Read M-Bus meters over RS232

The following list instructs how to configure a PiiGAB M-Bus 900/900S so that M-Bus meters can be read with RS232.

1. Start the gateway’s web interface in any web browser.
2. Go to the Configuration page.
3. Select any slave port for the RS232 communication.
4. Specify the following parameters:
   • Type: Serial.
   • Com port: RS-232.
   • Baud rate: The specified communication speed on the RS232 bus.
   • Bit Number: Number of data bits on the RS232 bus.
   • Parity: The parity for the RS232 bus.
   • Stop Bit: Number of stop bits on the RS232 bus.
   • Timeout: Expected time to get answer from the M-Bus meter.
   • Protocol: The data protocol on the RS232 bus.
5. Press the Save settings.
6. Connect the RS232-cable to the RS232-connection on the gateway:
   • PiiGAB M-Bus 900: Pins 10-12.
   • PiiGAB M-Bus 900S: Pins 11-13.

The picture shows Slave port 2 is configured for RS232 on 2400 baud, 8 data bits, even parity, 1 stop bit, 2000ms as timeout and M-Bus communication.

Note:

• Make sure the gateway doesn’t use the RS232-port anywhere else. For instance any other slave ports or the Modbus2MBus and/or the Wireless applications.
• The RX and TX pins should likely go to the opposite pins on the unit.
  Exempelvis: RX->TX och TX->RX.