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2600 Family Instruction Manual

34

Chapter 6 : Model 2608 Analog I/O Module

Returned values are not corrected to eliminate

gain and offset errors. Each returned Data word

value is scaled approximately as follows:

6.6.6 GetIntegrateds

Function Returns the most recently acquired integrated

values from the 16 external AIN channels.

Opcode 0x05

Command none

Response (Data[0]<7:0>),(Data[0]<15:8>),

... ,

(Data[15]<7:0>),(Data[15]<15:8>)

Notes Like the GetSnapshots action, this action

does not cause AIN channels to be digitized; it

simply returns previously digitized values. The

ages of the returned values range from 0 to 16

milliseconds.

The differences between these data values and

those returned by GetSnapshots is the age of

the data and the amount and nature of the applied

filtering.

6.6.7 GetInternals

Function Returns the most recently acquired integrated

values from all internal reference standards and

the on-board temperature sensors.

Opcode 0x0B

Command none

Response (LgMax[0]),(LgMax[1]),

(LgMin[0]),(LgMin[1]),

(HgMax[0]),(HgMax[1]),

(HgMin[0]),(HgMin[1]),

(Temp[0][0]),(Temp[0][1]),

(Temp[1][0]),(Temp[1][1]),

(Temp[2][0]),(Temp[2][1]),

(Temp[3][0]),(Temp[3][1]),

(Temp[4][0]),(Temp[4][1]),

(Temp[5][0]),(Temp[5][1]),

(Temp[6][0]),(Temp[6][1]),

(Temp[7][0]),(Temp[7][1])

Notes This action does not cause the reference

standards to be digitized; it simply returns the

previously digitized standards values. The

returned data are the uncorrected binary values

obtained from the digitizer. These values are not

valid immediately following a module reset;

allow at least 32 milliseconds following a module

reset before executing this action.

All reference standards are measured at low gain,

except HgMax and HgMin, which are measured

at high gain. Each returned word value—which

represents the measured output voltage produced

by the associated voltage or temperature

reference—is scaled to a resolution of

approximately 305 µV (low gain) or 3.05 µV

(high gain).

Reference voltage values may be used to

normalize measurements from external AIN

channels and the on-board temperature sensors so

as to eliminate circuit gain and offset errors.

Refer to the distribution media middleware

documentation for details.

6.6.8 SetLineFreq

Function Declares the power line frequency used in the

application environment.

Opcode 0x0C

Input Range Data Scaling, Per Bit

±10 V range 305.1758 µV

±100 mV range 3.051758 µV

Parameter Function

Data Word array containing the acquired

values from all analog input channels.

Data ordering begins with channel 0

and progresses by increasing channel

number. All word values are returned

least significant byte first.

Parameter Function

LgMax +10V ref @ low gain, LSB first.

LgMin 0V @ low gain, LSB first.

HgMax +100mV ref @ high gain, LSB first.

HgMin 0V @ high gain, LSB first.

Temp[0] Chan 0-1 temperature, LSB first.

Temp[1] Chan 2-3 temperature, LSB first.

Temp[2] Chan 4-5 temperature, LSB first.

Temp[3] Chan 6-7 temperature, LSB first.

Temp[4] Chan 8-9 temperature, LSB first.

Temp[5] Chan 10-11 temperature, LSB first.

Temp[6] Chan 12-13 temperature, LSB first.

Temp[7] Chan 14-15 temperature, LSB first.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 79 80

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