Abstract: The housing for sensitive instruments, with an inlet and an outlet for cool air as well as a device for circulating the cool air, is divided into a first chamber and a second chamber, which is hermetically sealed from the first chamber. A cooling unit is disposed in the housing. Separate air streams are circulated in the two chambers, both air streams being sealed hermetically from one another. The first air stream is circulated in a closed cycle and cooled at a first heat exchanger of the cooling unit. The second air stream cools a second heat exchanger of the cooling unit, which is in the second chamber, and flows through the outlet into the surroundings.

Abstract: A control system is proposed which is integrated in a single housing and is designed for a numerically controlled machine. The control system comprises a PC board which includes an input device, a processor, a memory, and a PC bus; a plurality of CNC boards, each including a processor, a memory, and a CNC bus; a common control-system bus connected to the CNC bus of each CNC board; and a PC matching circuit provided between the control-system bus and the PC bus. The matching circuit includes a read-write memory, an address multiplexer, a bidirectional data multiplexer, and a control circuit, which depending on the control signals on the control lines of the control-system bus and the PC bus, drives the address multiplexer, the bi-directional data multiplexer, and the read-write memory such that by the control-system bus and also by the PC bus, data can be written into and read out from the read-write memory under desired addresses.