Nortec Modbus - Manual (Page 7)

NH-EL Models
The NH-EL models use a 3 pole connector on the main processor card for Modbus connection.
This 3 pole connector is provided with all NH-EL and connections can be made directly to this
plug. Refer to Figure 2 and Figure 3 for connection location and wiring.
Please note: there is a 120 Ohm termination resistor available on board. When the jumper J4
is on, 120 Ohm is enabled. When the jumper J4 is off, 120 Ohm is disabled.
Figure 2: NHEL Modbus 3 Pole Plug Location
4 |Modbus Installation