ICP DAS USA ICP CON GW-7557 User Manual
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ICP DAS USA ICP CON GW-7557 User Manual

Profibus/hart gateway
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GW-7557 PROFIBUS/HART Gateway
User's Manual
High Quality, Industrial Data Acquisition, and Control Products
GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011)
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Summary of Contents for ICP DAS USA ICP CON GW-7557

  • Page 1 GW-7557 PROFIBUS/HART Gateway User's Manual High Quality, Industrial Data Acquisition, and Control Products GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 1...
  • Page 2 Warranty All products manufactured by ICP DAS are under warranty regarding defective materials for a period of one year from the date of delivery to the original purchaser. Warning ICP DAS assumes no liability for damages resulting from the use of this product.

  • Page 3: Table Of Contents

    Table of Contents 1. Introduction 1.1 Features 1.2 Specification 2. Hardware 2.1 Block Diagram of GW-7557 2.2 Pin Assignment 2.3 Wiring 2.4 Setting the PROFIBUS Address 2.5 LED status indicator 2.6 Normal/Setting DIP switch 2.7 Jumper 3.1 PROFIBUS data exchange 3.2 HART data exchange 3.3 Communication protocol transfer 4.

  • Page 4: Introduction

    1. Introduction PROFIBUS and HART are two kinds of famous protocols and are wildly used in the fields of factory and process automation. The GW-7557 is a PROFIBUS to HART gateway. By using this module, users can easily put the HART slave devices into PROFIBUS network.

  • Page 5: Features

    1.1 Features 16-bit Microprocessor inside with 80MHz ● Profichip VPC3+C PROFIBUS controller ● Support PROFIBUS DP-V0 slave ● PROFIBUS transmission rate detect automatically ● Max transmission speed up to 12 Mbps for PROFIBUS and 115.2 kbps for ● COM Port COM Port driver has 1K bytes QUEUE input buffer &...
  • Page 6 Allow two HART masters ● Power requirement: Unregulated +10 ~ +30 V ● Power reverse protection, Over-Voltage brown-out protection ● Power consumption 2.0W ● Module specs: Dimensions: 119mm x 72mm x 33mm ● Operating temperature: -25 ~ 75 ºC ● Storage temperature: -30 ~ 85 ºC ●...

  • Page 7: Hardware

    2. Hardware 2.1 Block Diagram of GW-7557 Figure 2 Block diagram of GW-7557 2.2 Pin Assignment Figure 3 Pin assignment of GW-7557 GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 7...
  • Page 8 Table 2 14-pin screw terminal block Name Description HART 0+ Positive of HART channel 0 HART 0- Negative of HART channel 0 HART 1+ Positive of HART channel 1 HART 1- Negative of HART channel 1 HART 2+ Positive of HART channel 2 HART 2- Negative of HART channel 2 HART 3+...

  • Page 9: Wiring

    2.3 Wiring GW-7557 supports PROFIBUS to HART communication. The following section describes the connection interface of GW-7557. 2.3.1 RS-232 connection The RS-232 port of the GW-7557 has got three pins. The wiring of the RS-232 device with the RS-232 port of the GW-7557 is shown in Figure 4. GW-7557 RS-232 device RS-232 port...
  • Page 10 Table 4 Transmission rate decreasing with increasing transmission distance Transmission Rate(kbps) Transmission Distance per Segment (meter) 9.6, 19.2, 45.45,93.75 1200 187.5 1000 1500 3000, 6000, 12000 In order to minimize the reflection effect of signal transmission, both ends (first node and last node) of a PROFIBUS segment needs to be equipped with an active terminal resistor as shown in Figure 5.
  • Page 11 Terminator ON Terminator OFF Terminator Switch Figure 6 PROFIBUS connector The number of stations in a PROFIBUS network is restricted to 126. According to the PROFIBUS specification up to 32 stations are allowed per segment. A repeater has to be used to link the bus segments. 2.3.3 HART connection The HART connection is divided into two types: “Loop Power Source”...
  • Page 12 Figure 8 Loop Power Source (2) Figure 9 Loop Power Source (3) GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 12...

