TRICONEX 4409S Channel contact module

The data buffer contains from 1 to 64 data blocks, and is located at board address $0080. The size of the buffer is controlled by the Buffer Configuration Control bits D11 to D15 in the CCR. The buffer can be adjusted from 16 to 1,024 data words in six binary increments. A single update of all locations in the buffer is a data scan, and is executed at the user-defined sampling rate or the 100 kHz default rate. Data blocks within the buffer are organized with the first block located at the lowest word address in the buffer, and with the data word in the last block located at the highest address. Total on-board RAM size is 2048 words. Memory locations $0880 through $0FFE may be used as scratch pad memory. Also, data buffer memory not used for storage of scanning input data may be used as on-board scratch pad memory.

Gain Selection 

A fixed channel gain of x1 or x10 can be software programmable for all channels, or can be assigned individually for each channel. The automatic gain mode provides program control of the gain of each channel. For automatic gain control, a gain code for each channel is loaded into gain RAM. The gain is used as each channel is selected and digitized.

Operating Modes 

The VMIVME-3122 Board can be programmed to scan the input channels continuously, to read input channels individually, or to acquire data in timed or synchronized bursts. Table 3-8 on page 54 ‘Scan Mode Configuration’ summarizes the various operating modes, all of which are described in this section. The default settings assume a 64 channel option. If a 32- or 16-channel option is used, substitute 32 or 16 wherever 64 channels is mentioned.

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