and 1002W in one message e Individual data items are delimited with a comma character code 2CH e The number of write data does not need to specify e A capital letter code is used for each numeric or character in the application layer e A decimal number is used for each numeric e Additional 0 s 30H or spaces cannot be added to each data item O Example O Write command WS 4 Role lt gt Description O Start data address Role O Write data Role lt gt Description The underlined portion of WS 01001W 1 is not allowed The underlined portions of WS _1001W 01 are not allowed A write command Two WS 57H 53H characters Specifies the start data address See 5 2 Communication Data Table page 5 3 for information on the relationship between data addresses and write data Be sure to append the numeric representing the data address with W 57H Data to be written to continuous addresses starting with the specified data address The range of a numeric to be written differs according to each data address Individual data are delimited by a comma 2CH The data address at which the corresponding data is written is incremented by sequentially starting with the start data address see the example above
9. master station Be sure to connect SG terminals each other Failure to do so might cause unstable communications 2 2 Capter 3 SETTING Before starting communication set the communication condition and station address of the slave station to meet that of the master station E Setting method Operate the following procedure to set the communication functions 1 Put the integrated display mode by pressing the DISP key gt gt The L lamp lights 2 Keep pressing the lt key for about 3s gt gt The Hr iF displays on the upper display and the mode transit the parame ter settings mode 3 Keep pressing the lt key for about 3s again gt gt The item No t dd I appears on the upper display and the mode transit the function setting mode 4 Select a target setting item by pressing either A key or v key 5 Press the ENT key gt gt The current setting value blinks on the lower display 6 Select a target setting by pressing either A key or v key 7 Press the ENT key at the target setting gt gt The setting value stores in memory and renews 8 When wanting to set another setting items return to 4 operation and wanting no more go to 9 operation 9 Press the DISP key gt gt The mode returns to the normal display of instantaneous PV indication 0 Handling Precautions e If any key is not pressed for 1min after the function settings mode the mode returns to the normal displ
10. the data in RAM becomes the same as in EEPROM EEPROM Data are written in both RAM and EEPROM 5 1 Chapter 5 COMMUNICATION DATA TABLE E Data address The data addresses are allocated as shown in the table below EEPROM mm een Device related data 1000 1001 to 1199 4000 4001 to 4199 Operating status 1200 1201 to 1399 4200 4201 to 4399 related data Instantaneous flow 1400 1401 to 1599 4400 4401 to 4599 rate related data Communication data Integrated flowrate 1600 1601 to 1799 4600 4601 to 4799 related data Function setup 2000 2001 to 2199 5000 5001 to 5199 related data Parameter setup 2200 2201 to 2399 5200 5201 to 5399 related data E Number of data read write The number of data which can be continuously read written by once communication is as shown in the tabble below Read 1 to 10 words 1 to 10 words 1 to 10 words 1 to 10 words E Data unit and decimal point position 5 2 Read write data is not appended with a decimal point The unit and decimal point position is determined for each data item For details on the data unit and decimal point position see the MPC series User s Manual Chapter 5 COMMUNICATION DATA TABLE 5 2 Communication Data Table The enabling conditions for the address and R W Read Write of each data are specified in the following table E Device related data Display Gas type Decimal point display position of instantaneous flowrate Decimal
11. used in the following example 1 Add one byte each to the character codes from STX to ETX The lower order one byte of the calculation result is 76H 2 The result of two s complement addition is 8AH 3 Converted into character codes and use as the checksum value The result is 8A 38H and 41H See the station address example on the page 4 3 for information on character code conversion Do not omit the checksum in the instruction message Chapter 4 COMMUNICATION PROCEDURE O CR and LF Carriage Return Line Feed Role Indicates the end of a message lt gt Description CR is ODH and LF is OAH Be sure to use CR and LF in pair a Handling Precautions e If any of the following errors occur in the data link layer the MPC series does not respond The communication conditions for both stations do not match different transmission speeds or the occurrence of a parity error STX ETX CR and LF are not placed at the right positions The device ID code is neither X nor x The station address subaddress or checksum is not two character codes The calculation of the checksum does not agree with that of the message Non specified characters are included in the message The destination station address differs from the station address for the receiving station The station address set to 00 e The contents of the data link layer of the response message are same as the instruction me
12. 02 and 4602 PV forced zero function 0 0 to 999 9s 2220 5220 delay time 1 Though a normal termination code is returned after sending the write instruction message the data cannot be written gt LL gt LL 5 9 Chapter 6 COMMUNICATION PROGRAM FOR MASTER STATION 6 1 Precautions for Programming Pay attention to the following points when making communications programs The longest response time on the device is 2s For this reason set the response monitor time to 2s Resend the same message if there is no response within 2s Set a communications error to occur if there is no response even after 2 retries Be sure to make the above resends to guard against the case when the message cannot be send correctly due to the influence of noise for example during communications Note When the master station resends the message alternatively use the device ID codes X and x This is convenient as you can tell whether or not the received message is the previously received message 6 1 Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION 6 2 Examples of Communication Program The program is written in Borland s C Builder5 0 or Borland C Compiler5 5 for Windows95 98 NT 2000 This program is given here as a reference when the user makes a program and does not assure all the operations You can download Borland C Compiler5 5 from Borland Home Page E Prior to running the sample program Make
