Section: Technical Support / Q&A
While using the EBYTE E52-400NW30S and E52-900NW30S modules, engineers often run into the same issues. I've compiled this FAQ based on the datasheet and my own experience — hope it helps!
Q1: Actual transmission distance is far less than 4km. What can I do?
A: The 4km figure is an ideal value measured in clear open areas with 7Kbps air rate, 3.5dBi antenna gain, and 2.5m antenna height. In real-world use, these factors reduce range:
Obstacles: Walls, trees, and metal objects significantly attenuate the signal.
Air data rate: 7Kbps → 21.875Kbps can drop range to ~2km; 62.5Kbps may yield only ~1.6km.
Supply voltage: Make sure voltage is ≥5.0V, otherwise transmit power drops.
Antenna quality: Use an antenna with 3.5dBi gain or higher, and keep it away from metal objects.
Q2: The module gets very hot. Is this normal?
A: Yes, this is normal. The transmit current is up to 710 mA, so temperature rise during continuous transmission is expected. Recommendations: ① Leave space around the module for heat dissipation; ② Avoid long periods of continuous full-power transmission; ③ Reserve copper pour or thermal vias on the PCB design.
Q3: How do I avoid damaging the module?
A: ① Power supply: Voltage must not exceed 5.5V, otherwise the module may be destroyed. ② ESD protection: Wear an anti-static wrist strap when handling. ③ Never leave the antenna port open during transmission — an antenna must be connected, otherwise the power amplifier can be damaged by excessive standing wave ratio (SWR).
Q4: How do I check the module's current parameters?
A: Send the AT command AT+INFO=? via serial port. The module will return complete information including model, firmware version, transmit power, operating frequency, PANID, air data rate, and more. This is a powerful diagnostic tool.
Q5: The routing table is empty. What's wrong?
A: The routing table is only populated after data exchange occurs in the network. If the module was just powered on or there's no network traffic, an empty routing table is normal. Let multiple modules exchange data first, then read the routing table again.
Q6: How do I configure a module remotely?
A: When sending remote configuration commands, the target port must be set to Port 14 (other ports don't support remote configuration). Refer to Chapter 7 of the user manual for specific command formats.
Q7: The module won't enter configuration mode. What should I do?
A: Pull the M0 pin low, then power on the module — it should enter configuration mode. If it still doesn't work, check the M0 pin voltage level and verify the serial connection is correct.
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