National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Instrukcja Użytkownika Pobierz pdf (Strona 33)

NI 9213 Conversion Speed Control

The NI 9213 converts at two pre-defined rates, as controlled by the speed

control field.

Note The conversion rate assumes that 18 channels are in the scan list.

NI 9213 Common Mode Error/Status

The error/status field is shown in Table 22.

NI 9213 Scan List

The scan list contains channels to convert, in order. The NI 9213 has

eighteen measurable channels:

• 0..15: Sixteen thermocouple channels (always measured in a ±78 mV

range)

• 16: One cold junction channel (always measured in a ±2.5 V range)

• 17: One auto zero channel (always measured in a ±78 mV range)

Table 21. NI 9213 Conversion Speed Control

Speed Control Meaning Conversion

2 (0x02) High-Accuracy 55 ms/channel (.99 s total)

15 (0x0F) High-Speed 740 μs/channel (13.32 ms total)

Table 22. NI 9213 Error Status Field

Bits Field

31:8 Reserved

7 OT Error:

1= Open thermocouple was detected on the

last channel that was acquired

6 CMV Error:

1= Common mode voltage error was

detected on the last channel that was

acquired

5 GO Status: status of the gain override enable

bit

4 Reserved

3:0 Currently configured ADC data rate

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 64 65

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