13. 0L communication controller is an RS 232C RS 485 3 wires system converter available from Yamatake Chapter 2 WIRING A CAUTION Be sure to turn off the power supply when you connect the MPC Failure to do so might cause malfunction Do not disassemble the MPC Doing so might cause malfunction Wire the MPC in compliance with the predetermined standards Also wire the MPC with specified power cables according to recognized installation methods Failure to do so might cause malfunction Use the MPC within the operating ranges temperature humidity voltage vibration shock mounting direction atmosphere etc recommended in the specifiations Failure to do so might cause malfunction o Handling Precautions For wiring except for RS 485 communication line refer to gt MPC series User s Manual CP UM 5317E and MPC series User s Manual Installation amp Configurations CP SP 1153E Chapter 2 WIRING An example of connection methods is shown below MPC series Slave station Terminating resistor MPC series Slave station Terminating resistor 0 Handling Precautions e Connect terminating resistors of 1500 5 1 2W or more to the both ends of the communication path Ground the shield to the FG at one end of the shiled Make sure that the shield is not grounded at both ends of the shield On 3 wire system Yamatake s CMC10L001 A000 controller can be used as a converter of the
14. 1206 Xx 4206 x The value with excluded SP value in use L min standard decimal point of flow L min 7 za multiplied by the Instantaneous 0 to 100 FS 1207 x 4207 X percent in the full scale flow PV value L min standard bracket Valve drive 0 0 to 100 0 1208 O X 4208 x X The value with excluded current output decimal point 1 Alarm status bit configuration Address 1201 0 Nomal 1 Error e Flowrate deviation lower limit alarm Flowrate deviation upper limit alarm 4 Undefined normally 0 Undefined normally 0 Input output adjustment data error 6 Sensor calibration data error User setup data error 8 Valve overheat prevention limit is operated 2 Event status bit configuration Address 1202 0 OFF 1 ON o Event output 1 status Event output 2 status Undefined normally 0 6 emma normaly 5 4 Chapter 5 COMMUNICATION DATA TABLE 3 Control status bit configuration Address 1203 0 OFF 1 ON OK lamp Instantaneous PV control status O Light out 1 Lighting Instantaneous PV OK Slow start operation 0 Normal operation 1 Slow start operation Digital setting Analog setting 0 Digital setting 1 Analog setting Integrated count status 0 Integrated PV lt Integrated SP 1 Integrated PV Integrated SP Undefined normally 0 HEN Undefined normally 0 EE Undefined normally 0 Undefined normally 0 E Instantaneous flowrate related data Display Data ra
15. M goto resend return false if CheckSum CPLSumC theMsg RdSz 4 Sum ifC CtheMsg RdSz 4 Sum I I CtheMsg RdSz 3 Sum 1 ErrorCode 0x00040000 ifC Cnt lt COMRESENDNUM goto resend return false ZeroMemory theApp BUFFERSIZE CopyMemory theApp amp theMsg 6 RdSz 6 etx strstr char theApp x 3 gt if etx NULL ErrorCode 0x00200000 ifC Cnt lt COMRESENDNUM goto resend return false telsef etx 0x00 strcpy received char amp theApp gt return true Chapter 7 TROUBLESHOOTING M Check items in case communication is disabled 1 Check the power supply 2 Check the wiring 3 Check if the communication conditions for the MPC series meet those for the host computer If any one of the following setting items is different between both stations communication is disabled The underlined items mean that they can be set on the MPC series side Transmission speed 2400 4800 9600 19200 38400bps Data length 7 8 bits Parity No parity odd parity even parity Stop bit I stop bit 2 stop bits 4 Check if the destination address of the command frame transmitted from the host computer meets the address set to the MPC series The address of the MPC series set to 0 for factory setting Even when the destination address of the command frame is set to 00 30H 30H the MPC series does not respond to such a message 5 Are those
16. YAMATAKE No CP SP 1154E Panel Mount Mass Flow Controller MPC Series User s Manual Communication Functions Thank you for purchasing the Panel Mount Mass Flow Controller MPC series This manual contains information for ensur ing correct use of the communication func tions of the MPC series Those who design and maintain devices that use the communi cation functions of the MPC series should read this manual It also provides necessary information for installation maintenance and troubleshooting Be sure to keep this manual nearby for handy reference Yamatake Corporation RESTRICTIONS ON USE This product has been designed developed and manufactured for general purpose application in machinery and equipment Accordingly when used in applications outlined below special care should be taken to implement a fail safe and or redundant design concept as well as a periodic maintenance program e Safety devices for plant worker protection e Start stop control devices for transportation and material handling machines Aeronautical aerospace machines e Control devices for nuclear reactors Never use this product in applications where human safety may be put at risk IMPORTANT If it is necessary to change the parameters of the MPC series frequently by communication write data at addresses of RAM The endurance of EEPROM is limited to 10 000 erase write cycles Note that the data in RAM is cleared a
