NOVUS AirGate-Modbus User Manual
AirGate-Modbus
AirGate-Modbus
INSTRUCTIONS MANUAL
V1.1x C
INTRODUCTION ................................................................................................................................................................. 1
SPECIFICATIONS .............................................................................................................................................................. 2
CONNECTION AND INSTALLATION ................................................................................................................................. 3
OPERATION ....................................................................................................................................................................... 4
OPERATION MODES ......................................................................................................................................................... 5
USING THE OPERATION MODES .................................................................................................................................... 6
LONG REACH APPLICATION ............................................................................................................................................ 7
SETUP SOFTWARE ........................................................................................................................................................... 9
CONFIGURATION MODES .............................................................................................................................................. 10
DETERMINATION AND SELECTION OF THE SERIAL PORT (COM) - WINDOWS ....................................................... 11
CONFIGURATIONS - AIRGATE-MODBUS ...................................................................................................................... 13
DATA COMMUNICATION - SERIAL ................................................................................................................................. 14
DATA COMMUNICATION – WIRELESS .......................................................................................................................... 14
MODBUS COMMANDS .................................................................................................................................................... 15
DESCRIPTION OF SOME REGISTERS ........................................................................................................................... 16
HOLDING REGISTERS TABLE ........................................................................................................................................ 18
SUPPORTED MODBUS REGISTERS.............................................................................................................................. 18
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
operation. This technology is presented as the ideal solution for applications which require flexibility and interoperability.
Its main characteristics are:
• SMA connector for antenna;
• 2 dBi antenna;
• Two connectors for one RS485 Modbus RTU interface;
• USB Device (Mini-B);
• Status indicator LEDs;
• Button used to enter setup mode.
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SPECIFICATIONS
COMMUNICATION CHARACTERISTICS:
Maximum transmission power: 100 mW;
Range: 1000 meters line-of-sight in open field.
Data rate: RF 250 Kbps;
Baud rate serial: 1.200 to 115.2 Kbps;
Receptor's sensibility - 92 dBm;
Setup via Software Windows®.
NETWORK AND SECURITY:
ISM Operation Band: 2.4 GHz;
DSSS Technology - Direct Sequence Spread Spectrum;
OQPSK Modulation - Offset Quadrature Phase Shift Keying;
Point-to-point, star, or tree network typologies;
15 operation channels;
Network Identifier: (PAN 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.
AirGate-Modbus
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, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, CISPR11.
PHYSICAL CHARACTERISTICS:
Weight: 110 g.
PA66 housing for DIN rail mount;
Dimensions: 99.5 x 114 x 17.5 mm.
Protection Degree: IP20
Internal protection against inversion of the power supply voltage polarity.
Wire gauge: 0.1 to 3 mm² (28 to 12 AWG). Recommended torque: 0.4 Nm
CERTIFICATES:
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AirGate-Modbus
conductor of the power source is turned on, even if momentarily, to one of the
CONNECTION AND INSTALLATION
MECHANICAL INSTALLATION
AirGate-Modbus has its own enclosure, to be installed in a 35 mm trail.
For the installation in the trail, the metallic hook in the base must be located and pressed against the trail.
DIMENSIONS:
The dimensions of AirGate-Modbus are shown in Fig. 1.
Fig. 1 - Dimensions of AirGate-Modbus.
ELECTRICAL INSTALLATIONS
AirGate-Modbus has power supply connectors and serial communication interface RS485 according to Legend: Voltage
supply Fig. 2.
Caution when connecting the power supply wires in AirGate-Modbus. If the positive
communication link terminals, the AirGate-Modbus may be dama ged.
Fig. 2 - Power supply and communication connections of the AirGate-Modbus.
Fig. 3 shows the electrical connections needed. Terminals 1, 2 and 3 are destined for the communication with Modbus
network. These terminals are internally connected to terminals 4, 5 and 6. The terminals 7, 8 and 9 are used for AirGateModbus power supply.
Fig. 2 – Electrical connecti ons of AirGate-Modbus.
INSTALLATION RECOMMENDATIONS
• Input conductors must go through the system plant separated from the output and power supply conductors, in
grounded conduits.
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AirGate-Modbus
The Communication LED flashes to show that the device is receiving packages through any
OPERATION
In the frontal panel are found an mini-B USB connector, a SMA connector for the antenna, a setup button and two LEDs
for status indication. See Fig. 4.