  • Page 13: Setting The Profibus Address

    Figure 10 External Power Source 2.4 Setting the PROFIBUS Address The station address of GW-7557 can be set by using the DIP switch or by writing it directly to the EEPROM. The DIP switch covers a range from 0 to 255. The valid address range of a PROFIBUS station spans from 0 to 126.
  • Page 14 Table 6 The Address setting of the GW-7557 DIP switch Setting Description 1. The address setting of the EEPROM is ignored. 0~125 2. The address can not be set by the PROFIBUS configuration tool. 1. The address setting of the DIP switch is ignored. 2.

  • Page 15: Led Status Indicator

    2.5 LED status indicator The GW-7557 provides three LEDs to indicate the statuses of the GW-7557 module. The position of LEDs and descriptions are shown in Table 7 and Figure Table 7 LED status description LED Name Status Description Power supply is ok. flash HART port is transmitting or receiving HART frame.

  • Page 16: Normal/Setting Dip Switch

    Figure 12 LED position 2.6 Normal/Setting DIP switch There is a DIP switch on the back of the GW-7557 module, as shown in Figure 13. The DIP switch is used to set the communication settings of COM port. In the normal situation, it needs to set the DIP switch to the “Normal”...

  • Page 17: Jumper

    Figure 13 DIP switch of the GW-7557 2.7 Jumper There are four Jumpers (JP5~JP8) at the GW-7557 module, as shown in Figure 14. These jumper can provide HART channel with 250 Ω (1/4 W) resistor. When the pin 1&2 of JP5 is closed, the resistor will connect to HART channel 0. When the pin 2&3 of JP5 is closed, it will disconnect the resistor from HART channel 0.

  • Page 18: Profibus Data Exchange

    3. Communication protocol transfer theorem 3.1 PROFIBUS data exchange The GW-7557 is a PROFIBUS DP slave device. The GW-7557 is first parameterized then configured and finally it goes into the data exchange mode (Figure 15). Figure 15 State machine of PROFIBUS DP Slave device The GW-7557 exchanges data cyclically between internal Output Queue、Input Queue and PROFIBUS Master device in data exchange mode, as shown in Figure GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011)

  • Page 19: Hart Data Exchange

    Figure 16 Data exchange between PROFIBUS master device and GW-7557 The GW-7557 downloads the parameter and configuration from PROFIBUS master device to be the module parameters. The GW-7557 and PROFIBUS master device have different data type and data address, the GW-7557 can transfer different data format to PROFIBUS master device through module parameters.

  • Page 20: Communication Protocol Transfer

    Figure 17 Data exchange between the HART slave devices and the GW-7557 3.3 Communication protocol transfer In section 3.1 and 3.2, we can understand that data exchange is through Output Queue、Input Queue of the GW-7557 between PROFIBUS Master、HART slave devices and the GW-7557. The data exchange runs continuously between PROFIBUS master、HART slave device and the GW-7557, as shown in Figure 18 and Figure 19 GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011)
  • Page 21 Figure 18 GW-7557 communication protocol transfers GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 21...
  • Page 22 Figure 19 GW-7557 flowchart GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 22...

  • Page 23: Communication

    4. Communication 4.1 Field of application A master station can be a PLC, PC or any other smart device. The system can be a mono-master system (Figure 20) or a multi-master system (Figure 21). The GW- 7557 enables the integration of the HART slave devices into a PROFIBUS DP network.

  • Page 24: Gsd File

    Figure 21 Multi-master system 4.2 GSD file The characteristic (ex: baud rate, message length, number of input / output data..) of each PROFIBUS DP device is described in the GSD file. The GSD file of the GW-7557 is in the ICP DAS companion CD-ROM (PATH--> CD: \profibus\gateway\gw-7557\gsd\).
  • Page 25 Step 1: Open “SIMATIC Manager” tool and select “New Project Wizard” to open a new project. Step 2: Double Click “Hardware” to open “HW Config” Step 3: Click “Install GSD File” Step 4: Select the directory of GW-7557’s GSD file(IPDS0D61.gsd) GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 25...

