Chapter 2. Overview

The Minimus 8-channel I/O Expander Module, part number MIN-EXP-08IO, is a peripheral unit that can be connected to the Güralp Minimus digitiser. It provides eight independent single-pole, double-throw relay outputs that can be used to initiate external actions (such as closing a valve or sounding an alarm) in response to a seismic event which satisfies certain predefined conditions.

The unit connects over an RS232-compatible serial link to the Minimus’ Analogue Input, either:

• via a ‘Y’ cable, part number CAS-MIN-0007, which allows simultaneous connection of an analogue instrument, such as a Güralp Fortis; or

• via a dedicated cable, part-number CAS-MIN-0006, which should be used when no analogue instrument input is required.

Connections to external equipment are made via convenient plug-in terminal blocks with screw-type connections.

The I/O Expander Module does not require an external power supply when connected to the Minimus.