Nortec LINKS XPS MH - Manual (Page 11)

Links XPS for MHTC | 8
2 Identify the Modbus and Building Automation System ends on the XPS module.
Figure 5: Communication Ports XPS Module
3 Connect the two white wires from the transformer to the power terminals on the Modbus end
of XPS module as shown in Figure 5. Also, connect one of the two short grey 3-wire cables into
the +, -, and GND terminals on the XPS module as shown in Figure 5.