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5.7 - Pulseout [U12 Datasheet]

This command creates pulses on any to all of D0-D7. The desired D lines must be set to output with some other function. For best accuracy, when using the BC*20us approximation, keep C as small as possible. B and C must be >= 1, and must do at least 1 pulse ( LSB >= 1 ).

Table 5.7-1.

Command

 

Byte #

Description

0

B1

1

C1

2

B2

3

C2

4

Bits for D7 through D0 ( 1 = Pulse the D line )

5

011XX100 (Pulseout)

6

Bit 7: Clear First?

 

Bits 6-0: MSB Number of Pulses

7

LSB Number of Pulses

 

 

 

 

Response

 

Byte #

Description

0

Echo of byte 0 of Command

1

Echo of byte 1 of Command

2

Echo of byte 2 of Command

3

Echo of byte 3 of Command

4

Bits of direction errors for D7 through D0

5

011XX100 (Echo of byte 5)

6

Echo of byte 6 of Command

7

Echo of byte 7 of Command

  • B1/C1 – Period of first half cycle is ~100+5C+121BC or about BC*20µs

  • B2/C2 – Period of second half cycle is ~70+5C+121BC or about BC*20µs

LabJackPython Example

Connect a jumper wire from D0 to CNT.

>>> 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.rawDIO(D7toD0Directions = 0, UpdateDigital = True)
>>> d.rawCounter(ResetCounter = True)
>>> d.rawPulseout(ClearFirst = True)
>>> print d.rawCounter()
{
'IO3toIO0States': ... ,
'Counter': 5,
'D7toD0States': ... ,
'D15toD8States': ...
}

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