Ebyte E90-DTU User Manual page 15

Chengdu Ebyte Electronic Technology Co., Ltd.
(a) Communication mode: After power-on, the DTU works in communication mode by default, and automatically
starts the network connection. When the connection is established with the server, any data received by the DTU
will be transparently transmitted to the server. At the same time, it can also receive data from the server. After
receiving the data from server, the DTU will directly send data out through the RF side. The maximum length of
single packet data supported by the DTU is 1K bytes. When two links are connected to the server at the same time,
the data will be sent to two links, once there is data sending from any link, the DTU will transparently transmit the
data.
(b) 4G/2G network configuration mode: Users can configure the 4G/2G network transparent transmission
parameters in this mode.
(c) RF configuration mode: Users can configure the RF parameters in this mode.
(d) Mode switching: The E90-DTU(900SL22-4G) configuration software is used for mode switching and
parameter setting. Please note that when entering the configuration state, the system is in the configuration mode. At
this time, click the "Module Restart" button or the "Enter Communication" button, the system will switch to the
communication mode; when entering the configuration state, if the USB cable is unplugged, the system will also
automatically switch to communication mode. If you do not click the "Save Parameter" button in advance, or have
modified the 4G/2G network transparent transmission parameters but did not click the "Module Restart" button, the
modified parameters will not take effect.
2. Query SIM card ICCID
Users can use the E90-DTU(900SL22-4G) configuration software. In the 4G/2G network transparent transmission
configuration mode, click the "Query SIM card ICCID" button to get the ICCID of the SIM card which is inserted
into the DTU.
3. Base station locating function
The E90-DTU(900SL22-4G) supports the base station locating function. Users can use the E90-DTU(900SL22-4G)
configuration software, in the 4G/2G network transparent transmission configuration mode, click the "Query LBS
Information" button to read the current LBS information of the device.
4. Query the signal strength of the network device to the base station
Users can use the E90-DTU(900SL22-4G) configuration software. In the 4G/2G network transparent transmission
configuration mode, click the "Query Signal Strength" button to get the current signal strength information.
5. Protocol transmission
The device supports two Socket links. Each socket can be configured as TCP Client or UDP Client. When
sending data, user can use protocol transmission or transparent transmission. In the protocol mode, the maximum
single packet size is 1024 bytes.
Protocol transmission format (It is needed to be in protocol transmission mode):
Send: 0x55 0xFE 0xAA ID Data
E.g.: 55 FE AA 00 AA BB CC
Receive: 0xAA 0XFE 0x55 ID data length(two bytes) data
E.g.: AA FE 55 00 00 03 11 22 33
user data
Example:
Take SOCK0 as an example:
Copyright ©2012–2019,成都亿佰特电子科技有限公司
// 00: SOCK0 link, AA BB CC: user data
// AA FE 55: fixed packet head, 00: SOCK0 link, 00 03: data length, 11 22 33:
E90-DTU(900SL22-4G)Usermanual
14