California Instruments 2253iX Manual de instrucciones descargar pdf (Pagina 46)

Programming Manual Compact i / iX Series

AMETEK Programmable Power Division 46

Syntax MEASure:ARRay:MODe

Parameters BIN | ASCii

Examples MEAS:ARR:MOD ASC

Related Commands MEAS:ARR:VOLT MEAS:ARR:CURR

Note: The MEAS:ARR:MOD command is provided to allow waveform data transfers in ASCII on

DBCS versions of MS Windows. Examples of DBCS versions are Chinese, Korean, Japanese

etc. On most Windows versions, the binary mode can be used as it reduces the amount of data

transferred and thus provides better throughput.

The ASCII mode will double the number of characters transferred so provisions for a larger

receive buffer on the PC may have to be made. On the i/iX, the full acquisition data size that can

be sent with one command in BIN mode is 16KB, in ASC mode 32KB.

The binary data must be converted to a single precision floating point notation. Sample VB6 code

is shown on the next page.

Conversion function sample VB6. Converting waveform data from either transfer mode to a single

precision value can be accomplished using the following sample routine:

Public Function StringToIEEEFloat(ByVal sData As String, ByVal bAsciiMode As Boolean) As

Single

'=============================================================

'bAsciiMode flag is used if data is received as 8 ascii chars

'representing Hex 0-9,A-F. If bAsciiMode flag is false, then

'data is process as 4 char representing a byte each. Ascii

'mode is needed for DCBS windows

'=============================================================

Dim i As Integer

Dim j As Integer

Dim iChar As Integer

Dim expo As Long

Dim mantisse As Long

Dim expo_val As Variant

Dim mant_f As Single

Dim c(3) As Long 'Must use 32 bit integers to allow for

'intermediate result of 24 bit shift

Dim sign As Boolean

'=============================================================

Const MANT_MAX = &H7FFFFF

Const EXPO_MAX = 2 ^ 126

'=============================================================

On Error GoTo FloatConvError

If bAsciiMode Then

'Retrieve ASC values from eight hex byte input data

sData = UCase(sData)

For i = 0 To 3

c(i) = 0

For j = 0 To 1

iChar = AscB(Mid$(sData, i * 2 + j + 1, 1)) - 48

If iChar > 9 Then iChar = iChar - 7

c(i) = c(i) * 16 * j + iChar

Next j

Next i

Else

'Retrieve ASC values from four byte input data

'Note: Don't use ASCB or ASCW functions as results will differ

'based on character sets, even on non DCBS Windows

'Retrieve ASC values from four byte input data

For i = 0 To 3

c(i) = Asc(Mid$(sData, i + 1, 1))

Next i

End If

'Get sign bit

sign = ((c(0) And &H80) = &H80)

'Get exponent value less sign bit

expo = (c(0) And &H7F) * 2

'Pick up exponent sign

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 215 216

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