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Intab AirGate-Modbus, Instruction Manual

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AirGate-Modbus

 

 

INTAB INTERFACE-TEKNK AB 

 

14/22

 

 

DATA COMMUNICATION – WIRELESS 

The AirGate-Modbus has a IEEE 802.15.4 Wireless communication interface to connect to the other Novus equipment that uses the 
same  communication  interface.  As  of  firmware  version 

V1.23

,  the  AirGate-Modbus  allows,  not  only  communication  with  other 

AirGates, as described in the chapters 

Operation Modes

 and 

Using the Operation Modes

, but also the option to communicate the 

RHT-Air  equipment  units,  which  are  Wireless  transmitters  of  temperature,  humidity,  and  dew  point.  Each  AirGate-Modbus  can 
support the connection of 8 AirGate-Modbus equipment units and 35 RHT-Air equipment units. Each of these 8 AirGate-Modbus 
equipment units allows the connection of over 8 AirGates and 35 RHT-Air up to the limit of 4 levels of depth, as illustrated in 

Fig. 

16

. This network topology is formed automatically at the moment the network begins. One only needs to configure at least one 

AirGate-Modbus as a Multi-Master operation mode, USB-Master or RS485-Master and the other equipment: (i) AirGate-Modbus, 
with the RS485-Slaves operation mode; and (ii) RHT-Air, all with the same PAN ID. After the configuration, the equipment units will 
automatically be paired based on the best communication link (LQI) that is found. 

For  a  correct  functioning  of  the  wireless  communication  network,  it  is  important  for  all  equipment  to  have  the  same  firmware 
version.  If  you  have  AirGate-Modbus  equipment  with  a  firmware  version  below 

V1.23

  and  wish  to  use  the  new  functionalities 

available in this version, such as a tree  network topology that is totally wireless, or operation with RHT-Air equipment, you only 
have to update the firmware of all the equipment or use a AirGate-Modbus with the new version of the firmware operating - such 
as RS485-Master - in another PAN ID, connected to interface RS485 in one of the AirGates operating as RS485-Slaves of the first 
PAN ID, as shown in the 

Long Reach Application

. 

 

Fig. 12

 - Totally wireless Tree network topology with AirGate-Modbus and RHT-Air equipment

 

Summary of Contents for AirGate-Modbus

Page 1: ... MODBUS REGISTERS 17 ACCESSORIES 22 WARRANTY 22 INTRODUCTION AirGate Modbus is an equipment with a link interface function between a network with Modbus RTU protocol about RS485 and a wireless network with proprietary protocol about IEEE 802 15 4 Resulting from an advanced technological development the product stands out in many aspects such as high performance high connectivity and easy setup and...

Page 2: ...ID Data encryption AES CBC 128 Advanced Encryption Standard CONNECTIONS Power source connector USB Device Mini B RP SMA Female connector Plug Two connectors for RS485 Modbus RTU interface POWER SOURCE Voltage from 10 to 35 Vdc Maximum energy consumption 70 mA in 24 V ENVIRONMENTAL CONDITIONS Operation Temperature 0 to 70 C Relative humidity 80 up to 30 ºC ELECTROMAGNETIC COMPATIBILITY EN61000 4 2 ...

Page 3: ...mmunication interface RS485 according to Legend Voltage supply Fig 2 Caution when connecting the power supply wires in AirGate Modbus If the positive conductor of the power source is turned on even if momentarily to one of the communication link terminals the AirGate Modbus may be damaged Fig 2 Power supply and communication connections of the AirGate Modbus Fig 3 shows the electrical connections ...

Page 4: ...no communication through the USB interface after 1 minute this will go back to normal functioning LEDS When turning the equipment on the Status LED starts to flash quickly until the AirGate Modbus connects to a wireless network In the moment that the AirGate Modbus is connected to a wireless network the Status LED remains turned on When the setup button is pressed the Status LED flashes slowly unt...

Page 5: ...lexing of the USB and RS485 for IEEE 802 15 4 In this mode AirGate Modbus uses the RS485 and USB interfaces for the multiplexing of Modbus masters The masters must be directly linked to these interfaces The wireless interface is used to communicate with other AirGate Modbus devices in RS485 SLAVES operation mode When this operation mode is used a Timeout is needed to ensure that each of the master...

Page 6: ...O THE MODBUS MASTER Division of a wired network in wired segments interconnected by wireless segments Wireless segments located close to the Modbus master which communicates by USB port It allows the AirGate Modbus using as a USB RS485 convertor for the first wired segment Fig 6 illustrates this possible application Fig 5 Wireless segments close to the Modbus master WIRELESS SEGMENTS CLOSE TO MULT...

Page 7: ... Fig 6 to expand the network an AirGate Modbus configured as a RS485 SLAVES Firmware 1 23 was inserted with the same PAN ID 5670 In another segment two AirGates were assembled using the RS485 interfaces an AirGate Modbus operating the RS485 SLAVES mode and an AirGate Modbus operating in RS485 MASTER mode In this segment a new PAN ID 5671 was created starting a new star network Fig 6 Topology in tr...

