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Orion nCompass MC i4.3 - Future Design Controls

1. Char Code Decimal Binary Hex Char Code Decimal Binary Hex NUL Ctrl 0 00000000 00 Shift 2 64 01000000 40 SOH Ctrl A 1 00000001 01 A Shift A 65 01000001 41 STX Ctrl B 2 00000010 02 B Shift B 66 01000010 42 ETX Ctrl C 3 00000011 03 C Shift C 67 01000011 43 EOT Ctrl D 4 00000100 04 D Shift D 68 01000100 44 ENG Ctrl E 5 00000101 05 E Shift E 69 01000101 45 ACK Ctrl F 6 00000110 06 F Shift F 70 01000110 46 BEL Ctrl G 7 00000111 07 G Shift G 71 01000111 47 BS Ctrl H 8 00001000 08 H Shift H 72 01001000 48 TAB Ctrl 9 00001001 09 I Shift 73 01001001 49 LF Ctrl J 10 00001010 0A J Shift J 74 01001010 4A VT Ctrl K 11 00001011 OB K Shift K 75 01001011 4B FF Ctrl L 12 00001100 oc L Shift L 76 01001100 4C CR Ctrl M 13 00001101 0D M Shift M 77 01001101 4D so Ctrl N 14 00001110 0E N Shift N 78 01001110 4E SI Ctrl O 15 00001111 OF O Shift O 79 01001111 4F DLE Ctrl P 16 00010000 10 P Shift P 80 01010000 50 DCI Ctrl Q 17 00010001 11 Q Shift Q 81 01010001 51 DC2 Ctrl R 18 00010010 12 R Shift R 82 01010010 52 DC3 Ctrl S 19 00010011 13 S Shift S 83 01010011 53 DC4 Ctrl T 20 00010100 14 T Shift T 84 01010100 54 NAK Ctrl U 21 00010101 15 U Shift U 85 01010101 55 SYN Ctrl V 22 00010110 16 V Shift V 86 01010110 56 ETB Ctrl W 23 00010111 17 W Shift W 87 01010111 57 CAN Ctrl X 24 00011000
2. E1 Parameter Temperature Temperature Process Value Units C Units F Units Range Low 1 1 1 Range High 555 999 999 E2 Parameter Description Value p 0 Hours and Minutes 1 Minutes and Seconds 2 Units Minute 3 Units Hour E3 Parameter Description Value p 0 Hours and Minutes 1 Minutes and Seconds E4 Parameter Description Value p 0 Ramp 1 Soak 2 Jump 3 End E5 Parameter Description Value p Bito Event 1 Bit1 Event 2 Bit2 Event 3 Bit3 Bit15 Not Assigned nCompass MC Loop Controller Data Registers j FUTUREDESIG A T L Note The last step of an automatic program must be an end step If the last step is not an end step the program will not run correctly and or a program download error will occur and the program will not operate Note The available system events are based on the configuration of the specific loop controller that the program is being downloaded to FDC nCompass 5 7 j FUTUREDESIC ts nCompass E6 Farameter Description Value P 0 Holdback Disabled 1 Deviation Low Holdback 2 Deviation High Holdback 3 Deviation Band Holdback F The unit PV means that the unit of the parameter is the same as the unit of PV the loop configuration Use caution when loading an automatic program to nCompass You must insure that the decimal point scaling and units of measurement in the program match the loop setting Loading a p
3. A 4 FDC nCompass APPENDIX j FUTUREDESIC A T L nCompass How to Order nCompass MC is ordered as 3 to 12 components dependant upon the number of control loops one to ten nCompass MC Sample Part Numbers minimum of 3 component part numbers is required 1 display 2 firmware 3 loop 1 Description 4 3 display MC software 11 36 VDC power input SD slot Ethernet standard enclosure Item Product 1 Display Sample Part Number FDC 0450 1011 000BN MC Firmware SD MC Loop 1 B42 4166 11D0 MC Loop Control Firmware inserted into display SD slot 90 250VAC power input T C or RTD input output 1 1A Triac output 2 1A Triac output 3 relay output 4 relay comms no display Loop 10 B42 4366 11D0 90 250VAC power input mA input output 1 1A Triac output 2 1A Triac output 3 relay output 4 relay comms no display Options Power Supply PS5R SD24 Cable CA2011 3D 85 264VAC power input Output 24VDC 15W 0 6A Cable from display to B42 DB25 connector display twisted pair leads B42 shielded 10ft Item 1 Model FDC 0450 4 3 Color Touch Screen i IQ CIGIG GG Order Matrix 1 2 1 Power Input 6 Software 1 11 to 36 VDC 0 None 2 Sound Output 0 None 3 SD Card Slot 1 Yes 4 Ethernet 1 Yes 5 Network 0 None 7 Enclosure 0 Standard 8 Overlay Color B Black Overlay 9 Special Code N Neutral Overlay no name logo Loop Control Firmware O
4. 4 1 Interface Standards sesaosan RR 4 2 4 1 1 Interface CONveNnter aisiiniroooitizoovfzil do ov nr ra ra Tuna 4 3 42 Protocol naea O PROP SVR OPOP a O ooo 4 4 4 3 Creating your own Modbus Application 2 2 4e eeeeeeeeeeee eee eee een eee eee en een ent 4 6 4 3 1 Faek VAK aE E I ra al eden elite edie eto ae epee 4 7 4 3 2 Error CHECKING reri Era AEE E fur rola ln fan 4 10 4 3 3 Transmitting and Receiving Messages o oroocnnno ono r nn 4 11 5 nCompass MC Loop Controller Data Registers cccccceeeeeeeeseeeeeeeeeeeeeeeeeeeees 5 1 9 1 Control Registers oesreste EE ia Vydala vy ka k brian val E v ala 5 2 5 1 1 Communicating with Loop Controllers on nCompass eeeenronnvononi on er rr 5 5 9 2 Automatic Program RegISTE S v 2zioovica larva l va ev Hate vlavo vias V EEE 5 6 9 2 1 Starting an Automatic Program on nCompass ooounonovon noo rn r rim 9 8 Appendix Terms and Definitions Order Matrix and Replacement Parts Software License Software Usage Note Warranty Returns Table of Contents FDC nCompass i j FUTUREDESIG nCompass oe NT L 1 What is nCompass The nCompass system combines all of the features of a loop controller video chart recorder and data logging system into a single intuitive device Email SMS text messaging FTP file transfer protocol for automated data backup and remote view control Web server VNC server are
5. 5 nCompass MC Loop Controller Data Registers Some of the values contained in the nCompass loop controller register base contain bit oriented values This means that each bit of the word indicates an on off status for a specific setting or condition In handling these values it is recommended that the word be converted to its binary equivalent By converting the value to its binary equivalent it produces a Boolean array of true bit on 1 and false bit off 0 values This allows each bit to be examined individually In the same manner creating a Boolean array of 16 bits produces an equivalent hexadecimal value that can be sent to nCompass in order to set a control register For the purpose of this manual parameters defined as bit oriented will have the function of each bit associated with the bit s index number in the data word The index number is equal to that of a typical array function Thus an index number of zero selects the first bit in the word LSB An index number of 1 selects the second bit in the word and so on This helps eliminate offset selection errors that may occur when coding software and using array functions to select which bit in the word that is required for examination Data Register 1 word 16 bits 90900000000000000 Index Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bits Bit Bit6 Bit5 Bit4 Bit3 Bit2 Bitl Bit Adhere to the following lists of registers and their allowable data ranges
6. controller address 1 byte oo write command 0x06 register high byte register low byte data high byte data low byte CRC low byte CRC high byte Example Write register 41 loop 2 set point of controller at address one configured with no decimal point to 75 degrees 0x004B Sent 01 06 00 29 00 4B 18 35 Received 01 06 00 29 00 4B 18 35 4 8 FDC nCompass Serial Communication j FUTUREDESIG AH T L nCompass Write Registers Command 0x10 This command writes values to multiple registers in sequential order It is used for automatic program download only to transmit program data one step at a time to nCompass See the Automatic Program Parameters section for the list of registers and their use If this command is used to write to registers other than the correct program step registers nCompass will respond with an acknowledgment that the message was received however the command will not be executed Packet sent to nCompass nn 10 nn nn nn nn nn nn NN NN NN nn nn controller address 1 byte write command 0x10 starting register high byte starting register low byte number of registers to write high byte number of registers to write low byte number of data bytes data high byte data low byte register n data high byte register n data low byte CRC low byte CRC high byte Packet returned from nCompass nn 110 nnnn n
7. If more than one nCompass controller is to be placed on the communication link with a PC an RS232 485 converter will be reguired for each nCompass and the PC in order to convert the RS232 communications port to RS485 multi drop communications network for connecting multiple nCompass controllers on the PC communications link Communications Wiring FDC nCompass 2 1 PH A T J FUTUREDESIGN nCompass To next nCompass TX1 i US Converters R5232 to R5485 Converter part no X52014 US Converters RS232 to R5485 Converter part no X52014 FDC SNAIOA RS232 to RS485 Network Adapter RS 232 T R PO CD Ae a NOTE The connection reguires a single twisted pair cable that is daisy chained from one nCompass to the next When using shielded twisted pair cable be sure to ground only when end of the cable preferably at the RS232 to RS485 network adapter Allowing any other portion of the cable shield to come in contact with ground or grounding both ends will cause ground loop currents to flow in that section of the cable which can cause communication errors 2 2 FDC nCompass Communications Wiring j FUTUREDESIG nCompass oe aT L 3 Communication Basics The purpose of this document is to provide users interested in using data communications with the nCompass MC the ability to set up and use a simple network of one or more nCompass control systems by providing a basic understanding of data communications using stand
8. P The following 10 registers of the automatic program contain the data for step 1 of the program Register z i E Pange F Adec Parameter Description Type Low High Unit 91 0x005B Step Number W 0 63 92 0x005C Step Type W i 93 0x005D Ramp Target Setpoint W 32768 32767 PV 94 0x005E Ramp Time or Ramp Rate W 0 5999 95 0x005F Event Selections 1 2 3 W ES ES 96 0x0060 Holdback Type W A TEG 97 0x0061 Dwell Time W 0 9999 98 0x0062 Jump Step W 0 63 99 0x0063 Jump Cycles W 1 9999 100 0x0064 Final Setpoint W 32768 32767 PV The Step Number must be offset by 1 when writing step data to nCompass Steps 1 64 will be sent with the step number as a value of 0 63 1 offset All remaining steps of the program follow the same format and data structure as is represented for step one above Each step of the program is downloaded to the same registers 91 to 100 The step number in register 91 designates the step that the data is for on each write command Since few if any programs will contain the maximum of 64 steps it is only necessary to write the step data for the number steps used in the automatic program 56 FDC nCompass nCompass MC Loop Controller Data Registers nCompass Notes D W Specifies write only data
