Modern RTUs and PLCs (Programmable Logic Controllers) offer a wide variety of communications means, either built in directly or through a module.
The following list represents a variety of transmission methods supported:
- RS-232/RS-442/RS-485
- Dialup telephone lines
- Dedicated telephone lines
- Microwave
- Satellite
- X.25
- Ethernet
- 802.11a/b/g
- Radio (VHF, UHF, etc)
- Wireless
- Modbus
- Profibus
- Fieldbus etc
Author: Arjun Venkatraman