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sensor:ttl_to_rs485 [2025/11/13 22:02] – vamsansensor:ttl_to_rs485 [2025/11/13 22:42] (current) – [lamaPLC: TTL to RS485 Module] vamsan
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 ====== lamaPLC: TTL to RS485 Module ====== ====== lamaPLC: TTL to RS485 Module ======
 {{ :sensor:max485_2.png?120|TTL to RS485 Module}} {{ :sensor:max485_2.png?120|TTL to RS485 Module}}
-The onboard MAX485 chip is a low-power, slew rate-limited transceiver for RS-485 communication. It is connected to 5.08 mm pitch 2P binding posts, which makes RS-485 wiring convenient. All the chip's pins are exposed and can be controlled and operated by the microcontroller. It operates on a single 5V power supply with a rated current of 300μA.+The module is often listed as **HW-097**. 
 + 
 +The onboard MAX485 chip is a low-power, slew-rate-limited transceiver for **RS-485** communication. It is connected to 5.08 mm pitch 2P binding posts, which makes [[com:basic_rs485|RS-485]] wiring convenient. All the chip's pins are exposed and can be controlled and operated by the microcontroller. It operates on a single 5V power supply with a rated current of 300μA. 
 + 
 + 
 +RS-485 is a type of asynchronous serial communication protocol because no synchronizing clock signal is transmitted with the data. RS-485 uses differential signaling to transfer binary data between devices. This differential signaling creates a differential voltage using positive and negative 5V supplies. The advantage of this method is its ability to reject common-mode noise. 
 + 
 +RS-485 supports a **maximum data transfer rate of 30 Mbps** and can connect many slaves to a single master. The protocol allows up to 32 devices to be connected. 
 + 
 +The module is suitable for Arduino and [[com:basic_modbus#rtu|Modbus RTU]] applications. In this setup, the Arduino should use Tx/Rx TTL communication, while the standard Modbus A+, B-, and GND connections should be made on the other side of the module. 
 ===== MAX485 switching logic ===== ===== MAX485 switching logic =====
 {{:sensor:max485_1.png|TTL to RS485 Module}} {{:sensor:max485_1.png|TTL to RS485 Module}}
  
 ===== MAX485 modul pinout ===== ===== MAX485 modul pinout =====
-{{ :sensor:max485_2.png|TTL to RS485 Module}}+{{ :sensor:max485_2.png?300|TTL to RS485 Module}}
 ^RO|TTL side|Receiver output| ^RO|TTL side|Receiver output|
 ^RE|TTL side|Receiver output enable| ^RE|TTL side|Receiver output enable|
 ^DE|TTL side|Driver output enable| ^DE|TTL side|Driver output enable|
 ^DI|TTL side|Drive input| ^DI|TTL side|Drive input|
-^Vcc||5V power supply| +^Vcc||**5V DC** power supply| 
-^A|RS-485 side|The non-inverting input of the receiver and the non-inverting output of the driver| +^A+|RS-485 side|The non-inverting input of the receiver and the non-inverting output of the driver| 
-^B|RS-485 side|Receiver inverting input and driver inverting output|+^B-|RS-485 side|Receiver inverting input and driver inverting output|
 ^GND||Ground| ^GND||Ground|
 +
 +===== Modbus topics on lamaPLC =====
 +{{topic>modbus}}
 +
 +\\
 +\\
 +{{tag>modbus rtu modbus_rtu HW-097 RS-485 MAX485}}
 +\\
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