LeCroy's CAMAC Model 2301 qVt Interface has been designed to allow spectrum transfer to computer or to allow data transfer to the Model 3001 Multichannel An- alyzer for display or histogramming. The Model 2301 allows the qVt to be used for calibration and setup as well as for display during the operation of an experiment.
The 3001 may be used to set gain and timing of hodoscope or calorimeter ele- ments. When the first order high voltage and cable delay parameters are set, the information may be transferred to the computer for straightforward analysis before the systems software is fully operational. In this way, an array of gains and timing parameters may be evaluated for second order corrections.
Just as in many commonly-used minicomputers, data in the 3001 is organized into 16-bit words. The Model 2301 allows this memory to be written into from the CAMAC Dataway. The data loaded into memory is then automatically displayed without the need for expensive storage display or the requisite CPU time required to refresh a standard CRT.
An increment feature allows any channel of the 3001 to be incremented by 1. This feature allows use of the analyzer as a histogram and display module without significant core usage for data storage or software. Since the display is continu- ously active, the experimenter may watch the spectrum accumulate without signi- ficant CPU overhead.
The Model 2301 contains an Incrementing Address Register which maybe loaded from the CAMAC Dataway. The value contained in the register is used to address memory for both read and write operations. After the read or write operation is per- formed, the register is incremented by 1. Using this scheme, data may be trans- ferred to or from the qVt memory at the rate of 1 word per CAMAC cycle.
SPECIFICATIONS
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Inputs and Outputs: |
44 on a single front panel edge connector. Pin-for-pin identical to the qVt rear I/0 connector. Mates with AMP connector 582777-1. |
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LAM Button: |
A front-panel pushbutton sets the L level to true. Intended to allow a manual interrupt. |
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CAMAC Commands: |
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Q: |
A Q = 1 response is generated in recognition of an F(2), F(16), F(17), or F(25) command only it a valid address (O to 1023) is contained in the Internal Address Register. A Q = 0 response applies for all other function codes. |
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X: |
An X 1 (Command Accepted) is generated when a valid F and N is received. |
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L: |
An L 1 Look-At-Me signal is generated by pressing the front-panel LAM Button. The condition persists until an F(2) is received. |
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CAMAC Function Protocol: |
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F(2) |
Read qVt data. Requires N, Sl and S2. Loads qVt data from the channel whose address is in the Incrementing Address Register to Dataway lines Rl to R16. Advances the Incrementing Address Register by one. |
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F(9) |
Clear qVt. Requires N, Sl and S2; clears all 1024 memory locations in the qVt. |
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F(16) |
Write into qVt. Requires N, Sl and S2. The data contained on the Data- way lines Wl to W16 are written into the memory channels whose address is in the Incrementing Address Register. Advances the Incrementing Address Register by one. |
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F(17) |
Write into Incrementing Address Register. Requires N, Sl and S2. The data contained on the Dataway lines Wl to W10 are written into the Incre- menting Address Register. |
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F(24) |
Stop qVt. Requires N, Sl and S2. Issues a STOP command to the qVt. |
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F(25) |
Increment qVt. The data in the address contained in the Incrementing Address Register is incremented by 1. |
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F(26) |
Start qVt. Requires N, Sl, and S2. Issues a START command to the qVt. |
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Packaging: |
In conformance with CAMAC standard for nuclear modules (ESONE Com- mittee Report EUR4100e). RF shielded CAMAC #1 module. |
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Current Requirements: |
+6 V at 500 mA. |