17. ange selection Instantaneous flowrate analog output voltage range selection PV analog output voltage range selection Event 1 output type assignment Event 2 output type assignment Key lock disabled Settings other than instantaneous SP and integrated SP are key locked All settings key locked Disabled selection by key operation Enabled selection by key operation Digital setup set by key operation or communcations Analog setup set by external analog input voltage Number of SPs 1 SP 0 only Number of SPs 2 SP 0 SP 1 Number of SPs 3 SP 0 to SP 2 Number of SPs 4 SP 0 to SP 3 O to 5V input 1 to SV input O to 5V output 1 to 5V output Not used normally OFF ON at alarm occurred Integrated pulse output ON at instantaneous PV OK ON during control mode ON during fully open mode ON during control or fully open mode ON during fully closed mode Instantaneous high limit event Instantaneous low limit event 1 Remarks 10 Instantaneous low limit event 2 11 Integrated flowrate event 1 to 11 Reversed output 1 to 11 above ON at normal times OFF at event occurrence 5 6 Display Setting range Chapter 5 COMMUNICATION DATA TABLE EEPROM Address R w Remarks moa poi eo e p CE External contact 1 input function assignment External contact 2 input function assignment Undefine
18. audRate CBR_19200 DCB fBinary 1 DCB fParity 1 DCB ByteSize 0x08 DCB Parity EVENPARITY DCB StopBits ONESTOPBIT ifC SetCommState handle 8DCB CloseHandle handle handle void xffffffff return 8 return 0 int Close void gt ifC handle void oxffffffff J ifC SetCommMask handle H CloseHandle handle handle void xffffffff return 2 ifC EscapeCommFunction handle CLRDTR CloseHandle handle handle void oxffffffff return 3 ifC CloseHandle handle return 4 handle void xffffffff Jelse return 1 return 0 bool Write unsigned char Mesg unsigned long Size gt unsigned long Error unsigned long Errors unsigned long SizeWritten COMSTAT Stat ifC handle void OxfffFFFFF return false I if Size gt BUFFERSIZE printf trans mission data is too long return false Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION dot ClearCommError handle amp Errors amp Stat whileC BUFFERSIZE lt Stat cbOutQue Size if WriteFileC handle Mesg Size amp SizeWritten false ifC GetLastError ERROR_IO_PENDING while GetOverlappedResult handle 0 amp SizeWritten true Error GetLastError ifC Error ERROR_IO_INCOMPLETE continue telsef ClearCommError handle amp Errors amp Stat break telset ClearCommError handle amp Errors amp Stat ifC Size SizeW
19. ay of instantaneous PV indication e When pressing the DISP key without pressing the ENT key after 6 operation the setting is not renewed but remained as the previous value e When setting a station address zero the communication function does not work E Setting items of communication Station address 0 Communications function The communications function does disabled not work at 0 Set a different addre 1 to 127 Communications address ss among the slave stations Transmisson speed 0 38400bps selection 19200bps 96 00bps 4800bps 2400bps Communications 8 bits data even parity 1 stop bit condition 8 bits data no parity 2 stop bits Capter 4 COMMUNICATION PROCEDURE 4 1 Outline of Communication Procedure and Messages This chapter describes the outline of communication procedure and the concept behind message configuration E Communication procedure The following is a simple breakdown of the communication procedure 1 The master station transmits an instruction message to a slave station to specify a station for communication 2 The slave station processes the instruction message and executes read and write operations 3 The slave station transmits a response message according to the contents of processing 4 The master station receives the response message and executes processing E Message configuration message consists of two layers as shown below Both the instructio
20. cal damage to this product E Examples wrongful operation or misuse of this product These icons graphically represent the actual danger The example on the left warns the user of the danger of electric shock Triangles warn the user of a possible danger that may be caused by prohibited to prevent possible danger These icons graphically represent the actual prohibited action The example on the left notifies the user that disassembly is prohibited Q White circles with a diagonal bar notify the user that specific actions are Black filled in circles instruct the user to carry out a specific obligatory action to prevent possible danger These icons graphically represent the actual action to be carried out The example on the left instructs the user to remove the plug from the outlet E NWARNING Do not use the MPC for medical instruments CAUTION Be sure to turn off the power supply when you connect the MPC Failure to do so might cause malfunction Do not disassemble the MPC Doing so might cause malfunction Wire the MPC in compliance with the predetermined standards Also wire the MPC with specified power cables according to recognized installation methods Failure to do so might cause malfunction Use the MPC within the operating ranges temperature humidity voltage vibration shock mounting direction atmosphere etc recommended in the specifiations
21. d Automatic valve shut off function at integrated flowrate event occurrence Switching of integrated reset func tion at start of control Flowrate alarm setup type Operation selection at alarm occurrence Slow start setup Gas type selection Reset integration Stop integration count Switching of Switching of Operating mode forced Operating mode forced Switching of slow start Switching of operation Function disabled Function enabled Function disabled Function enabled Function disabled Only upper limit alarm Only lower limit alarm Upper lower limit alarm Control continued 1 Forced fully closed 2 0 Slow start disabled Not used operation instantaneous SP No instantaneous flowrate setup method Il VIT fully closed fully open operation mode Control at contact ON forced fully closed at contact OFF use used used alarm ignored Forced fully open 1 to 8 Slow start enabled equivalent to about 1 to 6 seconds settling time Conversion factor for each gas type set by the user Air nitrogen Argon Carbon dioxide CO2 5 7 Chapter 5 COMMUNICATION DATA TABLE 5 8 Display Setting range EEEROM Remarks pas w paes n w Flowrate display Referenced to 20 C 1 2019 5019 unit selection atmosphere Referenced to 0 C 1 atmosphere Referenced to 25 C 1 atmosphere Referenced to 35 C 1 at
