Automation, sensing and robotics • Trying to Control JF-0530B 12V Solenoid with RPI3B and 12V Modbus Relay Module over RS485

Code:

import minimalmodbusimport time# Create instrument for each RS485 relay modulerelay1 = minimalmodbus.Instrument('/dev/ttyUSB0', 1)  # Port and slave addressrelay2 = minimalmodbus.Instrument('/dev/ttyUSB0', 2)  # Same port, different slave ID# Configure settingsfor relay in [relay1, relay2]:    relay.serial.baudrate = 9600    relay.serial.bytesize = 8    relay.serial.parity   = minimalmodbus.serial.PARITY_NONE    relay.serial.stopbits = 1    relay.serial.timeout  = 0.5    relay.mode = minimalmodbus.MODE_RTU# Relay channels are usually coil addresses 0–15def activate_relay(module, channel):    print(f"Activating Relay {channel + 1} on Module {module}")    if module == 1:        relay1.write_bit(channel, 1, 5)    elif module == 2:        relay2.write_bit(channel, 1, 5)def deactivate_relay(module, channel):    print(f"Deactivating Relay {channel + 1} on Module {module}")    if module == 1:        relay1.write_bit(channel, 0, 5)    elif module == 2:        relay2.write_bit(channel, 0, 5)# Example: Extend actuator on channel 3 (relay 4 on module 1)activate_relay(module=1, channel=3)time.sleep(2)deactivate_relay(module=1, channel=3)