9. DO NOT attempt to write to any other register number than those listed DO NOT write to registers that are for options your controller does not have Failure to adhere to this reguirement can result in erratic control andlor damage to eguipment All register numbers are listed in relative values To convert to absolute values add 400001 nCompass MC Loop Controller Data Registers FDC nCompass 5 1 j FUTUREDESIC T ts nCompass 5 1 Control Registers Data Register Address Parameter Description A Pange 2 S Type Low High Unit O 0x0000 Controller Set Point Static Mode W 32768 32767 Si 1 0x0001 Current Program Segment Number RW B1 B1 0x0005 Set Point for Alarm 1 RW 32768 32767 1 0x0006 Set Point for Alarm 2 RW 32768 32767 s 0x0007 Set Point for Alarm 3 RW 32768 32767 Ci 9 0x0009 Input Unit Selection R Be 10 0x000A Decimal Point Selection R 0 3 11 0x000B Operation Mode R W B3 B3 127 0x007F Manual Event Output RW s BE ee 128 0x0080 Process Value PV R 32768 32767 C1 129 0x0081 Set Point Value SV for Control R 32768 32767 Ca 130 0x0082 Output 1 Percentage Value MV1 R W 0 00 100 00 131 0x0083 Output 2 Percentage Value MV2 RW 0 00 100 00 132 0x0084 Mode and Operational Status R B5 B9 133 0x0085 Error Code R BO SB 134 0x0086 Current P
10. If shielded cable is used terminate the shield at one end only Always follow the manufacturer s instructions supplied with the interface converter See Biasing of Buses next Biasing of Buses The EIA 485 standard requires the bus to be biased for reliable communication This requires termination resistors to be placed across the T R and T R wires One resistor is placed at the PC where it connects to the EIA 485 bus The second resistor is placed at the last controller on the network Do not place resistors at each controller The impedance of the wires used for the bus determines the resistor value For twisted pair the value is typically 120 ohms In addition it may be necessary to have a pull up and pull down resistor between the power supply and ground of the interface adapter Check the documentation that came with your interface adapter Biasing the bus reduces reflection of signals sent down the bus These reflections are sometimes referred to as a standing wave This condition is most notable when communicating at high baud rates over longer distances 4 2 FDC nCompass Serial Communication j FUTUREDESIG nCompass oe NT L 4 1 1 Interface Converters The purpose of an interface converter is to allow two different buses to be connected together Interface converters are required when connecting an EIA 232 port to an EIA 485 bus The EIA 485 bus is a half duplex bus This means that it can only send or receive data at any
11. SP values may be individually active or not Guaranteed Soak amp Ramp GS Range 1 to 999F 555C configurable per step as low high band or inactive disable Power Fail Recovery when Profile is active Continue from last SP value Continue from last PV value Static mode abort profile with last static SP entered Profile Segments maximum of 64 Jump To Segment configurable by segment also nested looping Events up to 3 events per segment Guaranteed Soak amp Ramp Configurable active or not by segment Note The number of events available is predicated on the control board hardware number of control boards and configuration Event Input profile specific refer to B42 Control Board for all options Configurable functions below mutually exclusive to each other Profile Run momentary Profile Hold closed profile hold open profile run Profile Run Hold closed profile run open profile hold Step Advance momentary Profile Abort momentary Although the Event Input provides a manner to control Profile functions remotely typically Profile actions would have the Operator using the intuitive easy to use 4 3 color touch screen operator interface NOTES Power Supply Optional Power Capacity Required Watts A base system requires 10 watts of 24Vdc power for the nCompass user interface The 15W power supplies offered are sufficient to power display only Note The p
12. ability to send and receive data at the same time The same as duplex GPIB See IEEE488 Half Duplex The ability to send or receive data but not at the same time To listen or talk but not both at the same time Handshake Handshaking Exchange of predetermined signals between two devices establishing a connection Using extra wires or software signals to coordinate communications signals can be sent to tell the transmitter the current status of the other device receiver Example Are you busy or are you ready Hex or Hexadecimal Number based system where sixteen characters exist 0 to 9 A to F Counting is 0 9 A B C Integer Two bytes make an integer This contains 16 bits An integer can represent a decimal value of 32768 to 32767 Logic Level A voltage measurement system where only two stable voltage values exist Example Ov and 5V or 3v and 3v Mark Represents the transmission of data bit logic 1 see logic level Usually this is the most negative voltage value in serial communications Master The device on the bus that controls all communications Only the master can initiate conversation Modbus A software protocol developed by Gould Modicon now AEG for process control systems No hardware interface is defined Modbus is accessed on the master slave principle the protocol providing for one master and up to 247 slaves Only the master can initiate a transaction This is a half
13. are the CRC that nCompass appended to the message Do not include them when calculating the CRC 4 10 FDC nCompass Serial Communication j FUTUREDESIG nCompass oe NT L 4 3 3 Transmitting and Receiving Messages In order to reliably communicate with nCompass it is important to develop an efficient means of transmitting and receiving messages Modbus is a structured protocol and it must be properly followed It is recommended if possible to locate an existing communication driver to incorporate into your software Developing one from scratch can be challenging However if one is not available or you choose to develop one yourself the following guidelines may be of assistance Transmitting Messages When sending a message to nCompass it is important to remember that Modbus RTU protocol does not have start of transmission or end of transmission characters All messages are framed using timeouts between characters nCompass uses its own fixed timeout setting of 135ms Thus if the entire message is not received by nCompass within 135ms it will discard the data it has received and assume the next data byte received is the start of the next valid message The timeout must be considered carefully when developing your application In creating your message there are several steps that must be executed in order to build the packet and format the data properly into hexadecimal to send out the serial port of your PC If you write code
14. data to its correct value This can be accomplished through several methods parity checksum and CRC cyclic redundancy checksum are three of these Cyclic Redundancy Checksum is an error checking mechanism using a polynomial algorithm based on the content of a message frame at the transmitter and included in a field appended to the frame At the receiver it is then compared with the results of the calculation that is performed by the receiver Data The information that is transferred across the communications bus This may be a setpoint setup parameter or any character This information is transferred to an address or register DB 9 A standardized connector shaped like the letter D when viewed on edge This connector has 9 contacts It is utilized on most IBM AT compatible PCs as the serial port Decode This is the reverse of encode When a piece of data has information embedded in it decode is to extract that information Example to extract an A from 01000001 Duplex The ability to send and receive data at the same time To listen and talk at the same time EIA 232 Electronic Industries Association developed this standard hardware interface to allow one device to talk to another device in full duplex mode This method uses a differential voltage between one wire and ground Also called an unbalanced system since the ground wire carries the sum of current of all lines Transmission is limited to about
15. digit and each punctuation mark we use ASCII The ASCII code defines 128 separate characters one for each letter digit and punctuation mark ASCII also includes control characters similar to those we find on computer keys such as backspace shift and return It also has nine communications control characters for identification enguiry inguiry start of text end of text end of transmission acknowledge negative acknowledge and escape The ASCII code is sometimes written in a base 16 number system that is called hexadecimal or hex for short The numbers 0 through 9 represents the first ten digits of this system and the letters A through F represents the final six digits The 128 ASCII character codes with the decimal binary and hexadecimal eguivalents are listed in the following table ASCII Control Codes ASCII Control Codes are used to give instructions to the remote device and result in specific actions such as a line feed instruction on a printer ASCII Control Codes the first 33 ASCII characters non printable are important for the operation of communicating eguipment They give instruction to remote devices that result in specific actions such as a line feed on a printer Holding down the keyboard control key while pressing the appropriate keyboard key is what sends these values Communication Basics FDC nCompass 3 1 f FUTURE 3 2 Z T AI ASCII Character Chart nCompass
16. standard with nCompass and can be accessed via LAN WAN using a PC tablet or smart phone device Future Designs nCompass provides a 4 3 color touch screen interface with standard Smart Device user interface features for one to ten loop OEM control applications All loop configuration and runtime user access is configurable at the device with no PC software required OEM s have the ability to configure runtime features screen availability menus language etc to easily customize the system for their requirements These configurations can be imported exported to any other nCompass single dual loop device for setup from scratch within minutes Individual high performance board level PID loop control boards one for each loop offer up to four control outputs each powerful profiling capabilities with up to three events and full auto tune functionality with high resolution process inputs 1 1 Features Each of the nCompass loop control boards provide a single digital input that can be programmed as a automatic program control input for run hold or abort a manual mode or failure transfer control input or a program advance to next segment control input Each of the loop control boards also provide up to four control outputs which can be used as PID control outputs for heat cool direct outputs for controlling external equipment related to the application through software switches called events or be programmed to act as system ala
17. value 0xA001 5 Repeat steps 3 and 4 until eight shifts have been performed When this is done a complete 8 bit byte will have been processed 6 Repeat steps 2 through 5 for the next 8 bit byte of the command message Continue doing this until all bytes of the command message have been processed The final contents of the CRC register is the CRC value When transmitting the CRC value in the message the upper and lower bytes of the CRC value must be swapped i e the lower order byte will be transmitted first 44 FDC nCompass Serial Communication j FUTUREDESIG nCompass oe NT L Example Cyclical Redundancy Checksum CRC Algorithm unsigned int calc_crc unsigned char start of packet unsigned char end of packet unsigned int crc unsigned char bit_count unsigned char char_ptr Start at the beginning of the packet char_ptr start_of_packet Initialize CRC crc OxFFFF Loop through the entire packet do Exclusive OR the byte with the CRC crc unsigned int char ptr Loop through all 8 data bits bit_count 0 dof If the LSB is 1 shift the CRC and XOR the polynomial mask with the CRC if crc 8 0x0001 crc gt gt 1 crc 0xA001 If the LSB is 0 shift the CRC only else crc gt gt 1 while bit count lt 7 while char ptr lt end of packet return crc Serial Communication FDC nCompass 4 5 j FUTUREDESIC HP A T
