Chapter 6 Wiring, Communication Setting and Network Construction
6
RS-485 Wiring:
Explanation of numbers
Master Slave
Notes:
1. Terminal resistors with the value of 120Ω are recommended to connect to both ends of the bus.
2. To ensure high communication quality, please use the shielded twisted pair cable (20AWG).
3. When the internal voltages of two devices are different, make SG (Signal Ground) of the two devices
connected with each other to balance their SG voltages and make the communication more stable.
Communication Format that RS-485 Supports
RS-485 communication port supports ASCII or RTU communication formats and the supported baud rate can
be up to 115200bps.
9600, 19200, 38400, 57600, 115200
Communication
format
Figure 19
D+
D-
SG
D+
D-
SG SG
D+ D-
3
4
1
2
2
3
4
6-9