Modbus Communication
‑24‑
Figure 3‑5 Star topology (prohibited)
3. Terminal wiring
● Terminal wiring for nodes with CGND
MD38TX1 provides three cables, which connect to terminals RS485+, RS485–,
and CGND respectively. Check that the RS485 field bus has these three cables
and the wiring terminals are not connected reversely or incorrectly. If a shielded
cable is used, connect the shield layer to CGND. Never connect the shield layer
to any terminal except CGND, including the drive housing and grounding
terminal.
Considering cable attenuation, you are advised to use AGW26 or thicker cables if
the connection length is longer than 3 m. Always use twisted pair cables to
connect RS485+ and RS485–.
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