Nortec LINKS 2 NHTC Installation And Operation Manual page 26

Problem
The BMS network cannot read/write any
information to any of the networked
humidifiers
The BMS network can see some of the
networked humidifiers but not others.
The BMS network receives information
from the networked humidifier(s) but the
information is mismatched or the
humidifier responds un-expectedly
After sending the humidifier a network-
based demand signal the unit powers
down after several minutes. The
nviNetSensor variable is switched on
and a value has been set for the
nviRHDem1 variable.
22 | Troubleshooting
Table 8: Troubleshooting Communication Problems
Solution
Verify that the network connection is made and is connected
properly.
Verify that the correct network settings are being used. The
LINKS 2 module may need to be restarted to load the new
settings.
Check the Serial Port Activity LED on the NORTEC OnLine
module to ensure proper communication with the humidifiers.
Data is first received from the humidifier to the OnLine
module. The OnLine module then transmits this data, via the
Ethernet port, to the LINKS 2 module.
Check the Ethernet port activity on the LINKS 2 module to
ensure it is receiving data from the NORTEC OnLine module.
Check the transmit and receive status LEDs to determine if
there is any network traffic being sent or being received by
the LINKS 2 module from the BMS network
Verify proper connections to networked humidifiers.
Turn the LINKS 2 module and the OnLine module off for
several seconds then switch it back on to reload the control
program. Allow for some time for the network variables to be
polled.
Ensure network variables are mapped correctly to the BMS.
Ensure proper connections to the humidifiers.
Disconnect all of the humidifiers from the LINKS 2 package
except for the unit that is not responding to the network. Turn
the LINKS 2 package off and then back on. Check if the
humidifier can now be seen by the BMS
Verify that the network variables have been mapped to the
BMS network correctly. It is possible that the variables have
been cross-linked during the network integration process.
Connect humidifiers one at a time and test units individually.
When a BMS network demand/RH signal is being used the
network must refresh the nviRHDem signal at least every 5
minutes otherwise the humidifier will revert to a 0 demand
state. This is a safety precaution in case the BMS network
connection is lost.