5-9
0x00B Waveform Sample Log
0x00C PQ Log
0x00D Reset Log
0x00E-0x0FF Undefined
The most significant byte defines the following modes, Paused Download Mode (0x000), and
Running Download Mode (0x001).
In Paused Download mode (0x000), the log being accessed is paused - new records are not added to
the log while it is paused.
In Running Download mode (0x001), the log being accessed is not paused - new records may be
added to the log. When downloading in this mode, it is possible that records may be overwritten
before, or even during, access to that record.
QAuto Increment Window Index (0x099FF)
When read, this register returns the index used by the Auto Increment Log Window, below, to access
logs on this port. When written, this register sets the index used by the Auto Increment Log
Window, below, to access logs on this port. Each port accesses a separate, independent index
through this register, allowing all four ports to access different areas of logs at the same time.
When read, the index is incremented before being returned in the Modbus response. If the Auto
Increment Mode is Paused Download Mode (0x001xx in register 0x099FE), the appropriate log is
paused, preventing the addition of new records while the log is being accessed. A30-second timer
is initiated on these reads. Should the timer run out (the index is not incremented/read in 30 sec-
onds), the appropriate log will be allowed to continue logging.
When a value of 0x0FFFF is written to this register, this signifies that the port is finished accessing
the appropriate log, and the 30-second timer is canceled and the appropriate log will be allowed to
continue logging.
Should multiple ports access the same log simultaneously, the log will be paused while either
30-second timer is running; the log will be allowed to continue logging only when both ports
time-out or write 0x0FFFF to their index register.
QAuto Increment Log Window (0x09A3F)
These registers are a 128-byte window into a log, as specified in the Auto Increment Configuration
(register 0x099FE). Depending on the Auto Increment Window Index, a different 128-byte area of a
log can be accessed.
QDownload using Auto Increment Window Sequence
1. Software should select the appropriate Download mode and log through the Auto Increment
Configuration register (0x000xx or 0x001xx to register 0x099FE).
2. Software should read the appropriate Header Information.
3. Software should initialize the window index by writing a value 1 less than the desired starting
index to the Auto Increment Window Index register (Example: To start at window 0, write