User`s guide

PCLTA-20 Adapter User’s Guide 4-5
Rebooting a PCLTA-20 Adapter
During development, a programming or installation error may cause a host
application to corrupt the EEPROM memory within a PCLTA-20 adapter. If an error
occurs, indicating that the PCLTA-20 adapter has detected a fatal error or is
experiencing watchdog resets, then the adapter firmware must be forced to reboot its
internal state. In most cases, it will be possible to reboot the PCLTA-20 adapter over
the network by using a network tool to zero the adapter’s Boot ID. The address of the
Boot ID is
0xF1FE
. The contents of this location may be easily changed during
development by using the LonBuilder memory browser. See Chapter 13 of the
LonBuilder User's Guide
2
.
If the error is serious enough, the PCLTA-20 adapter’s EEPROM must be cleared
from the host. Open the PCLTA-20 control panel, click the Diagnostics button to
open the Diagnostics dialog box, and type
Alt-=
. A dialog box will appear prompting
for confirmation of the EEBLANK operation. Click “Yes” to clear the PCLTA-20
adapter’s EEPROM.
Default Configuration
The PCLTA-20 adapter is manufactured with a default configuration in the on-chip
EEPROM of the Neuron Chip. Tables 4.1 to 4.3 show the default settings.
Table 4.1 Miscellaneous PCLTA-20 Configuration Parameters
Configuration Parameters Default Setting
Neuron Chip state Unconfigured
Explicit addressing Enabled
Network variable processing Host Selection
Program ID string "PCCLON"
The Neuron Chip state is normally modified by a network tool as part of the
installation process. The program ID string may be modified from the host by
sending a Write Memory network management message, specifying the Program ID
field of the Read-only Data Structure. The application checksum must be updated.
For more details on network management messages, and the Neuron Chip data
structures, see the
Neuron Chip Data Book
, Reference [3], Appendices A and B.