Most of the metal keypads are made from stainless aluminium or steel. They are designed in a way that they comply with the safety standards also. Some even come with a tactile sensation so that the physically handicapped people can also use them. Apart from these, these can also be customized to meet any other requirements as well. These are apt for indoor as well as outdoor applications.
A metal keypad can have a key switch lifetime of as high as five million operations. Also, the lettering done is mostly laser engraved which gives it further durability. These can be made to function from -10 degree Celsius to +60 degree Celsius. Many can even work over a much broader range. Many come with an inbuilt tamper switch. Other major feature of metal keypads is that they come with multiple termination and cabling options.
Serial communications are widely used to in industrial automations. Devices like sensors, computers, data loggers etc. can be connected using the serial communications. However, the simple serial communications have several limitations. Some of them are distance, speed, accessibility etc. All these limitations have led to a need for using the serial over Ethernet communications.
Most of the serial based devices can be easily integrated with the Ethernet protocols. In addition to the ease of integration, minimum requirement of processing power and reliability of the connectors further helps to favor these serial over Ethernet communications.
