The CAMAC Standard was introduced in 1969 by the European Standards on
Nuclear Electronics (ESONE) Committee. The full details of the standard are
given in a document published by the ESONE Committee, and can be found
elsewhere 
. Only a brief discussion of the mechanical
and electrical signal standards is given here.
Mechanically, the CAMAC crate is 19 inches in width and equipped with 25 connector slots to accomodate modules. Each single width CAMAC module is 221.5 mm in height, 305 mm in depth, and 17 mm in width, exactly half the width of the standard NIM module. It is also possible to have multi-slot CAMAC modules.
The CAMAC system must also follow satisfy specific electrical standards for the
digital signals passed along the dataway. TTL logic signals are used, the
signal levels of which are given in table 
.
Table 1:
Dataway signal level requirements for TTL logic signals.