18. value does not include the 2 bytes for the CRC Thus when reading in the rest of the message you will read in the number of data bytes plus an additional two in order to get the CRC You can then calculate the CRC for the message and compare it to the last two bytes If they match the data you received is valid Serial Communication FDC nCompass 4 11 j FUTUREDESIG ts nCompass Read 2 bytes from serial port and check value of second byte Read Write Exception Command NO Command NO Response 0x03 0x06 10 0x8 YES YES YES Read 1 byte from serial Read remaining 8 bytes Read remaining 3 bytes port and obtain number of from serial port to obtain from serial port to obtain data bytes in message complete message complete message Read in number of data Calculate the CRC for the bytes from message plus 2 message and compare to additional CRC bytes CRC received Received message is valid If the message was a read response the data can be Was it an extracted and converted exception for use within the software response If the message was a write response nCompass executed the command YES NO Enter recovery mode and resend command message in Disregard message attempt to get valid response and or alert operator of a transmission error communication failure in order to take appropriate action 4 12 FDC nCompass Serial Communication j FUTUREDESIG nCompass oe NT L
19. 18 X Shift X 88 01011000 58 EM Ctrl Y 25 00011001 19 Ne Shift Y 89 01011001 59 SUB Ctrl Z 26 00011010 1A Z Shift Z 90 01011010 BA ESC Ctrl 27 00011011 1B 91 01011011 5B FS Ctrl 28 00011100 1C 92 01011100 5C GS Ctrl 29 00011101 1D 93 01011101 5D RS Ctrl A 30 00011110 1E B Shift 6 94 01011110 SE US Ctrl _ 31 00011111 1F E Shift 95 01011111 5F SP SPACE 32 00100000 20 96 01100000 60 Shift 1 33 00100001 21 a A 97 01100001 61 j Shift 34 00100010 22 b B 98 01100010 62 Shift 3 35 00100011 23 c C 99 01100011 63 Shift 4 36 00100100 24 d D 100 01100100 64 Shift 5 37 00100101 25 e E 101 01100101 65 amp Shift 7 38 00100110 26 f F 102 01100110 66 i 39 00100111 27 g G 103 01100111 67 Shift 9 40 00101000 28 h H 104 01101000 68 Shift 0 41 00101001 29 l 105 01101001 69 k Shift 8 42 00101010 2A j J 106 01101010 6A Shift 43 00101011 2B k K 107 01101011 6B o 44 00101100 2C l L 108 01101100 6C 45 00101101 2D m M 109 01101101 6D o 46 00101110 2E n N 110 01101110 6E I 47 00101111 2F o O 111 01101111 6F 0 0 48 00110000 30 p P 112 01110000 70 1 1 49 00110001 31 g a 113 01110001 71 2 2 50 00110010 32 r R 114 01110010 72 3 3 51 00110011 33 s S 115 01110011 73 4 4 52 00110100 34 t T 116 01110100 74 5 5 53 00110101 35 u U 117 01110101 75 6 6 54 00110110 36 v V 118 01110110 76 7 T 55 00110111 37 w W 119 01110111 77 8 8 56 00111000 38 x X 120 01111000 78 9 9 57 00111001 39 y Y 121 01111001 79 g Shift 58 00111010
20. 3A z Z 122 01111010 TA 5 59 00111011 3B Shift 123 01111011 7B lt Shift 60 00111100 3C Shift 124 01111100 7C 61 00111101 3D Shift 125 01111101 TD gt Shift 62 00111110 3E F Shift 126 01111110 TE Shift 63 00111111 3F DEL Delete 127 01111111 TE FDC nCompass Communication Basics j FUTUREDESIG nCompass oe NT L 4 Serial Communication The user communications interface for nCompass employs serial communication which is the exchange of data in a one bit at a time sequential manner on a single data line or channel Serial contrasts with parallel communication which sends several bits of information simultaneously over multiple lines or channels Not only is serial data communication simpler than parallel it is also less costly Baud Rate The baud unit is named after Jean Maurice Emile Baudot who was an officer in the French Telegraph Service He is credited with devising the first uniform length 5 bit code for characters of the alphabet in the late 19th century What baud really refers to is modulation rate or the number of times per second that a line changes state This is not always the same as bits per second BPS However if you connect two serial devices together using direct cables then baud and BPS are in fact the same Thus if you are running at 9600 BPS then the line is also changing states 9600 times per second Typical baud rates used for computers are 300
21. 50 feet A 2 FDC nCompass APPENDIX j FUTUREDESIG nCompass oe NT L EIA 485 Electronic Industries Association developed this standard hardware interface to allow up to 32 devices to be on a bus at one time This method uses a differential voltage between two wires Also called a balanced system since each wire carries the same current value This has the advantage of being immune to outside electrical disturbances EIA TIA 232 and 485 Data communications standards set by the Electronic Industries Association and Telecommunications Industry Association Formerly referred to as RS Recommended Standard See EIA 232 and ElA 485 Electronic Industries Association EIA An association in the US that establishes standards for electronics and data communications Encode To embed information into a piece of data This is the reverse of decode Example let 01000001 stand for an A Error Correction When an inconsistency is in the data a method is used to detect and or return the data to its correct value This can be done through several methods parity checksum and CRC cyclic redundancy checksum area three of these Even This term is used with parity See parity Firmware Instruction or data stored in an IC integrated circuit or on a read only disk This data is programmed once and cannot easily be changed as software can Full Duplex Full is used to mean the duplex s full capability The
22. 600 1200 2400 4800 9600 14400 19200 38400 57600 and 115200 baud As the baud rate increases so does the transmission rate of data Thus you get more information in a shorter period of time However the faster the transmission rate the more susceptible it is to error due to the quality of the cable and sources of electrical noise in the environment To provide the best balance between speed and noise immunity nCompass uses a baud rate of 9600 baud In order for a device to communicate with nCompass it must have its serial port set for 9600 baud in order for data communications to work properly Start and Stop Bits The start bit informs the receiving device that a character is coming and a stop bit tells it that a character is complete The start bit is always a0 The stop bit is always a 1 The human speech equivalent of these bits could be a clearing of the throat to get someone s attention start bit and a pause at the end of a phrase stop bit Both help the listener understand the message A stop bit has a value of 1 or a mark state and it can be detected correctly even if the previous data bit also had a value of 1 This is accomplished by the stop bit s duration Stop bits can be 1 1 5 or 2 bit periods in length nCompass uses the default and most common length of 1 period for the stop bit A device used to communicate with nCompass must also have its serial port set to use a stop bit of 1 in order for data comm
23. C isolated Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12VDC 40 ma Isolated Transmitter power supply 5VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma 7 Output 5 D RS 485 Modbus RTU interface Isolated 8 Display Board and cable 0 None 3 Display Board with 300mm connection cable 4 Display Board with 1000mm connection cable 9 Modbus Addressing if blank factory defaultis Modbus address 1 CA Modbus Comm Address 1 CB Modbus Comm Address 2 CC Modbus Comm Address 3 Note that field configuration of Comm address requires the optional display 4 5 0 1 2 3 4 6 c 0 1 2 3 4 6 7 8 A c 0 1 2 6 7 8 A c OBONORBRUN OOGE A 6 FDC nCompass nCompass Item 4 12 B42 Loop Control Board Loop 2 10 2 I U U U Io U Order Matrix 1 1 Power Input 4 90 250 VAC 47 63 HZ 5 11 26 VAC or VDC consult factory for availability 2 Signal Input 18 bit AID 1 Standard Input Thermocouple J K T E B R S N L C P RTD PT100 DI PT100 JIS Voltage 0 60mV 5 0 10V 0 1V 0 5V 1 5V 6 0 20 4 20mA 9 Special Order 3 Output 1 0 None 1 Relay rated 2A 240VAC SPST 2 SSR Driver 5 VDC 30 Ma 3 4 20mA 0 20mA Isolated 4 1 5V 0 5V 0 10V Isolated 6 Triac output 1A 240VAC SSR C SSR Driver 14 VDC 40 Ma 4 Output 2 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma 4 20mA 0 20mA Isolate
24. EDESIG ts nCompass 4 2 Protocol Protocol describes how to initiate an exchange It also prevents two machines from attempting to send data at the same time There are a number of different data communications protocols just as there are different human cultural protocols that vary according to the situation The protocol portion of nCompass communications is very important because it provides a quality of communication that others often don t have Protocol driven communications are more accurate because they are less prone to both operator and noise errors Protocol maintains system integrity by requiring a response to each message It s like registered mail you know that your letter has been received because the post office sends you a signed receipt In nCompass data communications a dialog will continue successfully as long as the messages are in the correct form and responses are returned to the protocol leader If the operator enters an incorrect message or interference comes on to the data line there will be no response In that case the master must retransmit the message or go to a recovery procedure If an operator continues to enter an incorrect message or interference continues on the data line the system will halt until the problem is resolved nCompass uses Modbus RTU as the protocol of choice Modbus RTU enables a PC to read and write directly to registers containing the nCompass parameters With it you can read all of t
25. Future Design Controls SOFTWARE system A 8 FDC nCompass Appendix j FUTUREDESIG nCompass oe NT L Software Usage Note The selection application and use of Future Design Control products or software is the sole responsibility of the purchaser or end user No claims will be allowed for any damages or losses whether direct indirect incidental special or consequential In addition Future Design reserves the right to make changes without notification to purchaser or user to materials or processing that do not affect compliance with any applicable specification Future Design makes no warranties when using the nCompass system Warranty Future Design Controls products described in this book are warranted to be free from functional defects in material and workmanship at the time the products shipped from Future Design Controls facilities and to conform at that time to the specifications set forth in the relevant Future Design Controls manual sheet or sheets for a period of one year after delivery to the first purchaser Future Design Controls FDC 0450 products are warranted to be free from functional defects in materials and workmanship at the time the products shipped from Future Design Controls facilities and to conform at that time to the specifications set forth in the relevant Future Design Controls manual sheet or sheets for a period of one year after delivery to the first purchaser for use There are no expressed or impli
