General Functions
To configure the serial port packet settings of the device:
- DTU
- General Settings
Registry Packet
Click Registry Packet under the Configurations tab.
The Registry Packet is designed to allow the server to identify which device is sending the data or to use the packet as an authentication token for server-side functions. The registry packet can be sent when the module establishes a connection with the server or added as a prefix to each data packet.
Registry packet data can be based on ICCID, IMEI, or user-defined values. This information helps the server uniquely identify the device and enables access control for specific functions.
| Parameter | Description | Default Value |
|---|---|---|
| Enable | ON / OFF | OFF |
| Type | IMEI, ICCID, User-Defined | User-Defined |
| User-Defined Packet | A–F, a–f, 0–9, hex data, even bit | 0123456789 |
| Registry packet contained in | After connection: The registry packet is sent once when the device connects to the server. | After connection |
Note: The Registry Packet function is only applicable in TCPC and UDPC modes.
Heartbeat Packet
Click Heartbeat Packet under the Configurations tab.
The heartbeat packet can be sent to the network or serial device. By default, RLTK421 sends heartbeat packets to the network to maintain a stable and reliable connection.
| Parameter | Description | Default Value |
|---|---|---|
| Enable | ON / OFF | OFF |
| Type | Serial heartbeat packet / Network heartbeat packet | Network heartbeat packet |
| User-defined packet | A–F, a–f, 0–9, hex data, even bit | 0123456789 |
| Heartbeat interval (s) | 1–6000 seconds | 3 |
Note: The Heartbeat Packet function is only applicable in NET/MODBUS modes.
Restart Without Data Loss
Click Protocol Format Select under the Configurations tab.
This function is disabled by default. When enabled, the device actively disconnects and reconnects the socket connection if no data is received from the network within the configured reconnection detection interval. This helps prevent fake connections caused by abnormal socket sessions.
When the restart detection interval is reached, the device automatically restarts and re-establishes the connection, helping maintain system stability and connection reliability.
- After configuring the parameters, reboot the device for the settings to take effect.
- This function is only available in NET/MODBUS modes.