BMR | SmartgridOne Documentation

Supported Devices

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 .

For correct RS485 wiring: Follow the guidelines for RS485 wiring.
If the wiring shown in the table below is incorrect, please let us know.
There is no general consensus in the industry about the usage of A and B for the RS485 polarity, so it may be counterintuitive and opposite of what you might expect for some devices.

Device	SmartgridOne Controller model OM1	SmartgridOne Controller model IG8	RS485-USB converter	RS485-Ethernet converter
A	RS485 A	RS485_POS	RS485 A	TX+
B	RS485 B	RS485_NEG	RS485 B	TX-
GND	RS GND	GND	Not available	G

You MUST give each device on the RS485 bus a unique address. Check the manual of the device on how to do this.
Use lower addresses first (1, 2, ...) because the SmartgridOne Controller will find them faster!
For each device, it is generally recommended to stick with the factory default baud rate, parity, and stop bits. The SmartgridOne Controller will scan on those first.

For Ethernet wiring, follow the .