Chengdu Ebyte Electronic Technology Co., Ltd.
E90-DTU（2G4L27）User Manual
Copyright ©2012–2020
，成都亿佰特电子科技有限公司
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10. Operation notes
1. Please keep the warranty card of this equipment safely. The factory number (and important technical parameters) of
the equipment is on the warranty card, which has important reference value for future maintenance and new
equipment.
2. During the warranty period, if the radio is damaged due to the quality of the product itself, not caused by human
damage or lightning, please enjoy the free warranty. Please do not repair it yourself. If there is any problem, please
contact us. After sales service.
3. The device may not be operated in the vicinity of some flammable places (such as coal mines) or explosive
dangerous objects (such as detonators for detonators).
4. Appropriate DC stabilized power supply should be selected, which requires strong anti-high frequency interference,
small ripple, and sufficient load capacity; it also has functions such as overcurrent, overvoltage protection and
lightning protection to ensure data transmission.
5.
Do not use it in a working environment that exceeds the environmental characteristics of data transceiver, such as
high temperature, humidity, low temperature, strong electromagnetic field or dusty environment.
6. Do not let the data transceiver continuously be in full-load transmission state, otherwise the transmitter may be
burned out.
7. The ground wire of the data transceiver should be well connected with that of the external equipment (such as PC,
PLC, etc.) and of the power supply. Otherwise, it is easy to burn the communication interface; do not plug or unplug
the serial port when electrified.
8. When testing the data transceiver, it must be connected with a matching antenna or a 50Ω dummy load, otherwise it
will easily damage the transmitter; if the antenna is connected, the distance of the human body from the antenna
should preferably exceed 2 meters to avoid injury and cut. Do not touch the antenna while launching.
9. Wireless modem often have different communication distances in different environments. The communication
distance is often affected by temperature, humidity, obstacle density, obstacle volume, and electromagnetic
environment. In order to ensure stable communication, it is recommended to reserve, Communication distance
margin above50. %.
10. If the measured communication distance is not ideal, it is recommended to check the antenna quality and the
installation method of the antenna. You can also contact support@cdebyte.com for assistance.
11. Power supply is required to remain 50% of current, it should be noted that the ripple should not exceed 100mV.
12. Wireless communication products need to be connected with an impedance matching antenna to work properly, even
for short-term testing.
Summary of Contents for 2G4L27
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