In a data communication system, data is transmitted from a control device to a
communication interface and from there via a communication bus to additional communication
interfaces of trigger devices. The communication interface on the control device
side has inputs, to which signals from said control device and a disarming switch
can be assigned. The disarming switch can be circumvented by a bypass switch which
is controlled by the control device. The state of the signal at the inputs of the
communication interface on the control device side is transmitted to coresponding
outputs of the communication interfaces of the triggger devices. A trigger device
has a safety unit which is used to test at least one trigger unit, when the state
of the signal of the outputs authorizes such a test and the trigger voltage source
is not yet charged wth the full trigger voltage. In said state, the safety unit
also blocks triggering as soon as the trigger voltage has been reached. The inventive
system ensures a high degree of functional safety and flexibility.
