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RKC INSTRUMENT LE110 Instruction Manual

Differential pressure type back pressure type indicator
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Back Pressure Type Indicator
[Differential Pressure Type]
LE110
Communication
Instruction Manual
IMR01C06-E3
RKC INSTRUMENT INC.
®

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Summary of Contents for RKC INSTRUMENT LE110

  • Page 1 Back Pressure Type Indicator [Differential Pressure Type] LE110 Communication Instruction Manual IMR01C06-E3 RKC INSTRUMENT INC. ®...
  • Page 2 Microsoft, Windows and Windows NT are registered trademarks of Microsoft Corporation in the USA and other countries. Company names and product names used in this manual are the trademarks or registered trademarks of the respective companies. All Rights Reserved, Copyright  2004, RKC INSTRUMENT INC.
  • Page 3 Thank you for purchasing this RKC instrument. In order to achieve maximum performance and ensure proper operation of your new instrument, carefully read all the instructions in this manual. Please place this manual in a convenient location for easy reference.
  • Page 4 CAUTION This is a Class A instrument. In a domestic environment, this instrument may cause radio interference, in which case the user may be required to take adequate measures. This instrument is protected from electric shock by reinforced insulation. Provide reinforced insulation between the wire for the input signal and the wires for instrument power supply, source of power and loads.

  • Page 5: Table Of Contents

    CONTENTS Page 1.OUTLINE................1 2. SPECIFICATIONS ..............2 3. WIRING ................. 3 4. SETTING ................5 4.1 Transfer to Communication Parameter Group..........6 4.2 Setting the Communication Parameters ............7 4.3 Communication Requirements ..............11 5. PROTOCOL ................ 13 5.1 Polling......................13 5.1.1 Polling procedures ..................... 14 5.1.2 Polling procedure example.................
  • Page 6 MEMO IMR01C06-E3...

  • Page 7: Outline

    1. OUTLINE This manual describes the communication functions between the back pressure type indicator LE110 and the host computer. The back pressure type indicator LE110 interfaces with the host computer via RKC communication protocol. Host computer LE110 RS-485 LE110 Host computer...

  • Page 8: Specifications

    2. SPECIFICATIONS Interface: Based on RS-485, EIA standard Connection method: 2-wire system, half-duplex multi-drop connection Communication distance: 1 km max. The maximum communication distance will be affected by the surrounding conditions. Synchronous method: Start/stop synchronous type Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps Data bit configuration: Start bit: 1 Data bit: 7 or 8...

  • Page 9: Wiring

    Send data/Receive data T/R (A) Send data/Receive data T/R (B) Signal ground Wiring method Connection to the RS-485 port of the host computer Paired wire LE110 Host computer T/R (A) T/R (A) T/R (B) T/R (B) Shielded twisted pair wire...
  • Page 10 When the host computer (OS: Windows 98SE/2000/XP) is corresponding to the USB connector, our communication converter COM-K (sold separately) can be used. The cable is provided by the customer. Connection with up to 31 LE110 and one host computer Host computer Host computer...

  • Page 11: Setting

    4. SETTING To establish communication parameters between host computer and LE110, it is necessary to set the device address, communication speed, data bit configuration and interval time on each LE110 in the communication parameter group. Power ON Unit Display (Display for approx. 3 seconds)

  • Page 12: Transfer To Communication Parameter Group

    4. SETTING 4.1 Transfer to Communication Parameter Group 1. To go to the environment setting mode, you must be in PV display. Press and hold the DOWN key and press the SET key at the same time to initiate environment setting mode. The first parameter to be displayed will be the PG01.

  • Page 13: Setting The Communication Parameters

    4. SETTING 4.2 Setting the Communication Parameters To select parameters in communication parameter group, press the SET key. The parameters are displayed and sequenced in the order of device address, Add, communication speed, bPS, data bit configuration, bIT and interval time set value, InT. Setting procedure Parameter group 10 [PG10] Press the SET key.
  • Page 14 Even * The interval time for the LE110 should be set to provide a time for host computer to finish sending all data including stop bit and to switch the line to receive data. If the interval time between the two is too short, the LE110 may send data before the host computer is ready to receive it.
  • Page 15 4. SETTING Setting procedure example 1. Go to the communication parameter group PG10 so that device address, Add, is displayed. Present set value is displayed, and the least significant digit brightly lit. Device address 2. Set the device address. Press the UP key to enter 5 at the least significant digit. Example: Setting the device address to 15.
  • Page 16 4. SETTING 5. Press the SET key to set the value thus set. The display changes to the next communication parameter. It the SET key is not pressed within 1 minute, the present display returns to the PV display and the value set here returns to that before the setting is changed. Communication speed 6.

  • Page 17: Communication Requirements

    Whether the host computer is using either the polling or selecting procedure for communication, the following processing times are required for LE110 to send data: -Response wait time after LE110 sends BCC in polling procedure -Response wait time after LE110 sends ACK or NAK in selecting procedure Polling procedure Time (ms)
  • Page 18 Response send time after LE110 receives BCC + Interval time b: Response wait time after LE110 sends ACK or Response wait time after LE110 sends NAK To switch the host computer from transmission to reception, send data must be on line. To check if data is on line, do not use the host computer’s transmission buffer but confirm it by...

  • Page 19: Protocol

    5. PROTOCOL LE110 uses the polling/selecting method to establish a data link. The basic procedure is followed ANSI X3.28 subcategory 2.5, A4 basic mode data transmission control procedure (Fast selecting is the selecting method used in LE110). The polling/selecting procedures are a centralized control method where the host computer controls the entire process.

