-25-
4.5 RS485 Communication
We recommend to use shielded twisted pairs on RS485 bus, and twisted paird on 485 +, 485-;
The two ends of the bus are respectively connected with 120Ω terminal resistors to prevent signal
reflection; The reference ground of all Node 485 signals is connected together, 31 nodes max, and
the distance between branches of each node should be within 3m.
The RS485 bus connection topology is shown in the following figure.
When fixing cables, do not bundle them with AC power lines and high-voltage cables to avoid
interference among the communication signals.
4.6 CAN Communication
The CAN bus connection topology is as follows. It is recommended to use shielded twisted
pair for CAN bus, and the two ends of the bus are respectively
Connected to two 120Ω terminal resistors to prevent signal reflection. Generally, the shielding
layer is grounded at a single point.
When fixing cables, do not bundle them with AC power lines and high-voltage cables to avoid
interference among the communication signals.
4.7 Terminal Resistor
Terminal resistor dip switch for CAN and RS485 is located on the left side of VH600 controller,
Summary of Contents for VH600
Page 20: ...19 DIN DIN snap Screw...