Nortec Modbus - Manual (Page 8)

NHTC, GSTC, SETC, and MHTC Models
The NHTC, GSTC, SETC, and MHTC models use a multifunction RJ45 plug on the mainboard to
provide Modbus communications. Connections can be made directly to this plug or,
alternatively, using one of accessories listed above.
Refer to figure 4 for information on the wiring connections for these units.
Note: This instruction manual covers the connections and points for the GSTC B+ and SETC B+
models only. Older models, manufactured pre-2009 do not include the RJ45 plug and require
an additional interface cable. Contact Nortec for information on connecting these units.
MES2 and RH2 Models
The MES2 and RH2 models require a Modbus support board to provide a connection point. This
board can be factory installed if indicated at time of order, or retrofit to existing units in the field.
Refer to Figure 5 for information on the wiring connections for these units.
NHRS Models
The NHRS models require a Modbus kit to translate information from the processor board into
Modbus RTU information. This kit can be factory installed if specified at time of order or retrofit
to existing units in the field. Refer to figure 6 for information on the wiring connections for these
units.
Modbus Installation | 5