Chengdu Ebyte Electronic Technology Co,;Ltd E 90-DTU (230N33) user manualCopyright ©2012–2019,Chengdu Ebyte Electronic Technology Co,;Ltd 162. Transceiver during the warranty period, if the quality of the product itself rather than man -made damage orlightning and other natural disasters caused by damage, enjoys free warranty; please do not repair by yourself, theproblem and please contact with our company when problem occurring, we offer the first -class after-sales service.3. Please do not operate the transceiver in some flammab le p laces such as coal mines or near explosive at mospheres(such as detonators).4. Please use the appropriate DC power supply, high frequency interference ab ility, s mall ripple, and enough loadcapacity are required; it’s better to have over current, over vo ltage protection and lightning protection and othe r functionsto ensure that transceiver working properly.5. Please do not use it in the working environment beyond the transceiver environ mental characteristics , such ashigh temperature, humidity, low temperature, strong electromagnetic fields or dust large r environment.6. Please do not continuously keep transceiver to transmit in full capacity, or the transmitter might be damaged.7. Please connect the ground with the external ground of the power supply (such as PC, PLC, etc.) , otherwise it iseasy to burn out the communication interface; do not plug the interface with power supplying.8. When testing, please connect the antenna or 50 Ω load, otherwise transceiver will be damaged easily ;the distancefrom the antenna is better than 2 meters, so as to avoid harm, please do not touch the antenna when transmitting.9. Wireless data transceiver has different communication distance in different environ ments , communicationdistance is influenced by temperature, humid ity, obstacle density, obstacle volume and electro magnetic environment; inorder to ensure stable communication, it is recommended to reserve at least 50 % of the communication distance.10. When communication d istance is not perfect, it is reco mmended to imp rove the antenna quality and theinstallation mode of the antenna. You can send mail to support@cdebyte.com for support.11. When choosing power supply, it is reco mmended to keep at least 50% current left and the ripple must not exceed100mV.12.Important statement1. CDEBYTE reserves the right of final interpretation and modification of all the contents of this manual.2. As the hardware and software products continuously improving, this manual may subject to change without notice,please refer to the latest version.3. Everyone is responsible for protecting the environ ment: to reduce the use of paper, we only prov ide electronicdocuments of the English manual, if necessary, please go to our official website to download; In addition, for specialrequirements, we agree to offer certain amount of documents according to o rder quantity, not every data transceiver aresupplied with one manual, please understand;