26. M s with brand labels other than Future Design controls are not considered Future Design Controls products and cannot be used with Future Designs SOFTWARE Using Future Design s SOFTWARE with any other manufacturer or distributor of hardware is a violation of this license and applicable copyright laws The SOFTWARE is considered in use when it is installed into permanent or temporary memory e g CE display unit PLC or other storage device B Solely with respect to electronic documents included with the SOFTWARE you may make a copy either in hardcopy or electronic form provided that the software is not resold without the knowledge and acceptance of terms by Future Design Controls II TITLE COPYRIGHT All title and copyrights in and to the SOFTWARE including but not limited to any images photographs animation video audio music text and applets incorporated into the SOFTWARE the accompanying printed materials and any copies of the SOFTWARE are owned by Future Design Controls or its suppliers The SOFTWARE is protected by copyright laws and international treaty provisions Therefore you must treat the SOFTWARE like any other copyrighted material except that you may either A make one copy of the SOFTWARE solely for backup or archival purposes or B install the SOFTWARE on each system purchased from Future Design Controls CE display PLC provided you keep the original solely for backup or archival purposes You may not copy the pr
27. ad Function Code 11 Comm Error Register Out of Range 14 Comm Error Write Read Only Data 15 Comm Error Out of Range Data 25 Holdback Time Out 26 Auto Tune Error 27 Input Type Requires Calibration 29 EEPROM Error 30 Cold Junction Failure 39 Sensor Break 40 A to D Failure B7 R Description alue 26660 Reset Single Set Point Static Mode 26661 Reset Alarms 54 FDC nCompass ts nCompass Note Upon completion of an automatic ramp soak program the loop control will not return control to the static set point until the reset single set point static mode command value is written to the loop control Even though the static set point can be changed the loop controller will continue to use the last program set point until the reset command is received nCompass MC Loop Controller Data Registers j FUTUREDESIG nCompass oe NT L C1 The units of measure and range of a loop input is dependant upon the configuration of the input and or the units of temperature selection Celsius or Fahrenheit of the nCompass loop controller The decimal point position for the value is an implied value based on the configuration of the input Thus a register value of 345 can represent an actual process value of 345 34 5 3 45 or 0 345 depending upon the decimal point configuration of the loop 5 1 1 Communicating with Loop Controllers on nCompass The loop control register data table provides the list of available data fo
28. ard definitions interfaces and protocols In this manual numbers in the format 0x00 represent values in hexadecimal Numbers in the format 0 represent values in decimal and finally numbers in the format 00000000 represent values in binary unless otherwise stated 3 1 Explanation of Terms Machine to Machine Communication In order for machines to communicate with each other they need a code called a character format or character set They require rules called protocol to govern their conversation and prevent confusion and errors Computers need a connecting interface over which to communicate They may use one pair of wires to send information in one direction and another pair to send in the opposite direction full duplex or they may use one pair to send data in both directions half duplex Character Format The code or character format for nCompass data communications is shared by virtually everyone in the electronics industry This code defines a stream of 1 s and 0 s that are created by varying a voltage signal in a regular manner This code is the American Standard Code for Information Interchange called ASCII Bits and Bytes The word bit is simply the contraction of the words binary digit A bit is the basic unit in ASCII It is either a 1 or a 0 A byte is a string of eight bits that a computer treats as a single character ASCII can use a single byte to represent each letter of the alphabet each
29. d 1 5V 0 5V 0 10V Isolated Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12 VDC 40 ma Isolated Transmitter power supply 5 VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma Output 3 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12VDC 40 ma Isolated Transmitter power supply 5VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma 6 Output 4 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma Retransmission 4 20 0 20mA isolated Retransmission 1 5 0 5 0 10VDC isolated Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12VDC 40 ma Isolated Transmitter power supply 5VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma 7 Output 5 D RS 485 Modbus RTU interface Isolated 8 Display Board and cable 0 None 3 Display Board with 300mm connection cable 4 Display Board with 1000mm connection cable 9 Modbus Addressing if blank factory default is Modbus address 1 CA Modbus Comm Address 1 CB Modbus Comm Address 2 CC Modbus Comm Address 3 Note that field configuration of Comm address reguires the optional display 5 OBonNonN o OBONORUNAECO OBONORUNAC Appendix nCompass NOTES SCADA Supervisory Control 8 Data Acguisition FDC nCompass Series Graphic U
30. d the code provided in the response will tell you what the error was in the sent message However this is only valid if the controller receives the message you sent and there was an out of range value or simple transmission error in the message It does not validate incomplete or failed transmissions To insure that the data you receive from a read command is correct and that the controller properly received a write command you must parse the controllers response and validate the return message to insure it is correct In order to validate that the message you received is correct you must calculate the CRC for the received message and compare it with the CRC that the controller appended to the message This verifies that the data you received was what nCompass sent If the CRC s do not match there was an error in the transmission and the entire message should be ignored This could then be followed by an attempt to resend the failed command or halt operation and alert an operator Example Read registers 35 and 36 loop 1 process variable and setpoint of controller at address 1 Command sent to nCompass 01 03 00 23 00 02 35 CI Message received from nCompass 01 03 04 03 OD 01 F3 2A 61 Calculated CRC 2A61 calculated from message 01 03 04 03 OD 01 F3 Received CRC 2A61 The calculated CRC matches the received CRC the message is valid Note that the last two bytes of the received message are not used to calculate the CRC The last two bytes
31. duplex protocol APPENDIX FDC nCompass A3 j FUTUREDESIC PH A T ts nCompass Network When two or more devices share communication lines the devices are networked Node A point of interconnection to a network Noise Immunity The ability of communication lines to ignore electrical noise generated in the lines by nearby magnetic and electrostatic fields Odd This term is used with parity See parity Parallel Communication using this method transfers eight bits or one byte at a time over eight data wires and one ground wire This method is eight times faster than using serial but utilizes more hardware Parity A bit is assigned at the beginning of a byte to stand for parity When the 1 bits are counted the number will be even or odd A parity bit is used to ensure that the answer is always even if even parity or odd if odd parity If the receiving end counts the 1 bits and the sum is not the same odd or even an error is generated Parity is used to detect errors caused by noise in data transmission Protocol A set of rules for communication This will specify what method to transfer information packet size information headers and who should talk when It is used to coordinate communication activity Receive To accept data sent from another device The device that receives the data is the receiver Register An area of memory that provides temporary storage of digital data S
32. e When the loop control is in manual mode the output percentage values for output 1 MV1 and output 2 MV2 can be set by writing to the corresponding output register B4 Note The events provided by nCompass are a combination of all Parameter au 3 Val Description events provided by all loop controls combined In order to turn events ue k m on and off the events assigned to each specific control must be Bito Event 1 output 2 accessed The proper event bits must be turned on in each corresponding loop control Bit1 Event 2 output 3 Bit Event 3 output 4 The first event in nCompass may actually be output 3 of loop controller number 2 This reguires bit 1 of the event register to be set on loop Bit3 Bit15 Not Assigned controller 2 of nCompass nCompass MC Loop Controller Data Registers FDC nCompass 5 3 j FUTUREDE SI T B5 ae Description alue Bito Automatic Program Run Mode Bit1 Automatic Program Hold Mode Bit2 Static Mode Bit3 Auto Tune Mode Bit4 Manual Mode Bit5 Off Mode Bit6 Failure Transfer Bit7 Automatic Program Ramp Up Bit8 Automatic Program Ramp Down Bit9 Automatic Program Soak Bit10 Alarm 1 Active Bit11 Alarm 2 Active Bit12 Alarm 3 Active Bit13 Event 1 On Bit14 Event 2 On Bit15 Event 3 On B6 Description alue 0 No Error 4 Illegal Setup Values 10 Comm Error B
33. ed Warranties extending beyond the Warranties herein and above set forth Limitations Future Design Controls provides no warranty or representations of any sort regarding the fitness of use or application of its products by the purchaser Users are responsible for the selection suitability of the products for their application or use of Future Design Controls products Future Design Controls shall not be liable for any damages or losses whether direct indirect incidental special consequential or any other damages costs or expenses excepting only the cost or expense of repair or replacement of Future Design Control products as described below Future Design Controls sole responsibility under the warranty at Future Design Controls option is limited to replacement or repair free of charge or refund of purchase price within the warranty period specified This warranty does not apply to damage resulting from transportation alteration misuse or abuse Future Design Controls reserves the right to make changes without notification to purchaser to materials or processing that do not affect compliance with any applicable specifications Return Material Authorization Contact Future Design Controls for Return Material Authorization Number prior to returning any product to our facility af N T R 0 L 7524 West 98th Place Bridgeview IL 60455 Phone 888 751 5444 Fax 888 307 8014 http www futuredesigncontrols com Appendix FDC nCompa
