Black Box GEH-6510 - Manual (Page 84)

DDE Server User’s Guide Appendix A – Register Addressing Conventions •••• 81
t represents the type of data, if there are any
special conventions. See the following section
“Special Naming Conventions” for details.
A indicates that the data is an Array.
See the following section “Register
Array Format” for details.
-b represents the reading of
individual bits. Not present if
reading whole registers or an
array of registers. See the
following section “Individual
Bits in Registers” for details.
lll provides the length of the array
or ASCII string in bytes, This field
is present only if the address
represents an array or an ASCII
string. Leading zeros are not
required for this field.
R <f> <[X]nnnn> [t] [A] [lll] [-b]
Standard Data Organization
Data is organized according to data type, numeric range, tag type, and access type.
Data Types
There are four data types typically used by the GE devices. These four data types are
the possible values for ‘f’ in the address. (Each data type is organized in a separate
table for each device in this manual):
1. Dynamic Value
2. Setpoint
3. Command Coil
4. Fixed Value
Each data type is assigned a range of register numbers, tag type, and access as shown
below:
Data Organization
Data
Type Use Register
Range
(hex) Register
Range
(decimal) DDE
Tag
Type Type of
Access
Command
Coil 1. Commands a device to take
action.
2. Reads the status of an
action or discrete input. R0X0000 –
R0XFFFF R00000 –
R09999 Discrete Read and
Write
Dynamic
Value Read frequently, such as
metering values which change
constantly R3X0000 –
R3XFFFF R30000 –
R39999 Analog Read Only
Fixed
Value Read only once at power-up.
Info such as Product ID and
configuration options R4X0000 –
R4XFFFF R40000 –
R49999 Analog Read Only
Setpoint Read infrequently R4X0000 –
R4XFFFF R40000 –
R49999 Analog Read Only