SunTech ST4940 - Page 22

Doc. Title
ST4940 User Manual
Concerning:
Rev.
Date (dd-mm-yy)
Page of Pages
Features and how to configure ST4940
1.07
0
1-7-2019
22 of 52
3 : ACK when the server receives ‘emergency report’.
Command response does not need ACK.
DEV_PORT
String
Device’s port for receiving command from UDP server
It can be used only when UDP server is used.
If ‘0’ or empty, the device would use port 9000.
If not zero, the device can receive commands on port
DEV_PORT.
Reserved
‘0’
Reserved
‘0’
Reserved
‘0’
Reserved
‘0’
Reserved
‘0’
Reserved
‘0’
<Example>
[command]
ST600ADP;0123456789;02;T;T;0;;0;0;0;0;0;0
[response]
ST600ADP;Res;0123456789;309;T;T;0;;0;0;0;0;0;0
<ACK in case of UDP>
UDP is a protocol which does not check if the data has been transmitted successfully. So, the device checks completion
of sending with ACKdepending on UDP_ACK type.
ACK is sent by the server when the data is received.
If the ACK is not sent for more than 2 minutes after sending, the device recognizes that the data has not reached the
server and sends the data again.
Examples of ACK report are as below.
String Format : “ST600ACK;0123456789”
Device users are recommended to set ACK_TYPE to ‘1’ to confirm that all the data can be transmitted successfully.
Report Type
UDP_ACK=0
UDP_ACK=1
UDP_ACK=2
UDP_ACK=3
Alive
X
X
X
X