Check wire type and run length. Wire type should be 18 – 24 AWG,
shielded twisted pair wire with 120 ohm characteristic impedance.
Chains should not exceed 2000 feet in length.
Look for wire runs in close proximity to equipment generating
significant electrical noise (such as VFD's, medical equipment, X-ray
machinery, servers, etc).
Check that wire shield is terminated at one end only. Terminations
at both ends cause shield to conduct electricity and can generate
noise.
Confirm correct polarity of conductors at each device. This problem
can be the result of Net+ and Net- terminals being crossed.
Check Modbus addresses for conflicts with any device. Each
Modbus device on the network must have a unique address.
Devices (humidifiers or otherwise) cannot share Modbus addresses.
Ensure that no more than 8 devices are connected to a single
chain/bus. Humidifiers should be of the same type (gas, electric,
etc) but do not to be the same size.
Check Modbus addresses for conflicts. Each Modbus device on the
network must have a unique address. Devices (humidifiers or
otherwise) cannot share Modbus addresses.
This error is generated in cases where the humidifier is configured
for control over the Modbus network and a value is not written
without the timeout window. The timeout clock restarts each time a
value is written (even if the same value is written repeatedly).
The error is corrected by writing an appropriate value to the RHdem1
address:
NH-EL - 40005
NHTC – 40264
GSTC – 40264
SETC – 40264
MHTC – 40053
If it is desired to use hardwired controls instead of network controls,
the humidifier must be configured as such. Refer to the Control
Signal Setting section for your humidifier found earlier in this
manual.
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