Page 8: ... When installing the setup software the USB Serial Port driver of AirGate Modbus may be automatically installed according to Fig 10 Fig 8 Selection of components DigiConfig has a complete help file with all necessary information for its full usage To consult the help start the application and select the Help menu or press the F1 key In case you don t have the CD which accompanies the AirGate Modbu...

Page 9: ...giConfig software via USB interface being necessary to put the device in setup mode To enter this mode simply press the SETUP BUTTON checking that the STATUS LED now flashes slowly approximately once per second In setup mode the device stops behaving as a gateway from a Modbus network and starts to accept the configurations In the main screen of the DigiConfig software Fig 12 the following configu...

Page 10: ...L PORT COM WINDOWS DETERMINATION The serial port associated to the AirGate Modbus is automatically determined by the operational system a few instants after the connection of the AirGate Modbus The user may easily identify or alter the COM port associated to the AirGate Modbus accessing the Windows Device Manager Control Panel System Hardware Device Manager COM LPT Ports It s also possible to open...

Page 11: ... Some serial ports may be marked as In Use Only select one of these ports in case you are sure that it is not being used by another peripheral of your computer In some situations the serial ports may be marked as in use even when the associated device is not installed anymore in the computer In this case it is safe to associate this port to the AirGate Modbus Fig 14 Accessing the advanced configur...

Page 12: ...TER of the OPERATION MODES chapter Noting that in this case the Timeout configured in each network master must be at least double the time configured for AirGate Modbus OPERATION MODES According to the desired functionality the AirGate Modbus can be configured with different operation modes These are distinguished altering the functions of the communication interfaces as explained in the OPERATION...

Page 13: ...485 AND USB INTERFACE The RS485 and USB interfaces may be configured to operate in the following speeds baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200 Besides that it may be configured to operate with one or two stop bits and in the parities even uneven and none More details about the implementation of a Modbus devices network via RS485 can be found in the document Basic RS485 and RS4...

Page 14: ...ds to configure at least one AirGate Modbus as a Multi Master operation mode USB Master or RS485 Master and the other equipment i AirGate Modbus with the RS485 Slaves operation mode and ii RHT Air all with the same PAN ID After the configuration the equipment units will automatically be paired based on the best communication link LQI that is found For a correct functioning of the wireless communic...

Page 15: ...quency Among these 15 possible channels the network operates on the channel that has the lowest interference CHANNEL OPERATION FREQUENCY 11 2405 MHz 12 2410 MHz 13 2415 MHz 14 2420 MHz 15 2425 MHz 16 2430 MHz 17 2435 MHz 18 2440 MHz 19 2445 MHz 20 2450 MHz 21 2455 MHz 22 2460 MHz 23 2465 MHz 24 2470 MHz 25 2475 MHz Table 3 Operation Channels REGISTER 36 LINK QUALITY INDICATOR RX FATHER States the ...

Page 16: ...he LQI will behave similarly to the contents of the graph shown in Fig 17 where a comparison between different levels of power for the Distance versus LQI ratio is made Fig 13 Ratio between Distance and LQI for several power levels Table 4 lists the values obtained in the LQI reading with an evaluation of the signal quality This same information can be seen in a more intuitive fashion on the Diagn...

Page 17: ...age every time it receives packages in the RS485 or USB interface If enabled can the CRC is not correct the packet is not forwarded to the rest of the network 0 Disabled 1 Enabled R W 9 Enables on inhibits the use of cryptography in wireless communication When enabled all the devices of a single PAN ID should have their cryptography enabled and use the same SECURITY_KEY 0 Disabled 1 Enabled R W 10...

Page 18: ...operation mode in the RS485 interface of the device To facilitate connectivity with devices from different manufacturers when configured with ParityNone_StopBits1 or ParityNone_StopBits2 the device always transmits using 2 stop bits and receives with 1 stop bit This allows for communication with devices with both configurations but this feature is only available with the RS485 interface 0 Parity N...

Page 19: ...0 when the device is in configuration mode or is the network coordinator that does not have a father 100 15 R 37 Indicates the number of children AirGates in operation mode RS485 Slaves RHTs Air that the device has 0 43 R 38 ADDR_FILHO register This register is used to request the AirGate Modbus information about its children This register should include the Modbus address of the child that requir...

Page 20: ...Hz obtained when starting the network The noise is measured with the power of the noise level of the channel measures in dBm and can vary from 100 dBm clean channel to 15 dBm dirty channel 100 15 R 53 Noise in channel 15 frequency 2425 MHz band 2 MHz obtained when starting the network The noise is measured with the power of the noise level of the channel measures in dBm and can vary from 100 dBm c...

Page 21: ...haracter 0 65535 R W 66 Used so the user can identify the device Each byte corresponds to an ASCII character 0 65535 R W 67 Used so the user can identify the device Each byte corresponds to an ASCII character 0 65535 R W 68 Used so the user can identify the device Each byte corresponds to an ASCII character 0 65535 R W From here on out are the protected registers 1000 Reserved 0 1 R 1001 Long MAC ...

Page 22: ...better positioning of the AirGate Modbus antenna On its ends there are RP SMA Male connectors for connection with AirGate Modbus and RP SMA Female for connection with the Antenna There is no need to buy a new antenna because the one from AirGate may be used WARRANTY Warranty conditions are available on our web site www novusautomation com ...

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