Regmet PALNM - Light intensity sensor

Installation

1. 1Connect the Regmet PALNM to the RS485 terminals (A and B) on the ModbusCloud gateway, observing correct polarity.
2. 2Use a USB mini B cable and the free Regmet USB_SET application on a Windows PC to set the Modbus slave address, baud rate (19200), and parity (odd) on the sensor.
3. 3Ensure the ModbusCloud gateway serial port is configured to 19200 baud, odd parity, and 8 data bits to match the sensor settings.
4. 4Import the Regmet PALNM template from the ModbusCloud template library and assign it to the correct gateway and slave address.
5. 5Verify that light intensity and PIR readings appear on the ModbusCloud dashboard before closing the installation.

Things to watch for

01

I am not getting any response from the PALNM sensor on the RS485 bus. What should I check?

Confirm that the baud rate is set to 19200 and parity is set to odd (1 stop bit) on both the gateway and the sensor. Also verify the A and B wiring polarity and check that the correct Modbus slave address is configured.

02

Can I use this template with the PALNV111 variant?

The PALNV111 is primarily designed for 0 to 10V analogue output. It may support Modbus RTU as well, but verify with the Regmet documentation whether the RS485 interface is active on your specific PALNV111 unit before using this template.

03

How do I change the Modbus slave address on the PALNM?

Connect a USB mini B cable from the sensor to a Windows PC and open the free USB_SET application from Regmet. The slave address and other communication parameters can be adjusted there.

04

The PIR reading always shows zero. Is the sensor faulty?

The PIR detector is an optional feature. Not every PALNM unit ships with the PIR module installed. Check your order specification to confirm whether PIR detection is included in your sensor variant.

Registers (2)

2 read / 0 write

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