Simple Sensor Interface (SSI) Protocol

Simple Sensor Interface (SSI) Protocol intended to be used to transfer data between sensor unit(s) and a terminal. SSI is related to Internet of Things. Possibly the linked previously published articles will be interesting to many readers – Protocols Related to Internet of Things (IoT), Sensor, Wireless Sensor Network, Actuator. Simple Sensor Interface (SSI) Protocol is an Application layer protocol in the OSI model. As for example, two alternative ways of using the SSI protocol are with and unction with point-to-point (UART) and networking (nanoIP) applications. In point-to-point, the SSI protocol operates over a serial link (UART) connection. This can be physical (wired) or virtual wireless Bluetooth serial port. The SSI protocol also has the capability to be used over layer 3 networking protocols such as TCP/IP or nanoIP.

 

Basics on Simple Sensor Interface (SSI) Protocol

 

The wireless sensor units are intended to be operated over a long period with small battery resource. Thus the SSI protocol is not too complex. The following configurations can be identified:

1. The terminal can be connected into one or more sensor units through the SSI protocol
2. There may be one or more sensor boards behind one communications link
3. There may be one or more sensors on the sensor board

Within the reference environment the SSI protocol and the application program (client) operating on the Symbian OS must be able to:

1. Find sensor devices
2. Read data from sensor devices
3. Send data to sensor devices

In the reference environment below sensor data is monitored over the Bluetooth virtual serial port connection. As a terminal any defined Open Source OS based mobile phone can be used to monitor sensor data on the sensor boards. The mobile terminal can operate also as a gateway to obtain Internet connectivity. The wireless link between the server (sensor unit) and the client (terminal) can be – Bluetooth, BTLEE (Bluetooth Low End Extension), UWB or any proprietary radio system.

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