核物理实验中的多参数数据获取系统

CAMAC Data Acquisition System Based on Micro VAX Ⅱ

本文介绍了基于ＭｉｃｒｏＶＡＸⅡ计算机的ＣＡＭＡＣ多参数数据获取系统，最多能进行２５６个参数的数据获取，可实现硬件排零，具有较高的计数率。硬件主要有三个部分组成：逻辑控制电路、ＣＡＭＡＣ读出系统、计算机系统。系统实时获取时，可在线处理和分析数据并在图形终端Ｔｅｋｔｒｏｎ－ｉｘ４０１４上显示谱。

The CAMAC data acpuisition system based onMicro VAX Ⅱ computer has been set up inInstitute of Modern Physics. The system provides high-speed , zeto-suppressed,and 256 pa-rameter CAMAC acquisition. It consists of three parts : control logic unit,CAMAC readout sys-tem and host computer system. When the control logic unit is triggered off by an external elec-tronic selection signal , it produces a pilot signal to keep all of the parameters of a particularevent fogether. Event mode data have been collected by using a CAMAC Fast Crate controllerwhich contains two FIFO(First In First Out)memory buffets.When memory buffer is full,the CAMAC Readout system Passes the data to the computer's memory in direct-memlory-access(DMA)mode by interface DRV11 which is desigied for Q-Bus by DEC.The host computer system, in hard environment, is equipped with certain peripheral de-vice. It includes the following:1.at least two M990 GCR , 6250B/inch,magnetic tape driveroperating at 75 inches per second or faster.2. a Tektronix 40l4 storage scope.3.a laser print-er, LND3-AE or copier which is capable of making hard copies of Tektronix 4014 screen.4.a control console device and a line printer.The optional devices:5.x-press color graphics terminal.6.DEC networ.When the system is in real-time acquisition, it is able, on-line,to handle and analyse datastream, to monitor and control experiment and to display dynamically spectra on the Tektronix4014.(