Nortec Modbus - Manual (Page 42)

NHRS Electric Steam Humidifiers
After wiring connections have been completed, the humidifier needs to be setup to operate and
communicate through the Modbus interface.
Modbus Address
The default Modbus address for a NHRS is 1. If multiple units were included on an order, the
addresses of individual units may vary.
To view or change the unit number:
1 Press both the ↑ and ↓keys simultaneously to access the menu.
2 When prompted for a password, enter 8808 using the arrow keys.
3 Scroll through the menu until and select the Modbus Address.
4 Enter a value between 1 and 127 inclusive as desired.
5 Press both the ↑ and ↓keys simultaneously to return to the main menu.
This procedure is summarized below:
↑ and ↓ > 8808 > Modbus Address > 1 to 127
Control Signal Setting
By default the humidifier is configured operate on a hardwired control signal supplied through
the unit terminal strip. This can be changed to allow the humidifier to function entirely through
its Modbus interface.
To adjust this setting:
1 Establish Modbus communications and map points as indicated in the following table.
2 Write a value of 1 to address 40039. A value of 1 indicates control through Modbus, a value
of 0 indicates controls hardwire to terminal strip.
The control type can also be modified:
1 Press both the ↑ and ↓keys simultaneously to access the menu.
2 When prompted for a password, enter 8808 using the arrow keys.
3 Scroll through the menu until and select the Controller Func.
4 Select Off for a demand type control, or On for sensor (transducer) control.
5 Press both the ↑ and ↓keys simultaneously to return to the main menu.
Modbus Installation | 39