How do I configure the Delta OHM BAROsense Barometric Transmitter using its RS485 serial output?

[SanRyan]

Configuring the Delta OHM BAROsense Barometric Transmitter via RS485 serial communication allows you to customize its behavior. You can use either the proprietary protocol or the MODBUS-RTU protocol. Here's how to adjust key settings:

1. Changing the Operating Protocol:

   • By default, the transmitter uses MODBUS-RTU. To switch to the proprietary protocol, send the command "@" within 10 seconds of powering on the instrument.
   • To set the protocol to MODBUS-RTU, send the command "DP1".

2. Setting the Measurement Interval:

   • The default measurement interval is 1 second. To change it, send the command "MTn", where "n" represents the desired interval in seconds (1 to 30).

3. Configuring the Analog Output:

   • The analog output can be current or voltage, depending on the IOUT / VOUT jumper configuration on the board.
   • To enable or disable the offset of the current analog output, use the command "CAOn", where "n" is 0 (disable) or 1 (enable).
   • To set the correspondence between the current analog output and pressure (direct or reversed), send the command "CASOn", where "n" is 0 for direct correspondence and 1 for reversed.
   • To set the minimum and maximum pressure values for the current analog output, use the commands "CALn" and "CAHn", respectively. "n" represents the desired value in the set unit of measurement. Consult the Delta OHM BAROsense manual for conversion factors.

For detailed command explanations and comprehensive instructions, always refer to the official Delta OHM BAROsense Barometric Transmitter Instruction Manual. If you need further assistance, don't hesitate to contact Delta OHM directly.