HindlePower AT Series Operating Instructions Manual page 11

HARDWARE
3.2.2 RS-485 Single Connection
When a single device is connected using RS-485, the terminating resistor is required. Move
the jumper on J22 to pins 1 and 2 to enable the terminating resistor. The device
communicating with the charger needs its own terminating resistor installed.
Figure 5
RS-485 Single Connection
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