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7938: Connect rs485 dc meter

+1 vote
1,067 views
in Vehicle tracking by anonymous
Hello!

Is it possible to connect an Rs485 dc voltage ammeter like this https://m.made-in-china.com/product/Factory-Supply-Newest-Pzem-017-DC-0-300V-100A-Modbus-Energy-Meter-RS485-with-100A-Shunt-857710545.html

to the FMB125 or similar to send battery voltage and current flow of an external golf car battery along with the gps data to the server.

Thanks in advance!

1 Answer

0 votes
by anonymous

Hello,

Thank you for your query,

If connected to the vehicle's battery the FMB device sends the battery level of vehicle as parameter "external voltage". 

If required various RS485 external devices can be also connected to FMB125.

RS-485 supports only half-duplex communication, which means data is transferred only one way at a time.

When activated RS-485 driver chip draws constant 30mA current, when entering Sleep or Deep sleep RS-485 will be powered off.

RS-485 modes:

  • RS-485 receive (FMB silent) mode: RS485 Works in receive mode. Support debug and testing commands. When command is received answer is sent after that it back up to Receive mode.
  • RS-485 transmit (FMB log) mode: RS-485 prints FMB device log and does not respond to commands.
  • RS-485 transmit (NMEA) mode: RS-485 prints GNSS NMEA log and does not respond to commands.
  • RS-485 receive (LLS) mode: This mode supports up to five LLS fuel level sensors each of which has a receiver ID.
  • RS-485 TCP receive (ASCII/Binary) modes: In TCP ASCII/Binary mode a link with an external device using text messages can be established. Buffered modes save information until link with server is established and records are sent.
  • RS-485 receive (TCP ASCII/Binary Buffered) mode :RS485 works in receive mode. When data received from server RS-485 is switched to transmit mode. If data server is not available, data will be saved in buffer.

In your case it would be possible to connect the energy meter via RS-485 and sends it's data via TCP link mode, in this mode the data is sent directly to the server, the parsing and managing of data received should be done in the server side.

Regards.

Best answer
by anonymous
Thanks for the detailed response. We plan to monitor the current flow/amperage and not the external voltage. Would that be possible?

Also can a similar meter be connected to the analog input? Thanks in advance.