  • Page 26: The Configuration Of The Common Parameters

    Step 5: Click “Install” button Step 6: Confirm GW-7552’s GSD file is available 4.3 The Configuration of the common parameters GW-7557 has twelve common parameters. The user can configure the common parameters to set the communication mode and data format by the PROFIBUS GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 26...
  • Page 27 configuration tool. The common parameters are described below. HART Frame Format：Transparent/Compact ● Error Retry Count：0~5 ● HART Command Interval (ms)：75~65535 ● Timeout Value (ms)：305~65535 ● HART Master Type(CH-0)：Primary/Secondary ● HART Master Type(CH-1)：Primary/Secondary ● HART Master Type(CH-2)：Primary/Secondary ● HART Master Type(CH-3)：Primary/Secondary ●...

  • Page 28: The Configuration Of The Modules

    4.4 The Configuration of the modules The user can set the number and size of the modules in the PROFIBUS configuration tool. The settings of the modules are described below. Max. modules：110 modules ● System setting module：13 bytes in, 6 bytes out ●...
  • Page 29 the below: Command 1 module parameters： Channel Number：Channel 2 ● Device Number：Device 0 ● Output Mode：Polling ● Example 2: If the user wants to enable burst mode and read primary variable by using burst mode. HART slave device connects with HART channel 3 of GW-7557, preamble length is 5、long address is 0xFB 0x01 0x00 0x12 0x67, network type of HART channel 3 is point to point.

  • Page 30: Diagnostic Messages

    slave device. b. Device Number：This parameter will decide device number of HART slave device. Device number must increase in order(ex: 3 HART slave devices, Device Number is Device 0、 Device 1、Device 2). c. Output Mode：  Initial => When GW-7557 start, it will send this command once. ...
  • Page 31 Output Channel out of Range Preamble length out of Range Output Mode is not Manual mode Burst Frame On HART BUS Burst modules too much Choose Wrong Module Input Data Error FIFO overflow Read Data from EEPROM ERROR EEPROM Error Write Data to EEPROM ERROR Output Data Error：...

  • Page 32: I/O Data Exchange

    GW-7557 to the PROFIBUS master. 4.6 I/O data exchange 4.6.1 Input data area The maximum length of input data is 240 bytes. Before arrange “Input module “or “HART Command module”, the user must arrange and configure the “system setting module”. The user can get data form HART slave devices by “read Input module”...
  • Page 33  Data input command (byte 12) The capacity of Output Queue is from 1 to 255. One level means there are level*2 or level*2-1 HART command in the Output Queue. (ex: level 5 means there are 9 or 10 HART commands in the Output Queue) 4.6.2 Output data area and communication command The maximum length of output data is 240 bytes.

  • Page 34: Establish Connection With Gw-7557

    GW-7557 module will all be cleared. Bit 1~7：The remaining bits have to be set to zero. Output HART Command module select (byte 2) ● If HART Frame Format is “Compact”, when this byte isn’t ‘0’ and the user change data output command (byte 0), it will trigger single data output command of the HART Command module (Output Mode is Manual) and this byte represent module address of the output module (ex: “byte 2”=3, it represent that the user want to trigger data output...
  • Page 35 Figure 22 Establish connection with GW-7557 First, users must load the electronic device description file (GSD file) of the GW- 7557 into the DP-Master, and then set the parameters. Finally change your DP- Master from Offline state to Operate state. While DP-Master changes to operate mode, GW-7557 will initial the modules.

