(1) A MICROPROCESSOR-BASED CAMAC ISOLATED DIGITAL OUTPUT MODULE*
J. Kieffer · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1982
This paper describes a 32-channel digital output module, and the development of the hardware and software design. The microprocessor-based design allows versatility in output control in response to CAMAC commands. The unit may be tailored to different specific applications by modification of the internal applications software. CAMAC commands, which may be stacked for serial micro-processing, allow outputs to be selectively DC or pulse controlled, and to control other outputs at the start or end of a pulsed output. output pulse width may be pre-defined, or set within a range of values. Various outputs may be responding to any of the above commands concurrently. outputs to be pulsed (on or off) may be preset with width and trigger options, with execution deferred. Action may be later initiated on a set of channels using a selective pulse command to initiate execution of the preset sequences. The unit is a single width CAMAC module. Intended for general use as an equipment controller, each output is rated for switching loads of up to 75 volts and 100 milliamperes. DEVELOPMENT The Isolated Digital Output Module (IDOM) is a microprocessor-based CAMAC module. The IDOM was designed for use by the Stanford Linear Collider project (SLC) at the Stanford Linear Accelerator Center (SLAC). The ability to preload and then initiate the execution of a sequence of variable width output pulses, makes this module useful as a process control sequencer. The outputs are arranged in two groups of sixteen, each group being brought out from the module through a 36-pin front panel connector (see Figure 1).