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How to connect PM5000 on the RS-485 bus
Use the straight-line or loop topology when connecting your devices on the RS-485 bus.
![PM5000 PM5000](https://ckm-content.se.com/ckmContent/servlet/servlet.ImageServer?id=0151H000009M5eKQAS&oid=00DA0000000abSm)
To reduce signal reflections on the RS-485 network when using the straight-line wiring method, connect a terminating resistor (RT) across the (+) and (-) terminal of the last device on the bus. The terminating resistor should match the impedance of the RS-485 cable, typically 120 ohms.
![PM5000 PM5000](https://ckm-content.se.com/ckmContent/servlet/servlet.ImageServer?id=0151H000009M5rGQAS&oid=00DA0000000abSm)
There are a couple of advantages to using the loop topology:
• A single open-circuit condition anywhere on the loop does not result in communications loss for all the other connected devices on the RS-485 bus.
• It does not require termination resistors at any point on the RS-485 bus.
To reduce signal reflections on the RS-485 network when using the straight-line wiring method, connect a terminating resistor (RT) across the (+) and (-) terminal of the last device on the bus. The terminating resistor should match the impedance of the RS-485 cable, typically 120 ohms.
There are a couple of advantages to using the loop topology:
• A single open-circuit condition anywhere on the loop does not result in communications loss for all the other connected devices on the RS-485 bus.
• It does not require termination resistors at any point on the RS-485 bus.
Released for:Schneider Electric Thailand
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Related products for Schneider Electric Thailand
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