Datamatics Software Services Limited, a domestic subsidiary of Datamatics Global Services Ltd, an IT and KPO organisation, on Thursday signed a definitive agreement to acquire a controlling stake in Vista Infosystems Private Limited, which specialises in embedded systems space. Bangalore based Vista Infosystems caters to delivery centres of companies like Honeywell, Samsung, Philips, Visteon, etc and has domain competencies in market segments like automotive, aerospace, telecom and semiconductors.