34. ed with a USB memory stick for plug and play transfer of files to any PC running Microsoft Windows XP operating systems and via the FTP back up utility nCompass protects system access with 4 level security user rights based audit trails that document all user activity and ensures data integrity by digitally signing all data files and audit trails to meet regulatory requirements What is nCompass FDC nCompass 1 1 j FuTUREDESIC PH A T ts nCompass The nCompass controller includes the following features e One to ten loop controller models automatic program operation included e Touch screen Smart Device user interface Ul e Video recorder mode for view only applications Email SMS FTP VNC and Web functionality standard e Remote View Control using PC Tablet or Smartphone Detailed maintenance alarm monitoring and alarm history e User configurable data logging and historical data viewer 4 level security with digitally signed audit trails and data files e National time server connectivity with daylight savings e Multi lingual user interface supports over 25 languages 30 000 hour LED display 1 2 FDC nCompass What is nCompass j FUTUREDESIG nCompass oe NT L 2 Communications Wiring To avoid potential electric shock and other hazards all mounting and wiring for nCompass must conform to the National Electric Code NEC and other locally applicable codes Special expertise i
35. encoding alphanumeric characters into 7 or 8 binary bits Asynchronous Communications where characters can be transmitted at an unsynchronized point in time In other words it can start and stop anytime The time between transmitted characters may be of varying lengths Communication is controlled by start and stop bits at the beginning and end of each character Baud Unit of signaling speed derived from the number of events per second i e bits per second Baud rate The rate of information transfer in serial communications measured in bits per second Binary Number based system where only two characters exist 0 and 1 Counting is 0 1 10 11 Bit Derived from Binary digit a one or zero condition in the binary system Byte A term referring to eight associated bits of information sometimes called a character Character Letter numeral punctuation control figure or any other symbol contained in a message Typically this is encoded in one byte Communications The use of digital computer messages to link components See serial communications and baud rate Converter This device will convert from one hardware interface to another such as from EIA 232 to EIA 485 The converter may be transparent to the software which means you do not have to give any special considerations to software programming CRC When data is corrupted during transmission a method is used to return the
36. et their power from the handshake lines of the PC If you rely on this method you will need to wire these additional lines In addition your software must set these lines high A more reliable method is to use an external power supply This is especially necessary when using a laptop computer See the documentation that is provided with your converter for more information Not all converters are equal in performance If your chamber operates in a harsh electrically noisy environment this can cause less robust converters to work intermittently or not at all The following converter has been tested and is compatible with nCompass The converter is equipped with automatic send data control circuits driver control in the converter hardware so you don t have to work with software at all The circuit monitors data flow and enables the driver during transmission and automatically disables it when no data is being sent There is no need to rework software or install new drivers US Converters 405 W Fairmont Dr Tempe AZ 85282 E mail mail usconverters com www USconverters com Part XS201A RS232 to RS485 Converter Future Design Controls 7524 West 98th Place Bridgeview IL 60455 Phone 888 751 5444 Fax 888 307 8014 E mail csr futuredesigncontrols com www futuredesigncontrols com Part SNA10A Smart Network Adapter Part DB9M DB9F 6ft Cable Accessory to connect SNA10A to PC Serial Communication FDC nCompass 4 3 j FUTUR
37. given time Some interface converters on the market provide the ability to have full duplex with the EIA 485 bus This is accomplished by using two receivers and transmitters tied in tandem This type of converter will not work with the nCompass controller Be sure that the model you purchase is designed for half duplex Another consideration when selecting an interface converter is how the converter handles switching between transmit and receive Typically it is accomplished via a handshake line from the PC When data flows into the converter from the PC a handshake line is placed high When data flows out of the converter to the PC the handshake line is placed low In this way the handshake line controls the direction of information Another method of achieving this is to use a built in timer The converter switches to transmit when a character is sent to it from the PC After a period of time when the PC has not transmitted the converter switches to a receive mode It is important that you understand how your converter accomplishes this task You are reguired to wire this feature or make settings on the converter to enable this function The PC will not talk to the controller correctly without properly setting this Your converter may also reguire settings through dip switches to set up communications parameters like baud rate data bits start bits stop bits and handshaking The converter may also reguire a separate power supply Some converters g
38. he controllers parameters with just a single read command Modbus Remote Terminal Unit RTU Gould Modicon now called AEG Schneider created this protocol for process control systems called Modbus It has the advantage over other protocols of being extremely reliable in exchanging information This protocol works on the principle of packet exchanges The packet contains the address of the controller to receive the information a command field that says what is to be done with the information and several fields of data The last item sent in the packet is a field to ensure the data is received intact This is called a cyclic redundancy check sum See the following example for information on how to generate this value All information is exchanged in hex numbers nCompass only supports the binary version of Modbus referenced as RTU The ASCII version is less efficient and is not supported Therefore you must be certain to format all data in hexadecimal The CRC Cyclical Redundancy Checksum is calculated by the following steps 1 Load a 16 bit register called CRC register with OxFFFF 2 Exclusive OR the first 8 bit byte of the command message with the low order byte of the 16 bit CRC register putting the result in the CRC register 3 Shift the CRC register one bit to the right with MSB zero filling Extract and examine the LSB 4 If the LSB of the CRC register is zero repeat step 3 else Exclusive OR the CRC register with the polynomial
39. i nCompass 4 3 Creating your own Modbus Application Listed below are a few of the more common software packages that claim to support the Modbus protocol This list is provided as informational only Contact the software manufacturer for more information on applying their software LabView by National Instruments Wonderware by Wonderware SpecView by SpecView Corporation 11500 N Mopac Expwy 26561 Rancho Pkwy South 13409 53 Ave NW Austin TX 78759 3504 Lake Forest CA 92630 Gig Harbor WA 98332 Phone 800 683 8411 Phone 949 727 3200 Phone 253 853 3199 http www natinst com http www wonderware com http www specview com If you already have a software application that uses Modbus you can simply skip to the nCompass parameter table in Section 5 for the information your program reguires The rest of this section provides information on writing a software application that uses Modbus 1 You must code messages in eight bit bytes with even parity one stop bit 8 even 1 nCompass has its parity set to even as default from the factory 2 Negative parameter values must be written in twos complement format Parameters are stored in two byte registers accessed with read and write commands to a relative address 3 Messages are sent in packets that must be delimited by a pause at least as long as the time it takes to send 28 bits 3 5 characters To determine this time in seconds divide 28 by the baud rate In the case of nCompass communica
40. ic systems to interact It s a specific kind of electrical wiring configuration It has nothing to do with how data is sent over that connection The two most common interfaces used today are RS 232 which provides a simple 1 to 1 connection and RS 485 which provides a multi drop connection where more than one device can be placed on the same line The nCompass communications interface is RS 232 but can be changed to RS 485 through the use of external RS232 485 adapters EIA 232 Full Duplex An EIA 232 formerly RS 232C interface uses three wires a single transmit wire a single receive wire and a common line Only two devices can use an EIA 232 interface A 3 to 24 volt signal indicates a 1 and a 3 to 24 volt signal indicates a 0 The EIA 232 signal is referenced to the common line rather than to a separate wire as in EIA 485 Thus an EIA 232 cable is limited to a maximum of 50 feet due to noise susceptibility EIA 485 Half Duplex An EIA 485 interface uses two wires a T R a T R line A 5 volt signal is interpreted as a 1 a 5 volt signal as a0 As many as 31 slave devices can be connected to a master on a multi drop network up to 4000 feet long Wiring Most PCs have a standard EIA 232 port usually referred to as RS 232 In these instances you must use an interface converter to connect to an EIA 485 multi drop system The standards do not specify the wire size and type Use of 24 AWG twisted pair provides excellent results
41. in a manner that steps byte by byte through sending the message out the serial port formatting each piece of data prior to sending it there is a good possibility that two much time may pass between characters thus causing a failed transmission Therefore it is recommended that the entire message including the CRC be created and assembled prior to being sent to the serial port By assembling the main body of the message first you can then pass it to the CRC algorithm which can step sequentially through the message generate the CRC and append it to the message body Once the message is completely assembled it can then be sent out the serial port as a completed packet This will insure that the message reaches nCompass within the proper time frame Receiving Messages Due to the fact that Modbus RTU protocol does not have start of transmission or end of transmission characters if the serial port driver you are using does not support an interval timeout setting allowing you to automatically terminate a read after a specified time passes between bytes signaling the end of a message you must know how long the message will be that you are receiving That allows you to know how many bytes to read from your serial port and when you have received the entire message If you rely on a maximum timeout period to terminate the read depending upon the length of the received message you will either loose a portion of the message or have to set the timeout per
