The SA-SSI includes the same hardware as a basic SA380TX, that is 10 digital inputs, RS485 and a GSM modem.
Like the SA380TX up to two expansion cards can be added; these cards may either add an additional 4 analogue or 8 digital inputs.
The fundamental difference between an SA-SSI and an SA380TX is the type of system that they are capable of monitoring.
The purpose of an SA-SSI is to monitor Solid State Interlockings through utilisation of its front USB port.
Further information regarding:
- Block diagram and Isolation Policy
- Power supply
- Digital inputs
- Analogue cards
Can be found here: SA380TX Hardware