Connection
4.4 Connecting to the RS485 bus
PAC1020
Equipment Manual, 05/2020, L1V30610008B-01
35
4.4 Connecting to the RS485 bus
Procedure
Connect the PAC1020 power monitoring device to the RS485 bus via the integral interface.
Please pay attention here to the general topology of the two-wire line.
1. Connect all three lines to the screw terminals.
2. Ensure a bus terminating resistance is set at the first and last communication node.
Block diagram
Bus termination resistor (termination)
Grounding of the cable shield
Grounding of the common line, preferably only at one point for the whole bus
Figure 4-9 Block diagram: General RS485 topology
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