Chengdu Ebyte Electronic Technology Co., Ltd.
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E18-TBH-27 user manual v1.0
该版权及产品最终解释权归成都亿佰特电子科技有限公司所有
第
3
页，共 4 页
2
、
Instructions for use
Serial number description
：
①
Serial TXD selection port (P1.4)
②
Serial port RXD selection port (P1.5)
③
External 5V power supply port
④
External 3.3V power supply port
⑤
Module running indicator
⑥
Networking indicator
⑦
Power Indicator
⑧
RLED selection port (P1.3)
⑨
NLED selection port (P1.2)
⑩
Mode selection port (P1.6)
⑪
SOC selection port (chip VCC)
⑫
Baud rate reset button
⑬
reset button
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.