Black Box GEH-6510 - Manual (Page 80)

DDE Server User’s Guide Chapter Six - Advanced Options •••• 77
When either the Protocol Timer Tick or the Valid Data Time-out fields have been
changed, the OK button is enabled. It is disabled until any changes are made. Click
on this button to accept changes. The changes take effect the next time the Server
software is launched (not to be confused with Run from the Server menu).
CAUTION: Changing the Server operational parameters can adversely affect the
Server’s performance. If you are unsure of how to adjust any of these settings,
consult Customer Support before making any changes.
PMCS DDE Server .ini File
The application program’s .ini file contains several lines that may be modified by
knowledgeable and qualified personnel to fine tune performance of an individual
network. Do not modify these items unless you are experienced with the PMCS DDE
Server.
NOTE: Back up the application’s current .ini file before attempting any of these
modifications.
Open the application’s .ini file with Windows Notepad. This file is named
GE32MODB.ini for the Modbus RTU version or GE32EIND.ini or
GE32MTCP.ini for the Ethernet version of the software, and is located in the
Windows 2000 SP2 directory. The parameters are grouped by subject:
[Server Operational Parameters]
[GE32MODB] or [GE32EIND] or [GE32MTCP]
Port Settings], etc.
Look for the GE32MODB or GE32MTCP group (depending on whether you’ve got
a Modbus-based system or an Ethernet-based system), and locate the following line
items:
Communication Time-out
When the Server receives a request for data from a client, it sends a request for data
to the appropriate device. The communication time-out is the length of time in
milliseconds that the Server will wait for a reply after sending a message to a device.
If a reply is not received in this length of time, the Server declares a time-out.
The default Communication Time-out value is 2000 milliseconds.
Increasing this number may improve communication reliability, but will decrease
performance.
Slow Poll Count
The Slow Poll Count is a multiplier, with a default value of 10. The Slow Poll
Count multiplied by the scan interval for a topic equals the scan interval for a
register block if slow poll has been selected.
Increasing the Slow Poll Count value causes the Sever to scan slow-poll data less
often, allowing more time to be devoted to scanning fast-poll registers. Decreasing
this value requires the slow-poll register groups to be scanned more often, reducing
the performance of fast-poll scanning.