Omega 308, DAQP-208, 208H user manual Scan List Queue Programming

5.2.2.1 Scan List Queue Programming

The scan list queue must be programmed when the A/D circuit card is idle. Each queue entry contains two bytes as described above and the integrity of the entry must be guaranteed. (The scan list queue is write only). The queue should be flushed before writing into it. Refer to the Auxiliary Control Register section for information on scan list queue reset. The first entry of the queue should have bit 7 (LSB) set to “1” as the first channel mark. For the remaining entries, set the bit to “0”. The synchronous sample hold bit (LSB) is not used by DAQP card and is reserved for expansion cards that support synchronous sample hold.

Example 1

Table 5-10 lists the required queue entries to specify a scan list of three single-ended internal channels: 0, 12, and 7; with a gain of 2 for channel 0 and a gain of 4 for channels 12 and 7:

Table 5-10. Scan List Queue Programming Example 1

Entry	Binary	Hex	Explanation
1	0001 0000 1000 0000	1080	Select channel 0, gain 2, 1st entry
2	0010 1100 0000 0000	2C00	entry
			Select channel 12, gain 4
3	0010 0111 0000 0000	2700	Select channel 7, gain 4

Example 2

Table 5-10 lists the required queue entries to specify a scan list of 4 differential internal channels: 2, 1, 6 and 7; with gain of 1 for all channels:

Table 5-11. Scan List Queue Programming Example 2

Entry	Binary	Hex	Explanation
1	0100 0010 1000 0000	4280	Select channel 2, gain 1, 1st entry
2	0100 0001 0000 0000	4100	Select channel 1, gain 1
3	0100 0110 0000 0000	4600	Select channel 6, gain 1
4	0100 0111 0000 0000	4700	Select channel 7, gain 1

DAQP-208/208H/308 Users Manual 44