SENTRON measuring devices and circuit breakers – RS485 / Modbus RTU wiring
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Question:
How is the RS485 / Modbus RTU wiring done for different PAC measuring devices with an RS485 interface?
Answer:
Marking of RS 485 device connections is not completely standardized. Different designations/versions of the connections must be expected for different devices.
Different requirements from different manufacturers may also apply to termination (terminating resistors, possibly even active termination).
From practice: The rule "A to A and B to B" only applies as long as the same device types are present in a communication line. If there is a mix of device types, this must be considered individually for each type.
Wiring example with different device types:
*1: 120 ohm terminating resistor. Use is optional and depends on the installation.
*2: Ground cable. Use is optional and depends on the installation.
*3: Use a shielded cable for installation (e.g. Profibus cable or Y(ST)Y 2x2x0.8).
The following table contains a collection of different devices and their RS485 connection designation, which shows the correct connection of the communication connections with each other.
FAQ_PAC_RTU_Wiring_EN.pdf (122.1 KB)
*1) Not available with 7KT1651
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