When selecting forward and reverse modules in harsh environments, multiple factors need to be considered comprehensively. Firstly, it is necessary to ensure that the module has a good level of protection and can effectively resist the invasion of dust, water vapor, corrosive substances, etc. For example, choose modules with a protection level of IP65 or higher.

Secondly, the working temperature range of the module should be wide and able to operate stably in extreme environments of high or low temperatures.

Furthermore, the material of the module should have the characteristics of wear resistance, impact resistance, and vibration resistance to cope with the physical effects in harsh environments.

In addition, attention should be paid to the electrical performance stability of the module, such as strong resistance to electromagnetic interference, to ensure normal operation in complex electromagnetic environments.

Finally, the reliability of the brand and product, as well as after-sales service, are also important considerations. Some well-known brands usually have more assurance in quality control and technical support. Could you please explain in detail the specific characteristics of the harsh environment to me again? For example, is it high temperature and humidity, strong electromagnetic interference, or other special circumstances?