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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
13.
RF SETUP / RF SECURITY
1.
Clear Line of Sight
A clear line of sight with minimal obstructions is necessary for best wireless (RF)
communication. Performing an RF survey is highly recommended prior to
commissioning.
2.
Maximum RF Range*
900/915 MHz: Up to 7500 Feet / 1.4 Miles / 2.3 km
Refer to 900/915 MHz RF Range Guide
2.4 GHz: Up to 4.3 Miles / 7 km with Clear Line of Sight*
Refer to 2.4 GHz RF Range Guide
868 MHz: Up to 5.2 Miles / 8.4 km
*The maximum RF range data was collected under optimal test conditions, including a clear
line of sight between antennas. Actual wireless RF range may vary depending on location, RF
interference, weather, antenna type, cable type, and line of sight.
3.
Received Signal Strength Indication (RSSI)
RSSI value can be exported as a Modbus register to monitor the RF health
from end transmitter(s) to a gateway.
RSSI Reading:
Excellent = 40-75; Good = 76-90; Weak = 91-115
4.
RF Timeout Tag
When setting up Transmitters, RF Timeout tag can be added as a Modbus
register for monitoring RF health. The timeout trigger is normally set to
three times the Tx interval. This means when the data packet is missed on
three consecutive interval attempts, the RF timeout will be flagged.
0=RF OK; 1= RF Timeout
5.
RF Refresh Tag for Ensuring RF and Device Health
When setting up transmitters, RF Refresh tag can also be added as a
Modbus register for trending RF data using a third-party device.
6.
Maximum Number of End Transmitter Support per Gateway
Each Gateway can support a maximum of 63 Transmitters. This can be a
combination of Wireless Transmitters and Wireless I/O Modules.
Major factors that contribute to actual support of maximum End
Transmitters depends on the transmission frequency, RF frequency, RF
propagation, RF data (bit) rate, and physical/geographical limitation or
challenges as well as RF interferences.
If a Gateway is also connected wirelessly to other Gateways for peer-to-
peer data sharing and control applications, achieving 63 maximum end
Transmitter support may not be feasible due to limitation of RF budget,
speed, and processing payload.
When a project requires usage of more than 10 end Transmitters per
Gateway or is more complex than a basic Wireless Sensor Network that
involves a Gateway and a handful of End Transmitters, please consult with
an OleumTech Application Engineer or a Certified Specialist to properly
commission a project.
Содержание WT H2S Series
Страница 6: ...Page 6 WIRELESS H2S TRANSMITTER WT SERIES USER GUIDE 3 Intrinsic Safety Control Drawings...
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Страница 33: ...Page 33 WIRELESS H2S TRANSMITTER WT SERIES USER GUIDE 16 SOFTWARE MAIN SCREEN VIEW...
