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Models 2500 and 2502 User’s Manual SCPI Command Reference 17-45

Figure 17-2

IEEE-754 single precision data format (32 data bits)

During binary transfers, never un-talk the Model 2500 until after the

data is read (input) to the computer. Also, to avoid erratic operation, the

readings of the data string (and terminator) should be acquired in one

piece. The header (#0) can be read separately before the rest of the

string.

NOTE The Model 2500 terminates the binary data string with LF + EOI. If your pro-

gram is set to terminate on CR and/or LF, data transfer may terminate prema-

turely because one or more data bytes has a CR or LF value. To avoid the

problem, set your computer program to terminate on EOI only.

The number of bytes to be transferred can be calculated as follows:

Bytes = 2+(Rdgs × 4) + 1

where 2 is the number of bytes for the header (#0).

Rdgs is the product of the number of selected data elements, arm

count, and trigger count.

4 is the number of bytes for each reading.

1 is the byte for the terminator.

For example, assume the Model 2500 is conﬁgured to perform 10 source

and measure operations and send the 10 current measurements to the

computer using the binary format.

Bytes = 2 + (10 x 4) + 1

= 43

70707070

Header

Byte 1 Byte 2 Byte 3 Byte 4

s = sign bit (0 = positive, 1 = negative)

e = exponent bits (8)

f = fraction bits (23)

Normal byte order shown. For swapped byte order, bytes sent

in reverse order: Header, Byte 4, Byte 3, Byte 2, Byte 1.

The header and terminator are sent only once for each READ?

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Keithley 2500 User Manual

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