42. inted materials accompanying the SOFTWARE lll ADDITIONAL RIGHTS AND LIMITATIONS A Reverse Engineering De compilation and Disassembly You may not reverse engineer decompile disassemble or modify the SOFTWARE CE display software and or Control Module PLC code B No Separation of Components The SOFTWARE is licensed as a single product and the software programs comprising the SOFTWARE may not be separated for use on any hardware not supplied by Future Design Controls C Rental You may not rent or lease the SOFTWARE D Software Transfer You may NOT transfer any of your rights under this LICENSE E Termination Without prejudice to any other rights Future Design Controls may terminate this LICENSE if you fail to comply with the terms and conditions of this LICENSE In such event you must destroy all copies of the SOFTWARE and agree not to modify distribute the software or download to any hardware not purchased from Future Design Controls F The selection application and use of Future Design products and or software is the sole responsibility of the purchaser or end user No claims will be allowed for any damages or losses whether direct indirect incidental special or conseguential In addition Future Design reserves the right to make changes without notification to purchaser or user to materials or processing that do not affect compliance with any applicable specification Future Design Controls makes no warranties when using
43. iod so high that it will greatly affect the throughput of your code As can be seen from the previous examples for read and write commands in Section 4 3 1 the length of the returned message will very based on the type of command and for read commands how many registers are being returned Response messages can vary in length from as little as 5 bytes for an exception response to as many as 125 bytes for a read command Therefore in order to read in the message efficiently you need to know what type of command it is in response to The response messages are always coded with the first two bytes of the message as the controller address and command type When executing a read read in only the first 2 bytes of data at the serial port Examine the second byte and determine what the command is If it is a write command 0x06 or 0x10 you know the response message is 8 bytes long You can then read in the next 6 bytes of data from the serial port to complete the message You can then calculate the CRC for the first 6 bytes of that message and compare it to the last 2 bytes If they match then the communication completed successfully If the response is to a read command 0x03 you must then perform a single byte read from your serial port in order to get the next byte of the message The third byte in a read response message is the number of data bytes in the message By reading in this value you then know how many data bytes follow Note that this
44. j FUTUREDESICN TR 0 L 1 to 10 Loop Controller User Communications Reference Manual s MC i4 3 User Communications Reference Manual RevA Apr i 2015 M a 0 Super j FUTUREDESIC 2 AH T ts nCompass Safety Information in this Manual Notes cautions and warnings appear throughout this book to draw your attention to important operational and safety information A NOTE marks a short message to alert you to an important detail A CAUTION safety alert appears with information that is important for protecting your equipment and performance A WARNING safety alert appears with information that is important for protecting you others and equipment from damage Pay very close attention to all warnings that apply to your application A This symbol an exclamation point in a triangle precedes a general CAUTION or WARNING statement A This symbol a lightning bolt in a lightning bolt in a triangle precedes an electric shock hazard CAUTION or WARNING safety statement Technical Assistance If you encounter a problem with your Orion nCompass controller review all of your configuration information to verify that your selections are consistent with your application inputs outputs alarms limits etc If the problem persists after checking the above you can get technical assistance by dialing 1 866 342 5332 or by faxing your reguest to 1 866 332 8014 Monday thru Friday 8 00 a m to 5 00 p m Eastern S
45. k Panel USB Panel Mount Adapter IStick 4X CVR USB Panel Mount Adapter Nema4x FDC nCompass A 5 all FUTUREDESIGC T L Item 3 B42 Loop Control Board Loop 1 2 C EC Order Matrix 1 1 Power Input 4 90 250 VAC 47 63 HZ 5 11 26 VAC or VDC consult factory for availability 2 Signal Input 18 bit AID 1 Standard Input Thermocouple J K T E B R S N L C P RTD PT100 DI PT100 JIS Voltage 0 60mV 5 0 10V 0 1V 0 5V 1 5V 6 0 20 4 20mA 9 Special Order 3 Output 1 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma 4 20mA 0 20mA Isolated 1 5V 0 5V 0 10V Isolated Triac output 1A 240VAC SSR SSR Driver 14 VDC 40 Ma Output 2 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma 4 20mA 0 20mA Isolated 1 5V 0 5V 0 10V Isolated Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12 VDC 40 ma Isolated Transmitter power supply 5 VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma Output 3 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma Triac output 1A 240VAC SSR Transmitter power supply 20 VDC 25 ma Isolated Transmitter power supply 12VDC 40 ma Isolated Transmitter power supply 5VDC 80 ma Isolated SSR Driver 14 VDC 40 Ma 6 Output 4 None Relay rated 2A 240VAC SPST SSR Driver 5 VDC 30 Ma Retransmission 4 20 0 20mA isolated Retransmission 1 5 0 5 0 10VD
46. lave A device that only responds to commands This device never starts communication on i s own Only the Master can do this See Master SCADA Supervisory Control and Data Acguisition Serial To process something in order First item second item etc Serial Communications A method of transmitting information between devices by sending all bits serially see serial over a single communication channel Software Information of data or program stored in an easily changeable format RAM Floppy Disk Hard Disk Space Represents the transmission of a data bit logic 0 see logic leve Usually this is the most positive voltage value in serial communications Start Bit A binary bit or logic level that represents when the serial data information is about to start at the beginning of a character or byte This voltage level is positive Stop Bit A binary bit or logic level that represents when the serial data information is complete at the end of a character or byte This voltage level is negative Synchronous When data is transmitted on a data line and a clock signal is used on another line to determine when to check the data line for a logic level This clock is said to synchronize the data Transmit To send data from one device to another The device that sends the data is the transmitter Word Two bytes make a word This contains 16 bits A word can represent a decimal value of 0 to 65535
47. nd or digital inputs File Interval Once started a data log file is configurable to auto end and start new file with the same name as previous file with an appended time date name Configurable time interval is from 1 to 31 days File name Operator entered file name batch 8 lot number or if running a profile file name same as profile name all file names appended with date time to file name Operator Comments Events Unlimited operator comments events linked to each file entered manually or via Bar Code Scanner Digital Signatures full support for user based digital signatures for each data file data encryption Historical Data File View 8 print the data directly from the display auto scale on X 8 Y axis with each channel selectable for right or left axis values from a PC after data is copied moved via LAN FTP or email or USB Flash Memory card provided NOTES B42 Control Board 1 to 10 may be used B42 Loop Control http www futuredesigncontrols com B42 HTM Analog Input 200ms scan rate with 18 bit A D resolution providing high accuracy and PID control performance Outputs Maximum of 4 control or auxiliary outputs PID Control Outputs up to 2 with Auto Tune capability heat cool Relay SSR driver 5V SSR driver 14V 1A SSR mA or VDC Alarm or Event up to 3 outputs outputs 2 3 amp 4 Relay SSR driver 5V SSR driver 14V or 1A SSR Auxiliary Outputs up to 2 outputs one or two Transmitter power
48. nnn nnnn controller address 1 byte write command 0x10 starting register high byte starting register low byte number of registers to write high byte number of registers to write low byte CRC low byte CRC high byte Serial Communication FDC nCompass 4 9 j FUTUREDESIC ts nCompass Exception Responses When nCompass cannot process a command it returns an exception response and sets the high bit 0x80 of the command 0x01 illegal command 0x02 illegal data address 0x03 illegal data value Packet returned from nCompass nn nn nn nn nn controller address 1 byte command 0x80 exception code 0x01 or 0x02 or 0x03 CRC low byte CRC high byte 4 3 2 Error Checking In Modbus communications every message sent from the master your software receives a response from the slave nCompass including write commands Thus after each command sent you must read the controller response before sending the next message This provides the method of error checking in order to verify that the message you sent was received correctly and that the controller is operating accordingly This allows you to then determine the appropriate recovery response in case the message was not received correctly by the controller and what action is to be taken by an operator and or the software itself The exception responses provide a basic form of error checking When an exception response is receive
49. nnnn 00nn nnnn controller address 1 byte read command 0x03 starting register high byte starting register low byte number of registers high byte 0x00 number of registers low byte CRC low byte CRC high byte Packet returned from nCompass nn 03 nn nn nn nn nn nn nn controller address 1 byte o read command 0x03 number of data bytes 1 byte first register data low byte first register data high byte register n data high byte register n data low byte CRC low byte CRC high byte Serial Communication FDC nCompass 4 7 j FUTUREDESIC ts nCompass Example Read registers 35 and 36 loop 1 process variable and setpoint of controller at address 1 configured for 1 decimal point Sent 01 03 00 23 00 02 35 C1 Received 01 03 04 03 OD 01 F3 2A 61 Message data 781 0x030D process variable of 78 1 499 0x01F3 setpoint of 49 9 Write Register Command 0x06 This command writes a value to a single register This command is to be used for setting control values in nCompass To set multiple values repeat the command for each data location Packet sent to nCompass nn 06 nnnn nnnn nnnn controller address 1 byte write command 0x06 register high byte register low byte data high byte data low byte CRC low byte CRC high byte Packet returned from nCompass nn 06 nnnn nnnn nnnn
