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Register Array Format
84 • • • • Appendix A – Register Addressing Conventions
If multiple data items are being requested from a single topic, it is more efficient to
request a block of contiguous registers than to place multiple requests for single
registers. This is referred to as register array format. The register array format is
used for the following applications:
•
to read a block of register values into a column of cells in a worksheet
(such as Microsoft Excel).
•
to pass waveform data to a client application (refer to GEH-6509,
PMCS DDE Server Interface Reference, for details)
The rules for register arrays are as follows:
1.
A register array, or series of consecutive registers, can be treated as a
block of numeric values. Up to 100 sixteen-bit registers or 50 thirty-
two-bit registers can be read as a block. Enter the starting register
address, and append it with type specifier "A", followed by the length
field. For example, the register address R30501A12 accesses registers
501 through 512 as a block.
2.
When the DDE Server returns a new value for a register array to the
client, it is in the form of a character string containing a value for each
register, separated by a carriage return.
For example, for R30021A6, the values returned might look like this:
50<cr><lf>
17<cr><lf>
0<cr><lf>
5<cr><lf>
1007<cr><lf>
20<cr><lf>
NOTE: All arrays must be terminated by a null character (ASCII 0).
3.
When the client application writes a value to a register array, it must be
in the form of a character string containing a value for each register in
the array. The register values can be separated by commas, tabs, spaces,
carriage returns or line feeds. For example, for R40001A6, the value
string could be written:
1,2,3,4,5,6
or
1<tab>2<tab>3<tab>4<tab>5<tab>6
or
1 2 3 4 5 6
DDE Server User's Guide
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