A32 Pro Esp32 S3 Modbus Register 107: S5140 Channel 8 Current (24V) - Alternator Charger

Technical Definition

The register S5140 Channel 8 Current (24V) - Alternator Charger at address 107 is used to monitor s5140 channel 8 current (24v) - alternator charger on the A32 Pro Esp32 S3.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: A
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read S5140 Channel 8 Current (24V) - Alternator Charger (Address: 107)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=107, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "S5140 Channel 8 Current (24V) - Alternator Charger"
  address: 107
  value_type: U_WORD
  unit_of_measurement: "A"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[A32 Pro Esp32 S3]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Current draw (in Amps, likely) for the Alternator Charger (S5140 Channel 8).

Troubleshooting: Zero current indicates charger is off or not charging. Verify alternator and charging system status.