Detailed Answer
FDD (Frequency Division Duplex) and TDD (Time Division Duplex) are duplex communication methods: FDD uses two different frequencies for transmit and receive, while TDD uses the same frequency with time-division transmit/receive. Industrial remote controls are mostly one-way (transmit → receive), which is half-duplex or simplex communication and does not involve strict duplexing. Some high-end models (XINGJIA) support bidirectional communication (remote control + status feedback) using TDD. Understanding duplexing helps when selecting products with bidirectional monitoring features.
| FDD | Dual-frequency TX/RX |
| TDD | Same frequency, time-division |
| Remote controls | Mostly simplex |
Note:Choose a model with bidirectional communication if you need status feedback.