Connection
19
Internal input circuit
GND of the power supply connector and SG of the RS-485 communication connector are electrically insulated.
SW3 is a double-pole double-throw switch.
Driver 1st unit
SG
RS-485
*1
SG
TR+
TR−
SG
TR+
TR−
120 Ω
1 kΩ
1 kΩ
5 V
SG
SG
SW3
SW3
Driver 2nd unit
SG
TR+
TR−
SG
TR+
TR−
120 Ω
1 kΩ
1 kΩ
5 V
SG
SG
SW3
SW3
Driver 31st unit
SG
TR+
TR−
120 Ω
1 kΩ
1 kΩ
5 V
SG
SG
SW3
SW3
*2
*2
*1 Termination resistor 120 Ω
*2 Turn the termination resistor ON.