Johnson Controls 300 Series Manual page 93

Network Control Module 300 Series Technical Bulletin 93
Running Metasys Database Programs with an Active PMI -
Serious ARCNET N1 network corruption can occur if Windows 95 or
Windows 98 operating systems configures the PC hardware.
Windows 95 and Windows 98 operating systems include an additional
ARCNET driver that becomes active with a Metasys DOS database
application such as UNDDL. Metasys Release 9.01 or later prevents
the NCM from crashing if this situation occurs. Make sure the
Windows 95 or Windows 98 operating systems provided ARCNET
driver is not present on the OWS.
NCM NOVRAM Mirroring - After reviewing NCM problems
encountered at customer sites, we enhanced the reliability of NCMs
during power cycles. Changes were made in both EPROM and flash
downloads. A CRC (checksum) is now implemented on NOVRAM
and DRAM.
If the NOVRAM CRC passes during power up, the NCM powers up
normally. If the NOVRAM CRC fails power up, the DRAM is CRC
checked. If correct, the DRAM is copied to NOVRAM and the NCM
boots up normally. If both the NOVRAM and DRAM fail CRC
checks, the factory default settings are written to NOVRAM and the
NCM does not boot.
All new NCM350s shipped starting August 1, 1998 have the mirroring
built in. Metasys Release 9.01 or later is required to gain the full
benefit of mirroring.
Upgrade all mission-critical NCM300s previously installed by
ordering and replacing the on-board SIMM module. Metasys Release
9.01 or later is required to gain the full benefit of mirroring. Upgrade
all critical NCM350s by installing Metasys Release 9.01 or later and
perform the flash download using NCSETUP. No hardware upgrade is
required.
NCM Diagnostics
Metasys Release 9.01 or later allows the mapping of Analog Data
(AD) software objects to NCM operating system attributes. Table 31
shows the reserved attributes are entered in the associated hardware
attribute field. The Associated System/Object fields are left blank.
The reserved word attributes are: