Siemens RUGGEDCOM RMC30 Installation Manual page 25

RUGGEDCOM RMC30
Installation Guide
NOTE
Transient protection is provided on all terminals. Lightning strikes and ground surge currents can cause
large momentary voltage differences between ends of communication links. For maximum reliability of
the entire link, all equipment should have similar transient protection installed.
The following shows the recommended RS485 wiring.
2
1
Figure 10: Recommended RS485 Wiring
1. RUGGEDCOM RMC30 Device With Built-In Termination 2. Common (Isolated Ground) 3. Negative 4. Positive 5. Shield to Earth
(Connected At a Single Point) 6. RS485 Devices (32 Total)
RS485/422 Data Ports
3 5
4
5
120Ω 10nF
Chapter 3
Communication Ports
6
17