BMR Energy Meters
| Device Type | Modbus TCP (Ethernet) | RS485 |
|---|
| PLA33 | ✅ | ✅ |
| PLA33RX |
Figure 1: Front panel of the PLA33 showing buttons like SET, cursor keys, and ESC.
Figure 2: Front panel of the PLA33RX showing buttons like ESC, cursor keys, and status LEDs for recording and relay outputs.
For RS485 wiring, follow the guidelines for RS485 wiring.
InfoRS485 Wiring
- For correct RS485 wiring: follow the RS485 wiring guidelines.
- If the wiring shown in the table below is incorrect, please let us know.
- There is no general industry consensus on the use of A and B for RS485 polarity, so the naming may be counterintuitive for some devices.
WarningNOTE: RS485 Device Addresses
- You MUST give each device a unique address on the RS485 bus. Check the device manual for instructions.
- Use lower addresses first (1, 2, ...) because the Sofar EMS will find them faster!
- For each device, it is generally recommended to keep the factory-default baud rate, parity, and stop bits. The Sofar EMS will scan those first.
For Ethernet wiring, follow the guidelines for Ethernet wiring.
To configure RS485 communication on BMR energy meters, follow these steps:
-
Set the Modbus Address:
- Access the settings menu by pressing the SET button for 5 seconds.
- Navigate to the communication menu (
P_2) using the cursor keys.
- Set the Id (unique Modbus address) between 1 and 247.
-
Set the Baud Rate:
- In the communication menu (
P_2), configure the bd (baud rate) to match your system. Supported baud rates include 9.6 / 19.2 / 38.4 / 57.6 / 115 kBd.
-
Parity and Stop Bits:
- Configure PAr (parity) as
None, Odd, or Even.
- Set the St (stop bits) to
1 or 2 as needed.
-
RS485 Termination:
- If the meter is the last device on the RS485 bus, add a 120 Ω termination resistor.
WarningNOTE: RS485 Device Addresses
- You MUST give each device a unique address on the RS485 bus. Check the device manual for instructions.
- Use lower addresses first (1, 2, ...) because the Sofar EMS will find them faster!
- For each device, it is generally recommended to keep the factory-default baud rate, parity, and stop bits. The Sofar EMS will scan those first.
For devices with Ethernet capability:
- Ensure the Ethernet cable is properly connected.
- Use the Power Monitoring Software (PMS) to configure the IP address, subnet mask, and gateway.
- Verify that the Modbus TCP port is set to 502.
Last updated August 24, 2026
