Ebyte E840-DTU User Manual page 19

4G/LTE Serial Server
configure
transmit：AT+ HEARTM =<time><CR>
return：<CR><LF>+OK<CR><LF>
Parameters: time heartbeat time, 0 off, range 1 to 65535 seconds.AT+SHORTM
Function： set/inquire short connection time
Format： inquire
transmit：AT+ SHORTM<CR>
return：<CR><LF>+OK=<time><CR><LF>
configure
transmit：AT+ SHORTM=<time><CR>
return：<CR><LF>+OK<CR><LF>
parameter： time short connection time， 0 off，from 2-255 second
AT+EBTIOT
Function： set /inquire EBYTE IoT Cloud platform
Format： inquire
transmit：AT+EBTIOT <CR>
return：<CR><LF>+OK=<ctrl><CR><LF>
configure
transmit：AT+EBTIOT =<ctrl><CR>
return：<CR><LF>+OK<CR><LF>
parameter： ctrl EBYTE IoT function switch，0 off/1 on
Note: After the IoT cloud function is enabled, the module is automatically connected to the Yiyi special IoT platform, ignoring the sock configuration,
registration package, and heartbeat package function.AT+CSQ
Function： inquire signal strength
Format： configure
transmit AT+CSQ<CR><LF>
return <CR><LF>+OK=<csq><CR><LF>
parameter： csq signal strength
description：none
AT+CREG
Function： inquire whether it is registered with the carrier.
Format： configure
transmit AT+CREG<CR><LF>
return <CR><LF>+OK=<creg><CR><LF>
Parameter： creg
1
0
Description： None
AT+CPIN
Function： inquire SIM card status
Format： configure
transmit AT+CPIN<CR><LF>
return <CR><LF>+OK=<cpin><CR><LF>
Parameter： cpin
1
0
Description： None
AT+ POTOCOL
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co. LTD.
18
Register to the network
not registered to the network1
Able to detect SIM card
unable to detect SIM card
E840-DTU（4G-01）User Manual