22. d obtained by Instantaneous flowrate 0 5 to 100 FS 2203 5203 multiplying the deviation high limit alarm L min standard full scale flowrate Instantaneous flowrate 0 5 to 100 FS 2204 5204 by the i deviation high limit alarm L min standard percentage in hysteresis parentheses Th tti deviation lower limit alarm Limin on according to the Instantaneous flowrate 0 5 to 100 FS 2206 5206 model deviation lower limit alarm L min standard hysteresis Instantaneous flowrate 1 0 to 999 9s 2207 5207 deviation alarm judgment delay time Event 1 output delay time 0 0 to 999 9s 2208 5208 Even if the delay time is set it is disabled during Event 2 output delay time 0 0to999 9s 2209 5209 eloction or integration pulse output User setup conversion 0 100 to 9 999 2210 5210 Under the gas factor C F type selection Address 5018 of the function setup the setup value is only effective when the User setup is selected o Undefined 2212 5212 O e a 1 output 0 to RES dEl EZAR high low limit flowrate setup L min standard Event 2 output 0 to 100 FS 2214 5214 high low limit flowrate setup L min standard fundeted o mee OL Tf esp OT 1 Undefined o oO seo m Analog option scaling 10 to 100 FS 2217 1 5217 4 function pr standard Integrated SP setup 0 to 9999 2218 5218 Same as address lower 4 digits 1601 and 4601 Integrated SP setup 0 to 9999 2219 5219 Same as address upper 4 digits 16
23. fofrfw feler ef aforju Data link layer O Read command RS O Start data address O Number of read data O Example Application layer Data link layer The above example shows that two data items are read from 1001W as one message Individual data items are delimited by a comma character code 2CH e An capital letter code is used for each numeric or character in the application layer e A decimal number is used for each numeric Additional 0 s or spaces cannot be added to each data item O Example Role lt gt Description Role lt gt Description Role lt gt Description The underlined portion of RS 01001W 2 is not allowed The underlined portions of RS _1001W 02 are not allowed A read command Two RS 52H 53H characters Specifies the start data address See Chapter 5 COMMUNICATION DATA TABLE for information on the relationship between data addresses and read data Be sure to append the numeric representing the data address with W 57H Specifies how many data items are read continuously starting with the specified data address There is a limit for the number of data to read in one message For details refer to M Number of data read write page 5 2 4 7 Chapter 4 COMMUNICATION PROCEDURE E Read response When the message in the data link layer is correct a response message is sent back according to the contents of the i
24. gc char argv char command 255 char recieve 255 handle void JOxffFFFFFF ErrorCode Q CheckSum true if Open strcpyCcommand RS 1000W 2 AppCPLCcommand recieve printf command s n command printfC result s n recieve strcpyCcommand WS 1000W 2 AppCPLCcommand recieve printfC command s n command printfC result s n recieve Close getchar return Il 7272 22 72 27421421414 int Open void COMMTIMEOUTS Timeouts _DCB DCB handle CreateFile COM1 GENERIC_READ GENERIC_WRITE 0 0 OPEN_EXISTING FILE_ATTRIBUTE_NORMAL ifC handle void oxffffffff return 3 ifC SetupComm handle BUFFERSIZE BUFFERSIZE CloseHandle handle handle void exffffffff return 4 Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION ifC PurgeComm handle PURGE_TXABORT PURGE_RXABORT PURGE_TXCLEARIPURGE_RXCLEAR CloseHandle handle handle void xffffffff return 5 Timeouts ReadIntervalTimeout Timeouts ReadTotalTimeoutMultiplier Timeouts ReadTotalTimeoutConstant Timeouts WriteTotalTimeoutMultiplier Timeouts WriteTotalTimeoutConstant OxFFFFFFFF OOOS ifC SetCommTimeouts handle amp Timeouts CloseHandleC handle handle void oxffffffff return 6 ifC GetCommState handle amp DCB J CloseHandle handle handle void oxffffffff return 7 DCB B
25. i slave station 206 PR 6 6 SG D D pe DD Shielded _ cable li Host computer CMC10L T MPC series slave station Terminating A eee CE gt nz Q o Handling Precautions Appendix 2 Connect terminating resistors of 1500 5 1 2W or more to the both ends of the communication path Ground the shield to the FG at one end of the shield Make sure that the shield is not grounded ato both ends of the shield Be sure to connect SG terminals each other Failure to do so might cause unstable communications Appendix Connect the master station SD to the slave station RD and the master station RD to the slave station SD To execute this connection set the MODE switch provided in the CMC10L as shown in the following table in accordance with the host computer side RS 232C connector pin arrangement modem terminal and the type of cable cross straight RS 232C Cable type MODE switch used TERMINAL TERMINAL MODEM MODEN Straight An RS 232C cable with a D SUB 9 pin connector at each end where pins with the same number are mutually connected for example pin 2 RS 232C cable to pin 2 and pin 3 to pin 3 Cross An RS 232C cable with a D SUB 9 pin connector at each end where different number pins are connected for example pin 2 to pin 3 and pin 3 to pin 2 D Sub 25 pin D Sub 9 pin conversion cable An RS 232C cable for conversion between D Sub 25 pin and D Sub 9 pin
26. ication data is classified into the following formats Numeric data Data indicating a numeric value PV SP etc O Bit data Data where each bit is significant alarms etc Bit data must be composed by transmission and decomposed by reception If it is necessary to change the parameters of the MPC series frequently by communication write data at addresses of RAM The endurance of EEPROM is limited to 10 000 erase write cycles Note that the data in RAM is cleared and is replaced with the data in EEPROM if the power supply to the MPC series is interrupted IMPORTANT E Communication data storage memory O Memory type The communication data are stored in the following two types of memory RAM Stored data is cleared when the power is turned OFF However data can be written to this memory infinitely EEPROM Stored data is retained even when the power is turned OFF whereas data erase write cycles are limited to a total of 10 000 times owing to device characteristics O Communication object memory In communication it is necessary to read write data from into the abovementioned two types of memory according to the purpose and use There is a difference between the object memories as follows RAM Data is read written from into RAM only If the power supply 1s turned off after writing data into RAM and then it is turned on again the data in EEPROM is copied on RAM so