  • Page 36: Data Exchange Example - Transparent Format

    4.8 Data exchange example — Transparent format In this example, we use Siemens S7-300 PLC (as a PROFIBUS master)、a GW- 7557 (as a PROFIBUS slave/HART master) and a HART slave device to read primary variable of HART slave device. Step 1: Copy the GSD file (Please refer to the section 4.2) and assign the GW-7557 a valid station address (Please refer to the section 2.4).
  • Page 37 Figure 24 Parameter settings of GW-7557 Step 4: Set the GW-7557 modules, as shown in Figure 25  Select “System setting” module: “System setting” module always has to be selected otherwise no communication can be established between the gateway and the Modbus network. ...
  • Page 38 Figure 25 Select modules Step 5: Click <Save and Compile> then click <Download> to download the configuration into PROFIBUS master, as shown in Figure 26 and Figure 27. GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 38...
  • Page 39 Figure 26 Click <Save and Compile> Figure 27 Click <Download> to download configuration into PROFIBUS master Note: In this example, device configurations of HART slave device are listed as follows.  HART channel：channel 2  Preamble length：0x07  HART frame type：Long frame GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 39...
  • Page 40  Manufacturer ID：0x16  Device type：0x85  Device ID：0x0B0A42 4.8.1 Communication test between PROFIBUS and HART (1) Establish output variable table Click Monitor/Modify Variables in main windows to establish variable table 1 and fill in address of PROFIBUS output area. Input “0x82 0x96 0x85 0x0A 0x0B 0x42 0x01 0x00”...
  • Page 41 Figure 29 fill in address of PROFIBUS output area Figure 30 fill in HART frame (2) Establish input variable table Click Monitor/Modify Variables in main windows to establish variable table 2 and fill in address of PROFIBUS input area. It shows “1 1 1 0 0 2 15 0”...
  • Page 42 0x0B 0x0A 0x42 0x01 0x07 0x00 0x10 0x0C 0x3E 0xC8 0x8A 0x70” in input are of 16 Words Input module (Please refer to section 4.6.1), The value of primary variable is 0.3916812, as shown in Figure 31 and Figure Figure 31 fill in address of PROFIBUS output area GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 42...
  • Page 43 Figure 32 Response data of HART frame Note: HART frame： Master to Slave frame Slave to Master frame GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 43...

  • Page 44: Data Exchange Example - Compact Format

    4.9 Data exchange example — Compact format In this example, we use Siemens S7-300 PLC (as a PROFIBUS master)、a GW- 7557 (as a PROFIBUS slave/HART master) and a HART slave device to read primary variable of HART slave device. Step 1: Copy the GSD file (Please refer to the section 4.2) and assign the GW-7557 a valid station address (Please refer to the section 2.4).
  • Page 45 between the gateway and the Modbus network.  Select “HART Command module” module: In this example a “Command 1” module is selected. Figure 35 Select modules Figure 36 Set module parameters of Command 1 module Step 5: Click <Save and Compile> then click <Download> to download the configuration into PROFIBUS master, as shown in Figure 37 and GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 45...
  • Page 46 Figure 38. Figure 37 Click <Save and Compile> Figure 38 Click <Download> to download configuration into PROFIBUS master Step 6: Set the device configurations of HART slave device by using PROFIBUS/HART gateway utility (please refer section 5.2). Step 7: Reset the power of the GW-7557 for an active setting. GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 46...
  • Page 47 Note: In this example, device configurations of HART slave device are listed as follows.  HART channel：channel 2  Preamble length：0x07  HART frame type：Long frame  Manufacturer ID：0x16  Device type：0x85  Device ID：0x0B0A42 4.9.1 Communication test between PROFIBUS and HART (1) Establish input variable table Click Monitor/Modify Variables in main windows to establish variable table 1 and fill in address of PROFIBUS input area.
  • Page 48 Figure 40 Response data of Command 1 Note: HART frame： Master to Slave frame Slave to Master frame GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 48...
  • Page 49 4.9.1 Burst mode test (1) Set the GW-7557 modules Select modules and download the configuration into PRORFIBUS master, as shown in Figure 41 and Figure 42.  Select “System setting” module: “System setting” module always has to be selected otherwise no communication can be established between the gateway and the Modbus network.
  • Page 50 、 、 Figure 42 Set module parameters of Command 1 Command 108 Command 109 module (2) Enable Burst mode Click Monitor/Modify Variables in main windows to establish variable table 1 and fill in address of PROFIBUS output area. Input “1” at PQB0、 input “3”...
  • Page 51 Figure 43 fill in address of PROFIBUS output area Figure 44 Send Command 108 Figure 45 Send Command 109 GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 51...
  • Page 52 (3) Receive Burst frame Establish variable table 2 and fill in address of PROFIBUS input area. The value PIW4 increase in order and the value of PIB13 ~ PIB19 always change. It means GW-7557 receives burst frame of command 1from HART slave continuously, as shown in Figure 46 and Figure 47.
  • Page 53 Figure 47 Receive burst frame of command 1 (4) Disable Burst mode In variable table 1, input “3” at PQB0、input “4” at PQB2 (module address of Command 109 module) and input “0” at PQB7, then click button to send command 109 to HART slave device for disable burst mode, as shown in Figure 48.
  • Page 54 Note:  GW-7557 just supports only one HART slave device in burst mode.  command 108：Write burst mode command number  command 109：Burst mode control 1 => enable burst mode 0 => disable burst mode  Output Mode of Command 108 module and Command 109 module set to “Manual”, because command 108 and command 109 don’t need send to HART slave device continuously.

