NOVUS AirGate-Modbus - Manual (Page 14)

AirGate-Modbus
NOVUS AUTOMATION 14/22
DATA COMMUNICATION - SERIAL
The AirGate-Modbus possesses two communication interfaces:
• RS485, acting as communication interface with Modbus RTU protocol.
• USB device, acting with the communication interface of Modbus RTU protocol.
RS485 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 RS422 Concepts”, available in the CD which accompanies the product or in the
www.novusautomation.com
website. The Table 2 helps the connection of the RS485 communication interface connectors.
D1 D D+ B Bidirectional data line Terminals 1 and 4
D0 D D- A Inverted bidirectional data line. Terminals 2 and 5
C
Optional connection which improves the communication performance Terminals 3 and 6
GND
Table 2 - RS485 connections
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