Phoenix Connector For Com3, Rs-485 (Cn3) - Advantech RSB-4210 Evaluation Kit User Manual

2.2.3

Phoenix Connector for COM3, RS-485 (CN3)

RSB-4210 supports one RS-485 interface. And CN3 is the phoenix
connector for RS-485.
Note: For RS-485 applications, the two ends of the cable will have a
termination resistor connected across the two wires. Without
termination resistors, reflections of fast driver edges can cause
multiple data edges that can cause data corruption. Please add a
termination resistor (120 ohms) on your end device (R289 of RSB-
4210, default is 120 ohms), please refer Figure 2-7 and Figure 2-8.
Figure 2-6 Phoenix Connector for COM3, RS-485
Pin
1
Figure 2-8 Schematic about RS-485 of RSB-4210
RSB-4210 Evaluation Kit User Manual
Description Pin
RS485_TXD-
Figure 2-7 RS-485 Application
16
Description
2 RS485_TXD+