  • Page 55: Application Of Utility

    5. Application of Utility 5.1 Install Utility 5.1.1 Install .Net Compact Framework： It needs the runtime environment with .NET Framework 4.0 or above to execute the utility in the PC. If there has .NET Framework 4.0 or above in the PC, the section 5.1 can be omitted.
  • Page 56 Step 3： Click the “Next” button to continue. If you want to change the installation destination, click “Browse” button to set the installation path. Figure 50 Set the installation path Step 4： Click the “Next” button to confirm installation Figure 51 Confirm installation GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 56...
  • Page 57 Step 5： Click the “Close” button to finish and exit the installation program Figure 52 Installation complete Step 6： After finishing the installation of the PROFIBUS/HART Gateway Utility, users can find the Utility as shown in the following screen shot. Figure 53 The path of Utility GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 57...

  • Page 58: Utility Introduction

    5.2 Utility introduction It introduces main window of the utility first, as shown in Figure 54. Figure 54 Main window of the utility Main window of the utility has 4 parts, they are (1)Connection status 、 (2)Connection control、(3)System information、and (4)Tools, as shown in the below.
  • Page 59  => 1. It means the com port of PC is open and PROFIBUS is in Offline state. 2. It means the com port of PC is open and trying to connect with the GW-7557.  => It means the PC connects with the GW-7557 successfully and PROFIBUS is in Operate state.
  • Page 60 (1) Device count of each HART channel If HART Frame Format is “Compact”, utility will read the module configuration of GW-7557 and show device count of each HART channel. Otherwise, if HART Frame Format is “Transparent”, device count always set to zero. (2) common parameters of PROFIBUS When the PC connects with the GW-7557 successfully and PROFIBUS is in Operate state, utility will show common parameters of PROFIBUS.
  • Page 61 Figure 56 Tools 5.2.4.1 Communication Settings： Figure 57 Communication Settings window The user can set communication settings of PC com port by this window. These settings have to be the same with the GW-7557, or else the connection will be failed. Port: Com 1~ Com 8 Baudrate: 2400~115200 bps Parity: None/Odd/Even...
  • Page 62 Figure 58 Device Configuration window In this window, it will show the configuration of the GW-7557 module. The user can setup the configuration of the GW-7557 module here. This window has 3 parts, they are(1)The node information、(2)Scan Device Configuration、and (3)Operation buttons, as shown in Figure 58. (1) The node information When the user selects the node at the left side of window, it will show the node information at the right side of window.
  • Page 63 It will pop a menu, the menu include “Edit GW- 7557 COM Port”. Right Edit GW-7557 COM Port： click The user can set communication settings of GW- 7557 com port by this window. Master Type：Primary Master/ Secondary Master Network Type：Point to Point/Multi Drop Channel Click Device Count：1~16...
  • Page 64 A. About “Edit GW-7557 COM”： The user can set communication settings of GW-7557 com port in this window, as shown in Figure 59. When user click <Save to Device> button, these settings will be save to EEPROM of GW-7557. Figure 59 “Edit GW-7557 COM” window B.
  • Page 65 C. About “Save to File” The user can click “Save to File” to open a save file dialog to save single HART slave device settings to a file (*.info) for backup, as shown in Figure 61. Figure 61 “Save to File” D.
  • Page 66 Figure 63 “Device Test” (2) Scan Device Configuration If the user enables this function, the system will detect HART frame type, address, preamble length, manufacturer ID, device type and device ID automatically, as shown in Figure 64. GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 66...
  • Page 67 1. Select Channel & Click OK 2. Click Yes Figure 64 “Scan Device Configuration” Note： Before the user enables this function, the user must confirm that there is only one HART slave device in each HART channel, or else this function will be failed.
  • Page 68 A. Save to GW-7557： The user can click “Save to GW-7557” button, t hen all HART slave device onfiguration will save to EEPROM of GW-7557. B. Save Project File： The user can click “Save Project File” button to open a save d ialog to save ll HART slave device configurations to a file (*.pj) for backup.

