Banner SureCross DX80 Product Manual

Also see for SureCross DX80: Network manual Installation & operation manual Reference guide Quick start guide Manual

Contents

Banner SureCross DX80 Product Manual Manual pdf 20 page image

Result DescriptionMissed Packets not received on the first transmission and requiring a re-try.Judging if the reliability of a network’s signal meets the needs of the application is not simply a matter of green, yellow,and red packets received. In normal operating mode, when data packets are not received, the transmitter re-sends thepacket until all data is received.For slow monitoring applications such as a tank farm, where data is required in terms of seconds or minutes, receivingmost of the data in the ‘red’ range, indicating a weak but reliable signal, transmits enough data for accurate monitoring.Nodes positioned near the outside range of the radio signal may have 90% of the data packets received in the red zone,again indicating a weak, but reliable signal.A good suggestion is to keep the missed packets average to less than 40%. When the network misses more than 40% ofthe data packets, the signal is usually too unreliable or obstacles may be interfering with the signal. When Site Survey re-ports the missed packets are 40% or higher, improve the radio system performance by:• Mounting the network’s antennas higher,• Using higher gain antennas, or• Adding data radios to the network.Mounting the devices’ antennas higher allows the radio signal to clear obstacles in the area and improves the line of sightbetween SureCross® devices. Higher gain antennas focus the energy of the radio signal in a specific direction and extendthe signal’s range. Using data radios is another option to consider when trying to extend the range of a radio network. Formore information on data radios, please refer to Banner’s white paper on range extension on www.bannerengineer-ing.com/surecross.3.7.4 Site Survey TroubleshootingSome tips and tricks about improving radio signal reception may improve the site survey results.Problem SolutionMarginal Site Survey (RSSI) Re-sultsIf the distance between devices is greater than about 5,000 meters (3 miles) line-of-sight *OR* objects, such as trees or man-made obstructions, interfere with the path,and the MISSED packet count exceeds 40 per 100 packets, consider the followingsteps:• Raise the DX80 units to a higher elevation, either by physically moving the de-vices or installing the antenna(s) remotely at a higher position.• Use high-gain antenna(s) such as Yagi and/or Omni (see Accessories).• Decrease the distance between devices.• Use data radios to extend the position of the Gateway relative to the host sys-tem.SureCross DX80 and Performance DX80 Product Manual20 www.bannerengineering.com - tel: 763-544-3164 Rev. J