Denso BHT-7500 - Manual (Page 144)

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3.1 Spread-Spectrum Communication
(BHT-7500S/7500W only)
3.1.1 Notes for Wireless Operations
• If there are too many communications errors, first make sure that the BHT points
directly at an access point because the 2.4-GHz band requires a more or less
straight line path. Note also that the low-power radio waves have trouble passing
through human bodies and other obstacles along that path.
• The radio link will not operate properly in the vicinity of microwave ovens, industrial
heaters, high-frequency medical equipment, and other sources of radio waves in
the 2.4-GHz band.
• Electromagnetic noise from personal computers, refrigerators, and other home
appliances can also interfere with link operation.
• Environmental factors that can also interfere with link operation include large
metallic objects, metallic dust, or metallic walls in the vicinity of the path and
vibration at either end.
To System Designers:
• Before developing the application, make sure that the intended environment is free
of the interference factors above and thus actually capable of supporting link
operation.
• Assume that there will be communications failures requiring robust retry
capabilities in the software.
3.1.2 RF-Related Parameters
Programs written in BHT-BASIC control wireless communication with commands be-
tween the BHT terminals and access points which are connected each other by a
wireless LAN.
BHT-7500S
For the setting procedure of RF-related parameters, refer to Subsection 2.5.3, "[ 8 ] RF
Menu BHT-7500S."
■ Domains
It is necessary to group a wireless LAN into domains and assign them with unique
domain names. A domain name should be included in the IDs of access points.
You may roam between access points during wireless communication if those access
points are within wireless networks having a same domain name.
For the setting procedure of domain names, refer to Subsection 2.5.3, [ 8 ] RF Menu.