The Model 920E provides the following functions:
- High-speed multiplexer/router with 16 inputs
- 4k-channel, successive-approximation ADC, with fixed conversion time of <15 µs; memory divisible into 1, 2, 4, 8, or 16 segments; memory size selectable as 1024, 2048, 4096, or 16,384 channels. Connection between physical input and memory segment allocated under software control (“dynamic routing”).
- Nonvolatile memory; 16k channels, 231–1 counts per channel
The 920E is readily connected into an Ethernet environment. It may be integrated easily into existing networks. Control and spectral display is achieved by using a suitable ORTEC CONNECTIONS applications package such as MAESTRO, AlphaVision, or Renaissance.
The 920E employs a dual Direct Memory Access (DMA) architecture to maximize system throughput. The unique “dynamic routing” feature allows any one, or any group of inputs to be routed to any memory segment. This has many applications in areas as diverse as whole-body counting and fuel-pin scanning.
The communications protocol used by the 920E is the “traditional” NIM digital bus NIM/4881
per DOE/ER-0457T (formerly NIM-GPIB) protocol used for several years in all ORTEC MCB products.2
For the “Do it yourself” programmer, software toolkits are available to simplify the task of making a user-written application communicate with the Model 920E.
Please refer to “Standard NIM Digital Bus (NIM/488),” DOE/ER-0457T, U.S. NIM committee, May 1990; Standard NIM Instrumentation System, NTIS, U.S. Department of Commerce, Springfield, Virginia 22161.
The 920E also provides the ORTEC Dual-Port Memory connector on the rear panel. DPM communications are still supported by ORTEC applications packages for historical reasons, but Ethernet communications are recommended in most cases, for convenience (especially over large distances) and for ease and reduced cost of implementation. An RS-232-C port is also provided for diagnostic purposes.