27. ix provides code tables Contents SAFETY PRECAUTIONS The Role of This Manual Organization of This User s Manual Conventions Used in This Manual Chapter 1 Chapter 2 Chapter 3 Chapter 4 4 1 4 2 4 3 4 4 4 5 4 6 INTRODUCTION WIRING SETTING E Setting method 0 eee cece eee eee ene ene 3 1 M Setting items of communication 6 6 e cece cece eee eens 3 1 COMMUNICATION PROCEDURE Outline of Communication Procedure and Messages 4 1 E Communication procedure 0s cece cece e een eee eee ees 4 1 E Message configuration cortar vr dra 4 1 M Examples ooocococccocccoccoccrcrr correr rr 4 2 M Data address concept ss ssseressrereesrrrrrsrrrerserererr 4 2 Data Link Layer 1 eee cece eee eect eee n ete n ene ees 4 3 M Description 2 cece eee een ete eee e eee n eens 4 3 Application Layer oocoococcococccccnccccnnrncn cr 4 6 E Outlier rias ac ee AAA 4 6 Data Read en ee 4 7 M Description of read instruction 0 cece eee eee eee eee 4 7 M Read response ee eee cece eect nett sesers 4 8 m Decimal numeric expression numeric data o lt o 4 9 Data Wihit iicicccs tect ee AAA A 4 10 M Description of write instruction oo0ocococorroroccro 4 10 M Write response ocooccccccocccccconccrnc creer 4 11 Termination Code Table
28. l characters For details see the example O Example When the station address of the destination is 10 1 10 decimal OAH hexadecimal 2 Converting into character codes 0 30H A 41H 3 OA 30H 41H is used as the station address Note See Chapter 3 SETTING for information on station address settings a Handling Precautions e Note that the function of the station address differs entirely from that of the data address of the application layer 4 3 Chapter 4 COMMUNICATION PROCEDURE 4 4 Subaddress lt gt Description O Device ID code lt gt Description O ETX End of TeXt Role lt gt Description O Checksum Role lt gt Description A Example o Handling Precautions The subaddress is meaningless on the MPC series Be sure to set a subaddress of 00 30H 30H that has the same format as the station address Only character codes X 58H or x 78H can be set on the MPC series Indicates the end of the application layer Fixed at 03H A value to be used to check whether or not a message has been corrupted by an error such as noise during communication Two hexadecimal characters This function operates as follows 1 Add one byte each to the character codes of the message from STX to ETX 2 Calculate the two s complement of the result of this addition 3 Convert the result into character codes The instruction message on the page 4 3 is
29. mosphere Inlet pressure setup 0 0 to 0 1MPa 2020 5020 0 05 to 0 15MPa 0 15 to 0 25MPa 0 25 to 0 35MPa 0 35 to 0 45MPa 0 45 to 0 5MPa Instantaneous flow 0 Function disabled 2021 5021 rate direct setting Function enabled functional change mema COS NE ES EI OT PV filter Average 0 No filtering 2023 5023 1 Moving average of 2 samples 2 Moving average of 4 samples 3 Moving average of 8 samples A EK EE EE ae NNN LA R Undefined 2027 O 5027 O CEC optional O l disabled EZAR E4El scaling function 1 Function enabled PV forced zero O Function disabled 2029 function 1 Function enabled Station address 0 Communication 2030 Be x setting functions disabled 1 to 127 Station address Transmission speed 0 38400bps 2031 5031 selection 19200bps 9600bps 4800bps 2400bps Communication 8 data bits even parity 1 conditions selection 1 stop bit 8 data bits no parity 2 stop bits 0 nRAN 0O 1 Though a normal termination code is returned after sending the write instruction message the data cannot be written Chapter 5 COMMUNICATION DATA TABLE E Parameter setup related data Display Setting range Pa PETROM Remarks mares R w asses R W Instantaneous flowrate 0 5 to 100 FS 2201 5201 The result O K judgment range L min standard becomes the Instantaneous flowrate 0 5 to 100 FS 2202 5202 NONE L min standard O K judgment hysteresis L min standar
30. multi dropped MPC series being operated themselves with different station address setups 6 Is the communication timing conformed with the 4 7 Timing Specifications Page 4 13 specifications 7 Use the capital letter character codes for all the character codes other than the device ID code X or x in this instrument 7 1 Chapter 8 SPECIFICATIONS E RS 485 specifications Transmission speed bps 2400 4800 9600 19200 38400 Transmission distance 500m max 300m when connected with the MA500DIM and CMC410 Communications flow Half duplex Synchronization Start stop synchronization Data format 8 data bits 1 stop bit even parity 8 data bits 2 stop bits no parity Error detection Parity check checksum Station address 0 to 127 Communication function is inhibited when set to 0 1 Network type N 31 units or less Other items Conforms to RS 485 interface specifications Appendix M Code table is not used for this communication system The codes The shaded part to be used change every instrument Appendix 1 Appendix E Connection with CMC10L The following diagram shows an example of wiring using a straight cable for a host computer in the terminal mode MPC series slave station Terminating AA o resistor er n o o oO a rn I 1 O Y 1 O Tp A I O og RD 2 O sp i V 3363 O 7 Shielded gt RS cabl MPC seri po aba
