YF-504A RS485 Signal Amplifier Distributor has the function of intermediate amplification, which can convert 1-channel RS485 signal input into 4-channel RS485 signal output and extend the communication distance.
The YF-504A RS485 signal amplifier/distributor expands a single RS485 input to four isolated outputs, each capable of driving up to 128 terminals for a total of 512 nodes. It supports unidirectional transmission and can extend communication distance up to 1200 m, with ports designed for anti‑static and lightning protection.
Installation requires a DC9‑12 V, 500 mA power supply, proper A/B wiring, and a 120 Ω termination resistor at the far end of each loop (only one resistor per loop). The package includes the distributor, power adapter, manual, certification, and four 120 Ω resistors. This manual is written in Chinese.
| RS485 input channels | 1 |
|---|---|
| RS485 output channels | 4 |
| Maximum communication distance per output | 1200 m |
| Terminals per output | 128 |
| Total supported nodes | 512 (4 × 128) |
| Power input | DC9‑12 V, 500 mA |
| Port protection | Anti‑static, lightning‑proof |
| Termination resistor per loop | 120 Ω (one per loop) |
Each RS485 output can connect up to 128 terminals, allowing a maximum of 4 × 128 = 512 nodes.
The device requires a DC power supply of 9 to 12 V with a current rating of 500 mA.
Yes, a 120 Ω resistor must be placed at the far end of each RS485 loop, and only one resistor is allowed per loop.
Shielded twisted‑pair cable must be used; using parallel wires will greatly reduce communication distance.