  • Page 69: Establish Connection With Gw-7557

    Figure 67 “About” window 5.3 Establish connection with GW-7557 The connection of Utility and GW-7557 is shown in Figure 68. Please follow the steps to establish connection. Step 1: Wire COM Port of PC to RS-232 port of GW-7557. Step 2: Connect PROFIBUS cable between PROFIBUS Master station and GW- 7557 and enter data exchange mode (please refer step 1~7 of section 4.9 for detail).
  • Page 70 About default settings are shown in the below: Baudrate：115200 bps Data bit：8 bits Stop bit：1 bit Parity：None Figure 69 COM port settings of utility Step 4: Click “Connect” button GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 70...
  • Page 71 Figure 70 Click “Connect ” button Step 5: Traffic light shows green in the utility now; it means the connection is successful. Figure 71 Connection status GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 71...

  • Page 72: Troubleshooting

    6. Troubleshooting The troubleshooting list can help users to resolve the problems when using the GW- 7557. If the problem still can't be solved, please contact with technical staff of ICP DAS. Table 12 Errors and solutions Item Trouble state Solution 'PWR' LED indication of The power supply of GW-7557 has some problems.

  • Page 73: Dimensions

    7. Dimensions GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 73...
  • Page 74 GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 74...

  • Page 75: Appendix A. Hart Command

    Appendix A. HART Command We extracted parts of the HART universal command here. Command 0: Read Unique Identifier Request data bytes: none Response data bytes: 2+12 = 14 Index format description Byte 0: uint8 Response code 1 Byte 1: uint8 Response code 2 Byte 2: uint8 254 Byte 3: uint8 Manufacturer ID Byte 4: uint8 Manufacturer’s device ID...
  • Page 76 Byte 6~9: float Primary Variable Percentage of Range Command 3: Read Dynamic Variables and P.V. Current Request data bytes: none Response data bytes: 2+24 = 26 Index format description Byte 0: uint8 Response code 1 Byte 1: uint8 Response code 2 Byte 2~5: float Primary Variable Current Byte 6: uint8 Primary Variable Unit code Byte 7~10: float Primary Variable...
  • Page 77 Byte 4: uint8 Manufacturer’s device ID Byte 5: uint8 Number of preambles needed in the request Byte 6: uint8 Command set revision number Byte 7: uint8 Transmitter specific revision code Byte 8: uint8 Software revision Byte 9: uint8 Hardware revision Byte 10: uint8 Flags Byte 11~13: uint24 Device ID number (MSB first) Command 12: Read Message...
  • Page 78 Byte 10~13: float Lower sensor limit Byte 14~17: float Minimum span Command 15: Read Primary Variable Output Information Request data bytes: none Response data bytes: 2+17 = 19 Index format description Byte 0: uint8 Response code 1 Byte 1: uint8 Response code 2 Byte 2: uint8 Alarm select code Byte 3: uint8 Transfer function code Byte 4: uint8 PV range value unit code...
  • Page 79 Index format description Byte 0~5: PA6 TAG Name Byte 6~17: PA12 Descriptor Byte 18: uint8 Day of month Byte 19: uint8 Month of year Byte 20: uint8 Year as offset to 1900 Response data bytes: 2+21 = 23 Index format description Byte 0: uint8 Response code 1 Byte 1: uint8 Response code 2 Byte 2~7: PA6 TAG Name...

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