Solution to the problem of CAN to 4G conversion
1.4G网络连接失败
1.4G network connection failed
现象：模块无4G信号、显示离线；解决：检查SIM卡是否插紧、未欠费/未过期，重启模块；确认所在区域有4G覆盖，远离信号屏蔽处，必要时更换高质量SIM卡。
Phenomenon: The module has no 4G signal and the display is offline; Solution: Check if the SIM card is securely inserted, not overdue/expired, and restart the module; Confirm that there is 4G coverage in the area, stay away from signal blocking areas, and replace high-quality SIM cards if necessary.
2.CAN总线无数据传输
2. No data transmission on CAN bus
现象：4G正常，但CAN端收不到/发不出数据；解决：检查CAN线接线牢固（CAN-H/CAN-L勿接反），确认总线两端接120Ω终端电阻，匹配波特率与设备一致。
Phenomenon: 4G is normal, but CAN cannot receive/send data; Solution: Check that the CAN wiring is secure (CAN-H/CAN-L should not be reversed), confirm that the bus is connected to a 120 Ω terminal resistor at both ends, and match the baud rate with the device.
3.数据传输时有时无
3. Sometimes there is no data transmission available
现象：传输不稳定、频繁中断；解决：排查电磁干扰，用屏蔽电缆并做好接地，远离强电磁场；检查电源是否稳定，加装稳压器，优化CAN总线负载。
Phenomenon: Unstable transmission, frequent interruptions; Solution: Investigate electromagnetic interference, use shielded cables and ensure proper grounding, and stay away from strong electromagnetic fields; Check if the power supply is stable, install a voltage regulator, and optimize the CAN bus load.
4.模块频繁重启
4. Frequent module restarts
现象：模块反复断电重启，无法稳定运行；解决：检查电源电压波动，更换稳定电源；排查模块过热，避免密闭安装，清理散热通道，减少软件冲突（重启设备）。
Phenomenon: The module repeatedly loses power and restarts, unable to operate stably; Solution: Check for voltage fluctuations in the power supply and replace with a stable power supply; Check module overheating, avoid closed installation, clean heat dissipation channels, and reduce software conflicts (restart devices).
5.配置参数后无法生效
5. Unable to take effect after configuring parameters
现象：修改IP、网关等参数后，通信仍异常；解决：参数修改后重启模块，确认配置未被误删；核对参数与服务器一致，优先使用静态IP替代DHCP分配。
Phenomenon: Even after modifying parameters such as IP and gateway, communication still remains abnormal; Solution: After modifying the parameters, restart the module and confirm that the configuration has not been mistakenly deleted; Verify that the parameters are consistent with the server, and prioritize using static IP instead of DHCP allocation.
6.4G信号弱、网速慢
6.4G signal weak, slow internet speed
现象：信号格少、数据传输延迟高；解决：调整模块安装位置（朝向开阔处），加装4G增益天线；联系运营商确认网络是否拥堵、基站是否维护。
Phenomenon: Limited signal grid and high data transmission delay; Solution: Adjust the installation position of the module (facing towards an open area) and install a 4G gain antenna; Contact the operator to confirm if the network is congested and if the base station is maintained.
7.CAN接口通信报错
7. CAN interface communication error
现象：模块提示CAN通信故障、CRC错误；解决：检查CAN线是否破损、接触不良，排查ESD二极管等外围器件是否短路；用万用表检测总线阻抗。
Phenomenon: The module prompts CAN communication failure and CRC error; Solution: Check whether the CAN line is damaged or has poor contact, and investigate whether peripheral devices such as ESD diodes are short circuited; Use a multimeter to measure the bus impedance.
8.模块无法上电
8. The module cannot be powered on
现象：接通电源后，模块无指示灯、无反应；解决：检查电源接线是否正确、电源线是否完好；确认电源电压匹配模块额定电压，排查电源接口松动。
Phenomenon: After connecting the power supply, the module has no indicator light or response; Solution: Check if the power wiring is correct and if the power cord is intact; Confirm that the power supply voltage matches the rated voltage of the module and investigate if the power interface is loose.
9.远程无法访问模块
9. Remote access to modules is not possible
现象：4G正常，但远程电脑无法连接模块；解决：检查模块端口、端口映射是否正确，关闭防火墙拦截；确认服务器IP、端口未变更，重启远程访问软件。
Phenomenon: 4G is normal, but the remote computer cannot connect to the module; Solution: Check if the module ports and port mappings are correct, and disable firewall interception; Confirm that the server IP and port have not changed, restart the remote access software.
10.固件/软件运行异常
10. Abnormal firmware/software operation
现象：模块卡顿、配置界面无法访问；解决：升级模块至最新固件，清理缓存；排查软件冲突，重启设备，无法解决则联系厂家获取技术支持。
Phenomenon: Module lag, inability to access configuration interface; Solution: Upgrade the module to the latest firmware and clear the cache; Check software conflicts, restart the device, if unable to resolve, contact the manufacturer for technical support.
如果您的项目需要用到CAN转4G设备，可以加微信13019325660或前往沈阳广成科技官网进行具体咨询。
If your project requires CAN to 4G devices, you can add WeChat 13019325660 or visit the official website of Shenyang Guangcheng Technology for specific consultation.
