Communication modules
Space-saving. Versatile. Native.
In the world of PCs, COM ports have long been replaced by USB. However, in the field of industrial communication between devices, serial interfaces are still highly relevant. Even an RS-232 connection allows longer cable distances than USB. The balanced signal transmission of RS-422 enables robust data exchange over several kilometers - and this with a cost-effective copper cable. The RS-485 standard is suitable for both point-to-point connections and bus topologies with up to 32 participants.
A wide range of communication partners are available. Interoperability is ensured by standards such as IEC 60870-5-101, -103 or DNP3 Serial. Even proprietary protocols for peripheral devices, such as connecting an RFID reader, can usually be quickly integrated into an application program.
As well as performance, security is a key driver for the choice of COM-ports as serial interfaces. The point-to-point connection via physical cable between clearly identifiable devices offers a high level of security, as the communication cannot be disrupted by intermediate devices or network components. Cyberattacks on devices connected via COM ports are harder to execute and usually easier to detect compared to those in a TCP/IP network.