  • Page 20: Polling Procedures

    Identifier address 1. Device address (2 digits) The device address specifies the LE110 to be polled and each LE110 must have its own unique device address. For details, see 4.2 Setting the Communication Parameters (P. 7). 2. Identifier (2 digits) The identifier specifies the type of data that is requested from the LE110.
  • Page 21 • When all the data has been sent (5) No response from the LE110 The LE110 will not respond if the polling address is not received correctly. It may be necessary for the host computer to take corrective action such as a time-out.
  • Page 22 An acknowledgment ACK is sent by the host computer when data received is correct. When the LE110 receives ACK from the host computer, the LE110 will send any remaining data of the next identifier without additional action from the host computer.

  • Page 23: Polling Procedure Example

    Normal transmission Host computer send Host computer send Host computer send Polling Identifier address Next send data Data Identifier LE110 send Send data LE110 send Error transmission Host computer send Host computer send Host computer send Error data Polling Identifier...

  • Page 24: Selecting

    Host computer sends selecting address for the selecting sequence. Device address (2 digits) The device address specifies the LE110 to be selected and each LE110 must have its own unique device address. For details, see 4.2 Setting the Communication Parameters (P. 7).
  • Page 25 For the STX, ETX and BCC, see 5.1 Polling (P. 13). 1. Identifier (2 digits) The identifier specifies the type of data that is requested from the LE110, such as set value. For details, see 5.3 Communication Identifier List (P. 22).
  • Page 26 An acknowledgment ACK is sent by the LE110 when data received is correct. When the host computer receives ACK from the LE110, the host computer will send any remaining data. If there is no more data to be sent to LE110, the host computer sends EOT to terminate the data link. (5) Negative acknowledge NAK If the LE110 does not receive correct data from the host computer, it sends a negative acknowledgment NAK to the host computer.

  • Page 27: Selecting Procedure Example

    Normal transmission Host computer send Host computer send Host computer send Data Selecting Next send data Identifier address Send data LE110 send LE110 send Error transmission Error data Host computer send Host computer send Host computer send …… Selecting Data...

  • Page 28: Communication Identifier List

    5. PROTOCOL 5.3 Communication Identifier List Communication is not possible when an identifier is specified that the LE110 can not recognize. The number of digits for data is 6. (Attribute RO: Read only, WO: Write only, R/W: Read and Write)
  • Page 29 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value  Output 8 status 0: OFF 1: ON This is the identifier effective when output 8 points specification and any output type other than OFF are selected.
  • Page 30 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value  Specific gravity monitor 0.800 to 2.500  Scale low monitor Scale low to Scale high ...
  • Page 31 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value Output 6 set value Scale low to Scale high Input range high This is the identifier effective when outputs type other than OFF are selected.
  • Page 32 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value  Default setting 1: Executed  Error release 0: Executed Decimal point position 0: No decimal place selection 1: One decimal place 2: Two decimal places...
  • Page 33 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value Linearizing table setting 7 Linearizing table setting 6 to 25.2 Scale high This is the identifier effective when the engineering unit is set to l or ml.
  • Page 34 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value 0: Transistor turned on in the output Output 1 action selection activating state 1: Transistor turned off in the output activating state Output 1 differential gap 0.0 to 10.0 % of span...
  • Page 35 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value −50 to +50 mm Output 3 deviation value setting This is the identifier effective when output type 3 (high limit deviation output) or 4 (low limit deviation output) is selected.
  • Page 36 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value 0: OFF Output 5 type selection 1: Process high output 2: Process low output 3: Deviation high output 4: Deviation low output The high limit or low limit deviation...
  • Page 37 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value 0: Transistor turned on in the output Output 6 action selection activating state 1: Transistor turned off in the output activating state Output 6 differential gap 0.0 to 10.0 % of span...
  • Page 38 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value Output 7 differential gap 0.0 to 10.0 % of span This is the identifier effective when output 8 points specification is selected.
  • Page 39 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value 0: Transistor turned on in the output Output 8 action selection activating state 1: Transistor turned off in the output activating state This is the identifier effective when output 8 points specification is...
  • Page 40 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value Specific gravity setting 0.800 to 2.500 1.000 This is the identifier effective when the specific gravity setting is changed to the manual setting.
  • Page 41 5. PROTOCOL Continued from the previous page. (Attribute RO: Read only, WO: Write only, R/W: Read and Write) Name Iden- Description Factory Attrib- tifier set value Specific gravity correction 0: Without specific gravity correction function selection function 1: With specific gravity correction function This is the identifier effective when the engineering unit is set to mm and the...

  • Page 42: Troubleshooting

    6. TROUBLESHOOTING WARNING To prevent electric shock or instrument failure, always turn off the system power before replacing the instrument. To prevent electric shock or instrument failure, always turn off the power before mounting or removing the instrument. To prevent electric shock or instrument failure, do not turn on the power until all the wiring is completed.
  • Page 43 6. TROUBLESHOOTING Continued from the previous page. Problem Probable cause Solution No response Error in the data format Reexamine the communication program Transmission line is not set to the receive state after data send (for RS-485) EOT return The specified identifier is invalid Confirm the identifier is correct or that with the correct function is specified.

  • Page 44: Ascii 7-Bit Code Table

    7. ASCII 7-BIT CODE TABLE b5 to b7 b4 b3 b2 b1 ‘ ” & ’ < ¥ > ˜ IMR01C06-E3...
  • Page 45 The first edition: JUN. 2004 [IMQ00] The third edition: OCT. 2005 [IMQ00]...
  • Page 46 RKC INSTRUMENT INC. HEADQUARTERS: 16-6, KUGAHARA 5-CHOME, OHTA-KU TOKYO 146-8515 JAPAN PHONE: 03-3751-9799 (+81 3 3751 9799) E-mail: info@rkcinst.co.jp FAX: 03-3751-8585 (+81 3 3751 8585) IMR01C06-E3 OCT. 2005...

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