Fig. 3 - AirGate-Modbus frontal panel
USB
The USB interface of AirGate-Modbus is used for setup. Depending on the operation mode set, this interface can be
connected to a PC functioning as master of the Modbus RTU network.
SETUP BUTTON
When press the button, AirGate-Modbus enters setup mode and waits the configuration by the USB interface. If there is
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 AirGateModbus 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 until AirGate-Modbus quits
operation mode. There are 3 possible ways to quit setup mode:
• Clicking in the setup button again;
• Applying a configuration successfully;
• Waiting 1 minute.
of its interfaces and is forwarding correctly. The speed of the flashing is according to the
communication speed.
When the Firmware of the AirGate-Modbus is being updated, the Communication LED will
start to flash and the LED Status will be off.
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AirGate-Modbus
OPERATION MODES
AirGate-Modbus can be configured with 4 different operation modes:
RS485-MASTER
Simple Forwarding between RS485 and IEEE 802.15.4
In this mode AirGate-Modbus uses the RS485 interface to communicate with a Modbus Network. And the wireless
interface to communicate with other AirGate-Modbus devices in RS485-SLAVES operation modes.
RS485-SLAVES
Simple forwarding between IEEE 802.15.4 and RS485
In this mode AirGate-Modbus has the objective of continuing the Modbus network. It uses the wireless interface to
communicate with another AirGate-Modbus, where the network master is located. The RS485 interface is used to
communicate with Modbus slaves.
As of firmware version V1.23, when operating in this mode of operation, the AirGate-Modbus can begin to automatically
perform the repeater function. This function does not require any special configuration. When configured in this mode of
operation, after the AirGate-Modbus finds a father (RS485-Master, USB-Master, Multi-Master, or even another RS485Slaves) it then is able to offer the option of having children, allowing other AirGates that are also operating with RS485Slaves to automatically pair with it.
USB-MASTER
USB Routing for RS485 and IEEE 802.15.4
In this mode AirGate-Modbus uses the USB interface to communicate directly with a Modbus master and its RS485
interface to communicate with a Modbus slave’s network. The wireless interface is used to communicate with other
AirGate-Modbus devices in RS485-SLAVES operation mode.
MULTI-MASTER
Multiplexing 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 masters have an usage time in the
network. This Timeout is automatically adjusted by DigiConfig software according to the baud rate used by the
interfaces, as it can be seen in the chapter “CONFIGURATIONS - AIRGATE-MODBUS” in the section “TIMEOUT”.
Depending on the number of slaves and of the response time of each slave, it may be necessary to adjust this Timeout
to reduce possible communication error s .
It's important to emphasize that the Timeout configured for this operation mode refers to a time interval managed
automatically by the AirGate-Modbus. The network masters plugged in each one of the USB and RS485 interfaces must
have their Timeouts configured with double the time set in AirGate-Modbus Timeout.
COMPLEMENTARY MODES
Only devices with distinct functions form a wireless communication network. The operation form of some modes also
imposes connection restrictions. The modes compatible with the wireless connection may be seen in Table 1:
Mode Connects with
RS485-MASTER RS485-SLAVES
USB-MASTER RS485-SLAVES
MULTI-MASTER RS485-SLAVES
RS485-SLAVES * RS485-SLAVES
Table 1 - Complementary modes
* The RS485-SLAVES operation mode only begins to offer the option of having children (behaving as a repeater) after
having paired with a father that is already operating on the network. This entire process is done automatically, without
any intervention from the operator.
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AirGate-Modbus
USING THE OPERATION MODES
WIRELESS SEGMENTS IN ANY POINT OF AN MODBUS NETWORK
Division of a wired network in wired segments interconnected by wireless segments. The division occurs far from the
Modbus master. It uses the RS485 port AirGate-Modbus to communicate with the master and the slaves. Additional
wireless segments can be inserted. Fig. 5 illustrates this possible application.
Fig. 4 - Wireless segments in any point of a Modbus network
WIRELESS SEGMENTS CLOSE TO 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 MULTIPLEXED MODBUS MASTERS
Multiplexing of 2 masters, one connected to the USB interface and another to the RS485. Wireless section located close
to the Modbus masters. It also allows the usage of a single master in any of the 2 interfaces (USB or RS485).
Fig. 7 - Wireless segments close to the multiplexed Modbus masters
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AirGate-Modbus
LONG REACH APPLICATION
In seeking to expand the network, in order to obtain a greater distance, it is possible to assemble a tree shaped topology.
As exemplified in Fig. 8, 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 tree style
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