31. n message from a master station and the response message from a slave station take this form e Data link layer This layer contains the basic information required for communication It also contains message destination and check information e Application layer This layer is where data read and write operations are executed The content of this layer varies according to the purpose of the operation The figure below shows the individual layers A total of 31 units Slave stations FT message from master station Response ERTER from slave station Master station BR Application layer The driver of the data link layer knows The load data of the application layer Destination station address changes every time according to the Load check sheet checksum purpose of the operation 4 1 Chapter 4 COMMUNICATION PROCEDURE E Examples O Read instruction Instruction message Messages have the following structure leler sl a cr ur Data link layer Response message Application layer Data link layer srefofifofofxfofof Po 4 e fend s 4 or 1 Data link layer Write instruction Instruction message Application layer Data link layer OCA Data link layer e Response message Application layer Data link layer sr o 1 Lo o x o olend sl 2 erl r Sa Data link layer Application layer Data link layer The following sections describe in de
32. nd is replaced with the data in EEPROM if the power supply to the MPC series is interrupted REQUEST Ensure that this User s Manual is handed over to the user before the product is used Copying or duplicating this User s Manual in part or in whole is forbid den The information and specifications in this User s Manual are sub ject to change without notice Considerable effort has been made to ensure that this User s Manual is free from inaccuracies and omissions If you should find any inaccuracies or omissions please contact Yamatake Corporation In no event is Yamatake Corporation liable to anyone for any indirect special or consequential damages as a result of using this product 2004 Yamatake Corporation ALL RIGHTS RESERVED HI SAFETY PRECAUTIONS W E About Icons Safety precautions are for ensuring safe and correct use of this product and for preventing injury to the operator and other people or damage to property You must observe these safety precautions The safety precautions described in this manual are indicated by various icons As the following describes the icons and their meanings be sure to read and understand the descriptions before reading this manual N WA R N N G Warnings are indicated when mishandling this product might result in death or serious injury to the user N CA U TI O N Cautions are indicated when mishandling this product might result in minor injury to the user or only physi
33. nge Remarks aces PW acces a w Digital instantaneous 0 to 100 FS 1401 4401 The value with excluded flowrate SP 0 L min standard decimal point of flow L min Digital instantaneous 0 to 100 FS 1402 4402 standard multiplied by the flowrate SP 1 L min standard parent tull scale Mow bracket Digital instantaneous 0 to 100 FS 1403 4403 flowrate SP 2 L min standard Digital instantaneous 0 to 100 FS 1404 4404 flowrate SP 3 L min standard E Integrated flowrate related data Display Data range EEPROM Remarks pases Rw Ades RW Integrated SP setup 0 to 9999 1601 4601 Same as RAM address 2217 lower 4 digits and 5217 in parameter set up Integrated SP setup 0 to 9999 1602 4602 Same as RAM address 2218 upper 4 digits and 5218 in parameter set up Integrated PV setup 0 to 9999 1603 4603 When resetting the integrate lower 4 digits value make sure to write 0 Integrated PV setup 0 to 9999 1604 4604 for the both lower and upper upper 4 digits digits d 5 5 Chapter 5 COMMUNICATION DATA TABLE E Function setup related data EEPROM m ane a R w adress n w Key lock Operation mode selection selection by key operation Instantaneous flow rate setup method instantaneous SP setup method selection Number of instanta neous flowrate setups selection number of instantaneous SPs selection Instantaneous flowrate analog in put voltage range selection SP analog input voltage r
34. no data and cannot be normally read A warning response s indicates the warning code numeric Termination code ek error Em sen en Jer ooh on srx o ojo xf s fer ro 99 og u Sag Data link layer Application layer Data link layer E Decimal numeric expression numeric data Role All the numeric read count write value and read data in the data address follow the rules given below 1 When a numeric is negative prefix the numeric with a minus sign 2DH O Example 123 2DH 31H 32H 33H 2 When a numeric is 0 use one 0 FI Example 0 30H 00 30H 30H is not allowed 3 When a numeric is positive never prefix the numeric with a plus sign O Example 123 2BH 31H 32H 33H is not allowed 4 Never add additional 0 s or spaces before a numeric O Example 0123 30H 31H 32H 33H is not allowed 123 20H 31H 32H 33H is not allowed 4 9 Chapter 4 COMMUNICATION PROCEDURE 4 5 Data Write E Description of write instruction This instruction permits the contents of continuous data addresses starting with 4 10 the specified start data address to be simultaneously written in one message The application layer of a write instruction consists of the following three types of data Write command Write data 1st data item Start data address Write data 2nd data item ee 0 0 xX WS i 1 0 0 1 W 2 6 5 STX 0 1 Data link
35. nstruction message All data in the application layer is expressed in decimal character code O Termination code Role A numeric which specifies how the instruction message has been processed by the instrument Different values are set according to the processing result lt gt Description The response message must include a termination code The termination codes are classified as follows Ferran eos orma The termination code is a 2 digit decimal Error O Normal response 4 Role Sends back the read data e Data items are delimited with a comma character code 2CH Each data range and number of digits depend on the read data Digit without a decimal point is used for read data O Example 20 0 is converted to 200 when entered A normal response when two data items are read properly Termination code 00 normal Read data sr o 1fofo xfojof 2 3 8 7 ojemre sforjee Data link layer Application layer Data link layer O Alarm response A warning response 3 indicates the warning code numeric Termination code K warning Read data 0241304 ath 20H son acn 204 20H 90m 271 a0r ooh 77H 771 oof on sm of Pofo xf fo js 7 fend gt 2 or Data link layer Application layer Data link layer 4 8 O Error response Chapter 4 COMMUNICATION PROCEDURE Indicates that there is an abnormality in an instruction message which contains
