Rievtech EXM-12DC-DA-R-HMI, User Manual, Page: 25 / 443

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the device name and the IP address will displayed.
Step8: After the connection is established successfully, Program download/upload and data remote
monitoring can be realized in a wireless way all over the world.
Application:
1.x-Messenger is client with a dynamic IP address,(SIM card)
2.Server software ( With a static IP address)
Option A:
The server software can ask for some information such as temperature(analog inputs), level (digital inputs)
from the remote station, also it can remotely control items such as a valve with a standard command
(MODBUS TCP command). We are not supplying server software,
which is available from other sources . This is
only to use the GPRS function.
The data transmission after the GPRS connection has been established, the communication protocol is
achieved using standard Modbus TCP. For the detailed information about the modbus protocol and memory
map/ register addresses of x-Messenger, please read the "Modbus TCP communication protocol" from our
side/website.
You can use our free of charge SCADA(easyScada) to communicate with EXM by GPRS(You can refer to the
SCADA user instruction about how to make the connection).
Option B:
x-Messenger can upload the digital inputs/outputs, analog inputs to the server(User can make their own
server software based on the modbus tcp protocol, or use our free of charge easyScada). There are 2 GPRS
function blocks available. Please see the chapter 7.2.14 &7.2.15 for a detailed description.