50. on in EnVision each loop controller of the nCompass MC can be configured in EnVision as individual P Series controls This allows each one to be independently monitored and controlled over the nCompass interface nCompass MC Loop Controller Data Registers FDC nCompass 5 5 j FUTUREDESIC ts nCompass 5 2 Automatic Program Registers The automatic program parameters are a separate group of registers that are used to download programs to each individual loop controller attached to nCompass The manner in which the program steps are configured and sent to nCompass is specific and must be followed exactly Each program consists of a header step of 5 registers and up to 64 steps consisting of 10 data registers The program must be written one step at a time using a multiple write command 0x10 to write all the data for each step at once This allows programs to be stored as two dimensional arrays of which code can be written to simply index through the array step by step and transmit the program file to nCompass The first 5 registers of the program header step contain specific settings related to the program These include the program number hold back band ramp units and dwell units Regist Data Range F pieva Parameter Description D E Type Low High Unit 86 0x0056 Program Selected for View W 9 9 87 0x0057 Hold Back Band W je 88 0x0058 89 0x0059 Ramp Units W 90 0x005A Dwell Units W
51. onse Messages with the wrong CRC or timing will receive no response It is the user s responsibility to handle the error appropriately within their own software and determine whether to resend the message or halt for operator intervention User Responsibility Refrain from reading or writing from to a register that does not exist or is currently disabled Writing values to unassigned registers could cause system instability malfunction or failure Care must also be taken in that the process can not cause damage to property or injury to personnel if the wrong commands are sent due to operator error or eguipment malfunction 4 6 FDC nCompass Serial Communication j FUTUREDESIG nCompass oe NT L 4 3 1 Packet Syntax Each message packet begins with a one byte controller address from 0x01 to 0x1F The second byte in the message packet identifies the message command read 0x03 write single 0x06 or write multiple 0x10 The next n bytes of the message packet contain register addresses and or data The last two bytes in the message packet contain a two byte Cyclical Redundancy Checksum CRC for error detection Packet format nn nn nn nn nn nn address i command registers and or data CRC Read Register s Command 0x03 This command returns from 1 to 60 registers This command is used for reading one or more data locations from nCompass Packet sent to nCompass nn 03
52. ower supply should be used to power nCompass components only and not OEM or other end user components or devices P O Box 1196 888 751 5444 Sales Bridgeview IL 60455 888 307 8014 Fax Technical Support 866 342 5332 http www futuredesigncontrols com CD GE C RoHS Compliant FDC nCompass A7 j FUTUREDESIG BH T ts nCompass FUTURE DESIGN SOFTWARE LICENSE FOR FDC Orion nCompass Control System Future Design Controls Windows CE based nCompass display and Control Module Idec PLC software listed as SOFTWARE in this document is protected by copyright laws and international copyright treaties as well as other intellectual property laws and treaties The SOFTWARE is licensed at no charge to the end user when all components including but not limited to the Control Module Idec PLC components and CE Color Touch Screen display are purchased from Future Design Controls All ownership and rights remain with Future Design Controls I LICENSE GRANT This LICENSE grants you the following rights A You may use Future Design s SOFTWARE with Future Design Controls products or products marketed by Future Design Controls only Products are considered Future Design Controls products and products marketed by Future Design Controls when the sale or shipment originates from our main headquarters in Bridgeview IL or one of our authorized office locations Products purchased from Future Design Controls distributors or OE
53. r each loop controller attached to nCompass In order to read the process value of each loop for example you must send separate read commands addressed specifically to each controller The loop controls are addressed in sequential order starting with the Modbus address entered on the communications settings screen on nCompass If the Modbus address is set to 3 and there are 5 loop controls attached to nCompass the loop control addresses would be 3 4 5 6 and 7 Sending the read register command to nCompass to read register 128 with an address of 5 would result in nCompass returning the process value of loop number 3 The third loop of nCompass based on the example responds to the Modbus address of 5 For an nCompass system of 1 to 10 loops simply changing the address of the command allows you to send or receive the same data from the next loop controller Utilizing a read register command starting at register 127 and reading a total of 13 registers allows you to retrieve the current operating status of the loop control in a single command By repeating the command for each loop attached to nCompass your software can continually monitor the status of all loops attached to nCompass quickly and efficiently The design of the serial interface also allows the nCompass MC to connect to FDC S Envision software The software is free of charge and provides a host of features and is compatible with all FDC products Using the P Series controller selecti
54. rder Matrix Fixed characters SD MC SD card with MC 1 to 10 Loop Control Display Configuration and SD plugged into display Control System Options ordered separately as appropriate Cable Display to B42 Control Board CA2011 8D Cable 10ft from Display to B42 controller Note Consult factory for other lengths amp options Display Power Supply input 100 240VAC Output 24VDC DIN Rail Mount PS5R SB24 15W power supply 0 6A Open Frame PS3X B24AFC 15W power supply 0 6A Note Either of the above will power the FDC 0450 touch screen display USB Memory Stick UDF115 2GB 2GB High Capacity USB Memory Stick 3VDC System Reset Timer GE1A C10MA110 SR2P 06 Reset Timer and socket DIN Rail Note Timer is recommended for proper system restart due to momentary power interruptions lt 500ms which can erroneous operation APPENDIX B42 Programming Display Board B42 Display Board 300 mm cable 3020B42 00300A 00 300 B42 Display Board 1000mm cable 3020B42 00300A 00 1K Printed Operators Manual Part Number Orion nCompass MC i4 3 User Manual pdf FDC Orion nCompass MC i4 3 User Manual Printed Configuration Manual Part Number Orion nCompass MC i4 3 Config Manual pdf FDC Orion nCompass MC i4 3 Configuration Manual Printed Communication Reference Manual Part Number Orion nCompass MC i4 3 Comm Reference pdf FDC Orion nCompass MC i4 3 Communication Reference Manual USB Cables 8 Accessories IStic
55. rm outputs nCompass can be operated in single set point or automatic program control mode Program entry is made easy through the use of copy paste and delete menu selections Programs can be copied to the external USB memory stick and then imported to another nCompass controller which eliminates the need to enter duplicate programs into multiple systems Data file analysis tools make looking at historical data a simple task Any control variable saved to the data file can be plotted on the historical data chart for any time frame within the data file s total time range The built in Ethernet functionality includes a Web Server to provide access to all nCompass data view only a VNC interface for remote control and monitoring and an NTS clock all available via a local Intranet connection wired or wireless or the World Wide Web using standard software like Microsoft s Internet Explorer nCompass provides a rich set of tools for control interaction and process monitoring Views include single and all loop views charts alarm automated program status as well as historical data alarm log and audit trail views The menu driven interface eliminates screen clutter by providing an easy to use Smart Device interface for interaction between the user and nCompass nCompass can store more than one year of data on its SD memory card Data logging can be enabled manually or automatically during program operation Data backup is provid
56. rogram 9 only in each loop control for automatic ramp soak program operation The whole number of the value 9 designates program 9 The fractional portion of the value 00 63 designates the segment number of the program which corresponds to steps 1 to 64 Range Low 9 00 Range High 9 63 Example Values read from and written to nCompass are integer values no decimal so the decimal point is implied The values read from and written to nCompass will be in the range of 900 to 963 To set the program step number to 3 you would write a value of 902 to nCompass 902 900 for program number 2 step number of 3 minus 1 to convert step number to segment number B2 Pal ameieh Description Value p 0 Centigrade 1 Fahrenheit 2 Process Units linear input type only B3 Note Auto tune may not be available depending upon the loop Parameter ar A Valie Description configuration If auto tune operation is not available the loop controller will revert back to static mode When auto tune operation completes 0 Program Run normally the loop controller will revert back to static mode 1 Program Hold Only one mode can be set at time The program hold mode can not be 2 Static Mode set unless a program is currently running The program mode can then be switched between run and hold by setting a value of 0 or 1 to the 3 Automatic Tune operation mode register 5 Manual Mod
57. rogram and Segment Running R Bi 2 z 135 0x0087 Total Number of Steps R 1 64 136 0x0088 Total Time for Step Running R 0 99 59 137 0x0089 Set Point for Current Step R 32768 32767 ie 138 0x008A Time Remaining in Current Step R 0 99 59 s 9999 139 0x008B Cycles Remaining for Current Loop R 1 10000 nfinite 142 0x008E Command Code W k Notes zA RW Specifies readable writable data R specifies read only data and W specifies a write only control value B The range of certain parameters are dependent upon system options Consult the following range tables for information regarding the use of these parameters Reading bit oriented parameters The value contained in these parameters is dependant upon the combination of on bits 1 Therefore only the individual status of each bit has meaning not the value of the parameter 5 2 FDC nCompass nCompass MC Loop Controller Data Registers j FUTUREDESIG nCompass oe NT L Setting bit oriented parameters The value that must be written to these parameters is dependant upon the combination of on bits Therefore it is necessary to know the current value of the parameter before setting it so that only the bit status you want to update is changed Otherwise sending a value derived from only the bit you wish to set will turn off all other functions related to the other bits in the parameter B1 Parameter Value Note nCompass uses p