36. point display position of integrated flowrate ROQON O ROUN O No decimal point 1003 x 4003 x XXXX XXX X XX XX X XXX No decimal point 1004 X 4004 X gt XXXXXXXX gt XXXXXXX X gt XXXXXX XX gt XXXXX XXX The meaning of R W column marks O Possible X Impossible Data range EEPROM Remarks Pas A w Ades a w User Setting 1001 X 4001 X X Change in gas type is possible Nitrogen Air with the function setup Argon Address 5018 Carbon dioxide Full scale flow Son on each 1002 XxX 4002 flowrate range The value with excluded decimal point 5 3 Chapter 5 COMMUNICATION DATA TABLE E Operating status related data Display Data range EEPROM Remarks races rw Ades a vw Alarm status bit Refer to 1 1201 X 4201 x x Status is shown in decimal numbers Event status bit Refer to 2 1202 X 4202 x x Status is shown in decimal numbers Control status bit Refer to 3 1203 xX 4203 Status is shown in decimal numbers Operation mode Valve full close 1204 4204 Can not write when the valve Valve control is in full close or full open Valve full open resulted forcibly by external inputs Instantaneous SP E 1205 4205 Can not write when SP No No in use switching is being selected by external inputs The number larger than the one being selected with SP No Address 5004 of the function setup can not be written Instantaneous 0 to 100 FS
37. r unit as a result of operation or unit status after completion of operation This indicates 7 segment indication on the setup display This indicates an LED lamp on the setup display This indicates a key on the setup display vii Capter 1 INTRODUCTION The MPC series hereafter referred to as slave station are able to communicate with personal computer or PLC as a host computer hereafter referred to as master station about setup value and data throgh RS 232C RS 485 converter In the RS 485 system up to 31 units can be connected with one master station The station address is used to identify slave station for communication To write a setup value or read a monitor from master station to slave station you must write a communication program for this purpose e When the following procedure is completed during communication various data for the controller can be read or written 1 The master station transmits a request message to the slave station 2 The master station receives a response message from the slave station The commands from master station to slave station are classified into two types read and write e The type of read write data can be selected by data address RS 232C port Personal Computer D SUB 9 pin SS gt nn RS 232C RS 485 O converter 2 CMC 10L i RS 232C RS 485 3 wire system This unit Max 31 units The CMC1
38. ritten return true telsef return false bool Read unsigned char Buffer unsigned long SizeToRead 1 unsigned long ReadSize unsigned long ErrFlag gt BOOL rt unsigned char RecvMesg BUFFERSIZE unsigned char cptr unsigned long i unsigned long stime unsigned long dtime unsigned long Error unsigned long Size COMSTAT Stat ReadSize ErrFlag dtime if handle void Oxffffffff return false stime GetTickCount dot ClearCommError handle amp Error amp Stat ifC Stat cbInQue gt ZeroMemory RecvMesg BUFFERSIZE rt ReadFile handle RecvMesg Stat cbInQue amp Size 0 RecvMesg Stat cbInQue 0x00 ifC Irt X clear error flag ClearCommError handle amp Error amp Stat set a argument error flag ErrFlag Error return false for cptr 8RecvMesg 0 i 0 cptr lt amp RecvMesg Stat cbInQue cptr i 1f SizeToRead 0xFFFFFFFF ifC cptr 0x02 ReadSize Q Buffer ReadSize cptr telsef ifC cptr Yn J Buffer ReadSize cptr ifC Buffer ReadSize 2 Yr XY Buffer ReadSize 0x00 goto OutOfWhile Buffer ReadSize cptr Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION Jelse Buffer ReadSize cptr ifC C ReadSize gt SizeToRead goto OutOfWhile I Sleep 1 dtime GetTickCount stime Iwhile SizeToRead gt ReadSize amp amp dtime lt TIMEOUT
39. ss Flow Controller MPC Series Communication Functions Manual No CP SP 1154E This manual Those using the communication functions of the MPC series should read this manual This manual describes an outline of communications wiring communication procedures a list of MPC series communication data how to remedy trouble and communication specifications 111 Organization of This User s Manual This manual is organized as follows Chapier 1 Chapier 2 Chapier 3 Chapier 4 Chapier 5 Chapier 6 Chapier 7 Chapier 8 Appendix INTRODUCTION This chapter describes communication outline of the MPC series WIRING This chapter describes RS 485 wiring methods to make a communication link between the MPC series and other instruments SETTING This chapter describes MPC series communication settings COMMUNICATION PROCEDURE This chapter describes communication procedures message configuration data read write and signal timing operations COMMUNICATION DATA TABLE This chapter provides various data address tables for communications on the MPC series COMMUNICATION PROGRAM FOR MASTER STATION This chapter gives precautions for programming and an example of a com munication program for the MPC series TROUBLESHOOTING This chapter describes checkpoints to diagnose failures in MPC series communications SPECIFICATIONS This chapter lists communication specifications for the MPC series The append
