Chengdu Ebyte Electronic Technology Co.,Ltd E840-TTL(4G-02)User Manual
Copyright
©
2012
–
2019
，
Chengdu Ebyte Electronic Technology Co.,Ltd
6
4
LIKB
The SocketB link connection status indicator pin corresponds to the onboard left 2
LED.
High: SocketB is successfully connected to the web server;
Low: SocketB did not successfully connect to the network server;
5
DATA
The data TX and RX indication pin, when the network receives the data or the serial port
receives the data (50ms high/10ms low), corresponding to the onboard left 3LED light.
6
STAT
The device status indication pin corresponds to the onboard left 4 LED.
Low: The device is powered on to search for SIM card
1800ms low, 200ms high: the device checks the correct SIM card and is attaching to the
network;
High: The device is attached to the network successfully.
7
RXD
Data receiving pin, default 3.3V, compatible with 5V communication level.
8
TXD
Data transmitting pin, default 3.3V, compatible with 5V communication level.
9
VEF
Drive level power supply pin, if you need to achieve serial communication and LED indication
is 5V drive level, you need to input 5V level on this pin.
10
、
11
、
14
、
15
、
23
MOD
、
SLE
、
PA11
、
PA10
、
EN
NC
12
4V2
Lithium battery power supply pin, power supply range: 3.8V~4.3V. This pin is prohibited from
being reversed and is not allowed to be supplied with VCC.
16
VCC
DC power supply pin, power supply range: 5V~20V. This pin is prohibited from being reversed
and is not allowed to be supplied with VCC.
19
VD
External SIM card power supply pin, if the onboard SIM card holder is used, the pin remains
NC
20
RS
External SIM card reset pin, if the onboard SIM card holder is used, the pin remains NC
21
DA
External SIM card data pin, if the onboard SIM card holder is used, the pin remains NC
22
CL
External SIM card clock pin, if the onboard SIM card holder is used, the pin remains NC
24
LIKD
SocketD link connection status indicator pin, corresponding to the onboard right 3
LED.
High: SocketD is successfully connected to the web server;
Low: SocketD did not successfully connect to the network server;
25
LIKC
SocketC link connection status indicator pin, corresponding to the onboard right 2
LED.
High: SocketC is successfully connected to the web server;
Low: SocketC did not successfully connect to the network server;
13
、
17
、
18
GND
Ground
2. Quick start
2.1 Hardware
Hardware for test are as follows
：
