Shandong USR IOT Technology Limited USRGM3 用户手册
USR-GM3/GM3s User Manual
Jinan USR IOT Technology Limited
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tec@usr.cn
4.3.
4.3.
4.3.
4.3. Heart
Heart
Heart
Heart Beat
Beat
Beat
Beat Package
Package
Package
Package
4.3.1.
4.3.1.
4.3.1.
4.3.1.Description
Description
Description
Description
Under network transmission mode, customers can send Heart Beat Package to network server
or serial device.
Sending heart beat data to network server, is used to check if connection is alive. If GM3 sends
data unsuccessful for 3 times, it will try to reconnect to server.
Sending heart beat data to serial device , is usually used to query information from serial device
instead of sending query command from server, To do this can cut some communication flow.
or serial device.
Sending heart beat data to network server, is used to check if connection is alive. If GM3 sends
data unsuccessful for 3 times, it will try to reconnect to server.
Sending heart beat data to serial device , is usually used to query information from serial device
instead of sending query command from server, To do this can cut some communication flow.
4.3.2.
4.3.2.
4.3.2.
4.3.2.Usage
Usage
Usage
Usage
1.
Enable sending heart beat package.
2.
Set the destination of heart beat package data. for instance, to network server.
3.
Set heart beat data, for instance, set data as string “www.usr.cn”, customer need to convert
it to hex string “7777772E7573722E636E”.
it to hex string “7777772E7573722E636E”.
4.
Set sending period, for instance, 30 seconds.