40. ssage except for the checksum function e Use capital letters A to F in the hexadecimal numerics for the station address and checksum 4 5 Chapter 4 COMMUNICATION PROCEDURE 4 3 Application Layer E Outline 4 6 e The application layer contains instructions data number of data and termination code e In the application layer the instruction message and response message have a different structure e There are two types of instruction messages read instructions and write instru ctions Each of these instruction messages have their own responses e A termination code indicates how an instruction message has been processed Application layer Read instruction Command RS Instruction message Start data address Number of read data Command WS Write instruction Start data address Write data Termination code Read response Response message Read data Write response Termination code 4 4 Data Read E Description of read instruction Chapter 4 COMMUNICATION PROCEDURE e This instruction permits the contents of continuous data addresses starting from the specified start data address to be read in one message e The application layer of a read instruction consists of the following three types of data Read command L Start data address E Number of read data sn son si sz saa aj sae ose ne oa sr o 1 Pofo x a s frfo
41. sure to check the settings for communications type station address transmission speed and data format of the instrument E Running the sample program This program is used for reading and writing data When the program is executed the application layers of the instruction message and response message communicated are indicated command RS 1000W 2 result 00 0 0 command WS 1000W 2 result 00 Sample indication of execution results O Communication settings Call open and initialize the RS 232C serial port O Command execution Set a desired character string in command and call AppCPL 6 2 Chapter 6 COMMUNICATIN PROGRAM FOR MASTER STATION E Data read write sample program o Handling Precautions Yamatake assumes no responsiblity with regard to any trouble caused by using this program C Builder 5 Borland C bcc32 cpl cpp cygwin gcc gcc cpl cpp include lt stdio h gt include lt windows h gt pragma hdrstop define COMRESENDNUM 2 define BUFFERSIZE 4096 define TIMEOUT 2000 HANDLE handle unsigned long ErrorCode bool CheckSum bool AppCPL char tosend char received int Open void int Close void bool Write unsigned char Mesg unsigned long Size bool Read unsigned char Buffer unsigned long SizeToRead unsigned long ReadSize unsigned long ErrFlag void CPLSum unsigned char str int len unsigned char buf int main int ar
42. tail the data link layer and application layer E Data address concept 4 2 The MPC series uses data addresses to read and write data Data addresses allow data to be written and read to and from a corresponding address for the data 1001W 1002W 1003W See 5 2 Communication Data Table page 5 3 for information on the relationship between data and address Chapter 4 COMMUNICATION PROCEDURE 4 2 Data Link Layer E Description The data link layer contains eight types of basic message transmission information e The instruction message and response message have the same structure in the data link layer STX ETX Station address Checksum 7 vever bes CR LF evice ID code L LL aa srx o afofo x a s of of wf e fer aj a cn ir Data link layer Application layer Data link layer The following describes each function of the data link layer O STX Start of TeXt Role Indicates the beginning of a message lt gt Description Fixed at 02H When the instrument receives an STX it is identified as the first character of a new instruction message regardless of location with a message O Station address Role Specifies the destination station and allows communication with the specified station Description If 0 is set as the station address the communication function is disabled So to enable communication be sure to set an address value of 1 or more Two hexadecima
43. the slave station should be observed O Response time out The maximum response time from the end of the instruction message transmission by the master station until when the master station receives a response message from the slave station is 2 seconds 1 in figure So the response time out should be set to 2 seconds Generally when a response time out occurs the instruction message is resent For details see Chapter 6 COMMUNICATION PROGRAM FOR MASTER STATION O Transmission start time Transmission Instruction Response Instruction Response line message message message message 1 End of master station transmission Transmission start time of slave station 2s max For the master station the response time out after the end of instruction message transmission should e set to 2s 2 End of slave station transmission Transmission start time of master station 10ms min For the master station stand by for 10ms or more from the end of response message receipt to the start time of next transmission E RS 485 driver control timing specifications When the transmission reception on the RS 485 3 wire system is directly controlled by the master station care should be paid to the following timing Master station Driver control enable Den disable esd Effective Effective Transmission line Ey Gey instruction meskage 0 kl o 5 a 3 D 7 D Q 2 Slave station
44. tion Code Table E Normal and warning termination Termination Type Contents and action code o Normal Normal end 21 Alarm Wrote data in the address that could not be set in the communication due to the setup allotment by external switching inputs Continue the process without writing any in the concerned address 23 Alarm The Read is stopped due to access to the address outside the scope The Write is stopped due to access to the address outside the scope All messages are processed except the address outside the scope E Error termination 4 12 Termination Type Contents and action code 40 Error W has not been set at the address All messages are scrapped 41 Error WS or RS has not been set All messages are scrapped 43 Error ETX 03H is not set in the correct position is not set after the address All messages are scrapped 46 Error The address is erroneous All messages are scrapped 47 Error There is an error in the written numeric All messages are scrapped 48 Error There is an error in the written numeric Write has been executed except for the error address Error An undefined command or other message error All messages are scrapped Chapter 4 COMMUNICATION PROCEDURE Timing Specifications Timing specifications for instruction and response messages The following precautions regarding the transmission timing of instruction messages from the master station and response messages from
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