58. rogram with a temperature setpoint of 80 will result in a control temperature of 80 F if the nCompass control is in degrees Fahrenheit However if the nCompass control is set for degrees Centigrade it will result in a control temperature of 80 C 176 F 5 2 1 Starting an Automatic Program on nCompass Automatic programs are sent to nCompass in a step by step process The download seguence must be followed in proper order and must complete without errors to be valid If a write error is detected during the transfer of a program from a PC to nCompass no response from nCompass or NACK returned the program download must be aborted and restarted nCompass is automatically placed into program transfer mode when the header step of a program is first sent registers 86 90 nCompass then begins looking for the following program steps to be sent Once nCompass sees the end step it then downloads the program to the loop controller assigned to the Modbus address that the program steps were written to If an error occurs during the transfer process from the PC to nCompass the program transfer process should be stopped at the PC The data sent to nCompass was either corrupted in transmission or not received properly It is not possible to resend the failed step because it is not known if any of the previous data was received by nCompass properly On the transmission error nCompass will enter a 15 second timeout process At the end of the timeout period
59. s required to install wire configure and operate the nCompass controller Personnel without such expertise should not install wire or operate nCompass Prevent metal fragments and pieces of wire from dropping inside the housing of any nCompass component If necessary place a cover over the component during installation and wiring Ingress of such fragments and chips may cause a fire hazard damage or malfunction of the device Locate the nCompass touch screen and all related control components away from AC power motor wiring and sources of direct heat output such as transformers heaters or large capacity resistors The nCompass touch screen provides an RS232C COM1 user communications port for connecting nCompass to a PC running software such as FDC s Envision In order to connect nCompass to a PC a cable must be made according to the diagram below Im o D sub 9 pin Female Connector Pinouts D sub 9 pin Female Connector Pinouts Description Fin Pin Dee Ro nevea 2 fet a 0 Re no Transmitoata FL gt 00 rant ata 56 SignalGround 5 f V VA 5 se Signal Ground NOTE DO NOT use a standard null modem cable to connect nCompass to a PC Most computers do not provide a standard serial port and a USB to serial converter must be used Incompatibilities may exist between nCompass and certain USB to serial adapters which will cause nCompass to malfunction when connected using a standard null modem cable
60. ser Interface GUI touch screen provides a full SCADA feature set providing ease of use with either an icon menu system with finger navigation or traditional Menu bar data acguisition alarm manager operator audit trail multi level security with user rights LAN connections and more The GUI provides ease of configuration use 8 support System Configuration for loop alarm input amp outputs assignment Help language selection and more all without an external device or PC Loop Views view 1 to 10 controls in single or overall view as well as in a Trend format trend up to loop controls PV SP 8 Percent Out Profile Virtually unlimited number of profiles with each profile having up to 64 steps with up to 3 events File Management View print copy move Profile Alarm Historical Data data log files and operator audit trial files File transfer via LAN features or USB flash memory LAN Remote Access amp touch screen operation VNC email SMS on alarm email historical alarm amp audit trail files on demand Web Page view only and FTP of alarm audit and historical data files automatically or on demand Data Acguisition Data log PV SP and PID Percent output for 1 to10 loop controls Log interval configurable 6 seconds to 31 minutes with configurable number of days to auto start 8 name next file 1 to 31 days File Start Stop Configurable operator on demand on system boot profile ramp soak start e
61. ss A 9
62. supplies and or one Retransmission output Note Analog mA and VDC PID and retransmit outputs are 15 bit contributing to high performance PID control and highly accurate retransmitted PV or SP values Alarm Types Process Deviation and Deviation Band all High or Low PID Parameters Two sets of PID values may be configured and selected by Profile Step and or by digital event input see next Event Inputs Configurable for one of the following functions Profile Run momentary Profile Hold closed profile hold open profile run Profile Run Hold closed profile run open profile hold Profile Abort momentary Segment Advance momentary Manual Mode closed manual mode open normal control Failure Transfer closed failure transfer open normal control transfer active Out is a pre configured value for each output Appendix all FUTUREDESIGC A T L NOTES Profile Ramp Soak Specifications Profile Ramp Soak Profiles Virtually an unlimited number of profiles in system memory Profile Type System configurable for separate profiles per loop or common profile with slave set point operation for other loops Profile Start via touch screen or via Event input see above Profile Name Free form 16 character max naming convention with auto append time date stamp Global Profile Configuration Profile Time Base Time Ramp hh mm or mm ss Ramp Rate degrees minute or hour Starting and Ending
63. tandard Time You can also email your request to support futuredesigncontrols com An applications engineer will discuss your application with you Please have the following information available e Complete Model s and or Serial s for Component s in Question e Complete Software Version s All Configuration Information All User Manuals Warranty and return information is on the back cover of this manual Your Comments Your comments or suggestions on this manual are welcome Please send them to Future Design Controls P O Box 1196 Bridgeview Illinois 60455 Telephone 1 888 751 5444 fax 1 888 307 8014 csr futuredesigncontrols com The Orion nCompass MC i4 3 User Communications Reference Manual is copyrighted by Future Design Controls Inc 2015 all rights reserved http www futuredesigncontrols com nCompass htm FDC nCompass Preface nCompass at SEBA 1 What is nCompass czasakasslace os SKa bossa saka nu oa k seS SH Na as e KaK nn s Ha aal a a SKA RAK aa SSR OHA KSS 1 1 ME FOAM OS caer wetasied caste ds tecencduadandsnpnwes AE upacessecsadg lee seateeaccanda len sitaceeadeaaddadenuumsssndasgettencnesedess Saamaanesamdeaass 1 1 2 Communications Wiring sse iza icskica ics aka inohra liali nou ana dor ba 2 1 3 Communication BASICS sss 2000 szlo os ak odklad cece aaa na 3 1 3 1 Explanation Of MMS xi sisexs daria Vallo rana hh rain 3 1 4 Serial Communicator a HP OKO KO AKA OR AKASA RAK a 4 1
64. the buffer will be cleared and the program can be resent In order to insure that the new download begins properly induce a 20 second wait period on the host PC after the failed transmission attempt to insure that enough time has elapsed 58 FDC nCompass nCompass MC Loop Controller Data Registers j FUTUREDESIG nCompass oe NT L Starting a Program 20 second pause nCompass clears program buffer Send program to nCompass one step at a time with a minimum 1 second pause between write commands Is the program already loaded Send program header 86 thru 90 NO 1 second pause Send step 1 data 91 thru 100 1 second pause Send step 2 data 91 thru 100 1 second pause Send last step data Write error during program download Set program start 1 second pause step 1 900 962 nCompass begins program download Set program to run 11 0 Wait for nCompass to transfer program to loop control nCompass MC Loop Controller Data Registers FDC nCompass 5 9 j FUTUREDESICN nCompass Appendix APPENDIX FDC nCompass A 1 j FUTUREDESIC ts nCompass Terms and Definitions address A unique designator for a location of data or a controller that allows each location or controller on a single communications bus to respond to its own message ASCII pronounced AS KEY American Standard Code for Information Interchange A universal standard for
65. tions at 9600 baud this calculates to a minimum period of 3ms In addition the nCompass timeout period must be added to that in order to properly time the send and receive messages between the host computer and multiple nCompass controllers on the serial link With a default timeout period in nCompass of 135ms it makes a total pause of 138ms minimum Thus after you receive a response from an nCompass controller at your PC you must wait a minimum of 138ms before sending the next command 4 Values containing decimal points such as process values and set points have the decimal point implied i e the data exchange can only be performed using whole numbers Thus the value must be scaled appropriately in order to exchange the data correctly For example a setpoint of 78 4 degrees must be sent as a value of 784 in order for nCompass to be set correctly Likewise a process value read from nCompass with a value of 827 is actually 82 7 degrees Consult the parameter table for the proper format and allowable range of each value 5 When monitoring a process try to keep the number of read and write commands to a minimum of 500ms between exchanges to a single controller Continuously reading data at a faster rate consumes an excess amount of the controller s processor time and does not provided any additional benefits in process monitoring Handling Communication Errors Messages with the wrong format or illegal values will receive an exception resp
66. unications to work properly Parity Bit Besides the synchronization provided by the use of start and stop bits an additional bit called a parity bit may optionally be transmitted along with the data A parity bit affords a small amount of error checking to help detect data corruption that might occur during transmission There are several defined parity selections available for serial communications They are even parity odd parity mark parity space parity or none at all can be used When even or odd parity is being used the number of marks logical 1 bits in each data byte are counted and a single bit is transmitted following the data bits to indicate whether the number of 1 bits just sent is even or odd Mark parity means that the parity bit is always set to the mark signal condition and likewise space parity always sends the parity bit in the space signal condition Since these two parity options serve no useful purpose whatsoever they are almost never used nCompass offers parity settings of Even Odd and None In order for a device to communicate with nCompass it must have its serial port set to use the same parity setting as nCompass in order for data communications to work properly nCompass is provided with a default parity setting of Even in order to be compatible with FDC s Envision software Serial Communication FDC nCompass 4 1 j FUTUREDESIC ts nCompass 4 1 Interface Standards An interface is a means for electron

Orion nCompass MC i4.3 - Future Design Controls

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