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5.5 - AIBurst [U12 Datasheet]

After receiving a AIBurst command, the LabJack collects 4 channels at the specified data rate, and puts data in the buffer. This continues until the buffer is full, at which time the LabJack starts sending the data to the host. Data is sent to the host 1 scan at a time while checking for a command from the host. If a command is received the burst operation is canceled and the command is executed normally. If the LED is enabled, it blinks at 4 Hz while waiting for a trigger, is off during acquisition, blinks at about 8 Hz during data delivery, and is set on when done or stopped.

Table 5.5-1.

Command

 

Byte #

Description

0

Bit 7: X

 

Bits 6-4: PGA for 1st Channel

 

Bits 3-0: MUX command for 1st Channel.

1

Bit 7: X

 

Bits 6-4: PGA for 2nd Channel

 

Bits 3-0: MUX command for 2nd Channel.

2

Bit 7: X

 

Bits 6-4: PGA for 3rd Channel

 

Bits 3-0: MUX command for 3rd Channel.

3

Bit 7: X

 

Bits 6-4: PGA for 4th Channel

 

Bits 3-0: MUX command for 4th Channel.

4

Bits 7-5: Number of scans ( 000 = 1024, 110 = 16)

 

Bits 4-3: IO to trigger burst on

 

Bit 2: State to trigger on

 

Bit 1: Update IO

 

Bit 0: LED State

5

Bits 7-4: 1010 (Start Burst)

 

Bits 3-0: Bits for IO3 through IO0 States

6

Bit 7: Feature Reports

 

Bit 6: Trigger On

 

Bits 5-0: AIINTMSB (High 6 bits of sample interval)

7

AIINTLSB (733 = min => ~8192 Hz)

 

 

 

 

Response

 

Byte #

Description

0

Bit 7-6: 10 (binary)

 

Bit 5: Buffer Overflow if Backlog = 11111, Checksum Error if Backlog = 0

 

Bit 4: PGA Overvoltage

 

Bits 3-0: Bits for IO3 through IO0 State

1

Bits 7-5: Iteration Counter

 

Bits 4-0: Backlog/256

2

Bits 7-4: Most Significant Bits from 1st Channel

 

Bits 3-0: Most Significant Bits from 2nd Chanel

3

Least Significant Byte from 1st Channel

4

Least Significant Byte from 2nd Channel

5

Bits 7-4: Most Significant Bits from 3rd Channel

 

Bits 3-0: Most Significant Bits from 4th Chanel

6

Least Significant Byte from 3rd Channel

7

Least Significant Byte from 4th Channel

  • PGA Gain Setting – (Differential Only) 0b000 = 1, 0b001 = 2, 0b010 = 4, 0b100 = 8, 0b101 = 10, 0b110 = 16, 0b111 = 20

  • Mux Settings – 0b0000 = 0-1 (Differential), 0b0001 = 2-3 (Differential), 0b0010 = 4-5 (Differential), 0b0011 = 6-7 (Differential). Single-Ended readings = 0b1000 + AI Number.

LabJackPython Example

>>> import u12
>>> d = u12.U12(debug=True)
open called
Writing: [0x0, 0x0, 0x0, 0x0, 0x0, 0x57, 0x0, 0x0]
Received: [0x57, 0x0, 0x0, 0x0, 0xff, 0xff, 0x0, 0x0]
>>> d.rawAIBurst()
Writing: [0x8, 0x9, 0xa, 0xb, 0xe1, 0xa0, 0xa, 0x98]
Received: [0x80, 0x0, 0x99, 0x8, 0x2a, 0x99, 0x2c, 0x6]
Received: [0x80, 0x20, 0x99, 0xc, 0x2a, 0x99, 0x2c, 0x4]
Received: [0x80, 0x40, 0x99, 0xc, 0x2c, 0x99, 0x2a, 0x6]
Received: [0x80, 0x60, 0x99, 0xc, 0x2a, 0x99, 0x2c, 0x4]
Received: [0x80, 0x80, 0x99, 0xc, 0x2c, 0x99, 0x2c, 0x6]
Received: [0x80, 0xa0, 0x99, 0x0, 0x2a, 0x99, 0x2c, 0x4]
Received: [0x80, 0xc0, 0x99, 0xc, 0x2a, 0x99, 0x2c, 0x6]
Received: [0x80, 0x0, 0x99, 0xc, 0x2a, 0x99, 0x2c, 0x6]
{
'Channel0': [1.2890625, 1.30859375, ..., 1.30859375],
'Channel3': [1.279296875, 1.26953125, ..., 1.279296875],
'Channel2': [1.46484375, 1.46484375, ..., 1.46484375],
'PGAOvervoltages': [False, False, ..., False],
'IO3toIO0States':
[
<BitField object: [ IO3 = Low (0), IO2 = Low (0),
IO1 = Low (0), IO0 = Low (0) ] >,
<BitField object: [ IO3 = Low (0), IO2 = Low (0),
IO1 = Low (0), IO0 = Low (0) ] >,
...,
<BitField object: [ IO3 = Low (0), IO2 = Low (0),
IO1 = Low (0), IO0 = Low (0) ] >],
'BufferOverflowOrChecksumErrors': [False, False, ..., False],
'Channel1': [1.455078125, 1...., 1.455078125],
'IterationCounters': [0, 1, 2, 3, 4, 5, 6, 0],
'Backlogs': [0, 0, 0, 0, 0, 0, 0, 0]
}

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