Modular data acquisition system

In a modular data acquisition system ( 4 ), a module comprises at least one analog-to-digital converter ( 12 ) for converting an analog input signal (IN1, IN2, IN3, IN4) into a digital signal (OUT1, OUT2, OUT3, OUT4), and a clock generating circuit ( 20 ) for supplying an internal clock signal ( 209 ). The module further comprises a connector for plugging in a removable connecting element ( 3 ) on the front side of the module ( 1 ) in order to connect it to a synchronization bus connecting several modules in said system. A clock selecting circuit ( 204 ) enables the selection of either a slave-clock status, wherein the converters ( 12 ) are synchronized by an external synchronization signal supplied by said synchronization bus, or of a master-clock status, wherein the converters are synchronized by said internal clock signal which is also used a external synchronization signal on said synchronization bus. Trigger signals can also be transmitted by the synchronization bus and by the connecting elements.