Nortec Industries NHTC Series - Manual (Page 29)

10-30
Page 2
2008-02-18
(1) TROUBLESHOOTING
(1) When troubleshooting the communication process for OnLine and/or LINKS 2
modules should be kept in mind. Humidifier data is first received by the Nortec
OnLine module using the modbus protocol over the serial port connection. It then
forwards this data, via modbus/TCP, to the LINKS 2 module over an Ethernet link. A
router (switch for BACnet/IP applications) links the two devices together through their
Ethernet ports and allows a user to access both devices using only 1 customer
installed Ethernet line.
(2) INDICATOR LIGHTS
(1) There is a variety of status LEDs on both the OnLine module and the LINKS 2
module to aid in the diagnosis of communication problems. Note that communication
first occurs between the OnLine module and the humidifier logic board. The OnLine
module then passes information to the LINKS 2 module. If practical, it may be useful
to establish a connection with the Nortec OnLine server first and then establish
communication with the LINKS 2 module.