Configuring your Delta OHM BAROsense Barometric Transmitter using the RS485 serial output involves a few key steps. You can utilize either the proprietary protocol or the MODBUS-RTU protocol. Here's how to adjust settings like the operating protocol, measurement interval, and analog output:
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Changing the Operating Protocol:
- By default, the transmitter operates with the MODBUS-RTU protocol. To switch to the proprietary protocol, send the command "@" within 10 seconds of powering on the instrument.
- To revert to the MODBUS-RTU protocol, send the command "DP1".
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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, ranging from 1 to 30.
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Configuring the Analog Output:
- The analog output can be configured for current or voltage, depending on the IOUT / VOUT jumper setting 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), use the command "CASOn", where "n" is 0 for direct correspondence and 1 for reversed correspondence.
- To define the minimum and maximum pressure values for the current analog output, use the commands "CALn" and "CAHn", where "n" is the desired value in the appropriate unit of measurement (refer to the Delta OHM BAROsense manual for conversion factors).
For more detailed instructions and a comprehensive list of commands, please consult the Delta OHM BAROsense Barometric Transmitter Instruction Manual or contact Delta OHM directly for further assistance.
