Pacific Scientific PC834-001-T Thermocouple input module

Detailed

Pacific Scientific PC834-001-T Thermocouple input module

Analog inputs from connectors PC834-001-T. are routed through low pass Input Filters and OP AMP Buffers to the input multiplexers shown in Figure 1-2 on page 25. Channels 00 to 31 are connected through P4 and Channels 32 to 63 are connected through P3. To provide at least one ground in each of the input connectors, the LOW inputs for Channels 31 and 63 can be jumpered individually to AGND, or can be left ungrounded (see the “Configuration and Installation” section of this Manual). AGND is the internal analog ground. The center row (B row) pins on connectors P3 and P4 are tied to AGND. This provides a return for all channels if 96-wire ribbon cables are used for the analog inputs.

Autoscan - Selected by clearing both scan mode control bits in the CCR and is the default selection after a reset operation. All active channels are scanned continuously in this mode. 

Single Scan - Selected by clearing scan mode control bit 7 and setting bit 6. All active channels are scanned through once, and the scan process is stopped until the next trigger event. 

Random Access - Selected by setting bit 7 and letting bit 6 be a Don’t Care. In this mode, a channel is selected by entering the channel number in bits D05-D00 in the CCR. This desired channel is sampled, digitized and stored at RAM offset address $0080.

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