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E18-TBH-27 user manual v1.0
2、Instructions for use
Serial number description：
Serial TXD selection port (P1.4)
①
External 5V power supply port
③
Module running indicator
⑤
Power Indicator
⑦
NLED selection port (P1.2)
⑨
SOC selection port (chip VCC)
⑪
reset button
⑬
Function Description：
1. Reset button: system reset
2. Baud rate reset button: Double click reset baud rate (default 115200) (P1.7)
3.TXD, RXD selection port: can be connected to external serial port
4. Mode selection port: Used to switch between AT command mode and HEX command mode. Plug in the
jumper cap, indicated as HEX command mode (low level), no jumper cap is indicated as AT command
mode (high level) (P1.6)
5. Ports ①, ②、③、④、⑧、⑨、⑩ and ⑪ are used together to test the module current: ①、②、③、
④、⑧、⑨、⑩, ⑪ ports are not plugged in wire jumper Cap. The ammeter meter pen contacts 11 ports
(above: left and right negative), can test the chip current.
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Chengdu Ebyte Electronic Technology Co., Ltd.
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Serial port RXD selection port (P1.5)
②
External 3.3V power supply port
④
Networking indicator
⑥
RLED selection port (P1.3)
⑧
Mode selection port (P1.6)
⑩
Baud rate reset button
⑫
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