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DDE Server User's Guide
Individual Bits In Registers
Individual bits in registers are read-only. They can be read as discrete/integer tags by
using the following notation (explained beneath):
X indicates an address is
hexadecimal. If the X is not present,
the address is read as decimal.
R indicates a Register
address follows.
f indicates the
register type.
D stands for Discrete type
specifier, and indicates that bit
Examples
Register
Represents
Number
R40001D1-0
Specifies least significant bit of first holding register
R30008D1-15
Specifies most significant bit of an input register
R40001D2-5
Specifies 6
register.
R <f> <[X]nnnn>DL-B
data is being requested.
th
th
and 7
from the least significant bit of first holding
Appendix A – Register Addressing Conventions • • • • 83
nnnn is the actual address. Four
characters are required, so leading
zeroes must be used if necessary.
For example, the correct syntax is
0025 rather than 25.
B indicates the
starting bit
number.
L indicates the specific
number of bits being
requested.
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