Ametek Thermox 2000 ATEX Series User Manual page 63

Figure 3-22.
Series 2000, 2-wire RS-485
communication connection.
2-Wire termination resistor
The Series 2000 control unit is equipped with a termination resistor that
can be used for the last control unit on the network. Switch 3 on SW1 of
the display module allows you to place a 120 ohm termination resistor into
the RS-485 circuit:
Switch 3 of SW1 = On (Termination Resistor In Circuit)
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Installation 3-39