polling mode

In polling mode, a central control station controls and monitors the communication between transmitter and receiver. This control method is therefore also called centralized multipoint operation.

In polling mode, the stations are addressed by the master station via addressing. The master station, the primary station, requests a remote master station to transmit or the secondary station or slave station to receive. This avoids possible contention on multipoint links. Addressing can be done in turn or according to a different priority scheme, such as demand-priority.

In contrast to daisy chaining, polling can be implemented without additional lines or additional channels. The disadvantage of monopolizability is eliminated by the polling mode. This type of communication is characteristic of terminal networks.