Rhombus Access Control System
DC5V RS485 Board/RS485 communication board/ SP485/MAX485 on board 5V
DC5V RS485 Board/RS485 communication board/ SP485/MAX485 on board 5V
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Description
RS-485 is a serial communication protocol standard based on differential signal
transmission. Comparing with RS-232 which has the transmission distance limit of
15m, RS485 can be used effectively over long distances and is widely used in many
industrial applications.
RS-485 communication is a half-duplex communication using a twist pair to transmit
differential signal, so it requires data receive and transmission modes switch.
* The RS485 Board is an accessory board used for adding the RS485 transceiver
to your application board.
* SP485 / MAX485 are RS485 transceivers requiring 5V power supply.
* SP3485 / MAX3485 are RS485 transceivers requiring 3.3V power supply
Pin description
| Symbol | Meanings |
| VCC | MCU power supply VCC |
| GND | MCU power supply GND |
| RO | Data Receiver Output, TTL level, connected to RX of MCU |
| DI | Data Driver Input, TTL level, connected to TX of MCU |
| RSE | Active HIGH for Driver Input Enable; Active LOW for Receiver Output Enable. It can be controlled by a common IO interface. |
| A | Driver Output/Receiver Input. Non-inverting |
| B | Driver Output/Receiver Input. Inverting |
Dimension
Package：
1x RS485 Board
