Configuring the Delta OHM BAROsense Barometric Transmitter using the RS485 serial output involves using either its proprietary protocol or the MODBUS-RTU protocol. Here's a guide to adjusting key settings:
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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 device.
- To revert to MODBUS-RTU, 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 output, depending on the IOUT / VOUT jumper setting on the device's board.
- To enable or disable the current analog output offset, send the command "CAOn", with "n" as 0 to disable or 1 to enable.
- To set the correspondence between the current analog output and pressure, either direct or reversed, use the command "CASOn". "n" is 0 for direct or 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. Please consult the Delta OHM BAROsense manual for conversion factors.
For more detailed instructions and a full list of commands, please refer to the Delta OHM BAROsense Barometric Transmitter Instruction Manual or contact Delta OHM directly for further assistance.
