10 Communication
Analog I/O Data Ranges
Analog inputs and outputs for your device were calibrated at the factory.
By default, the full scale flow range maps 1:1 to the full scale voltage or
current range of your device with a small overrange allowed.
Custom analog ranges may also be set from the factory. Factory custom
analog ranges will be listed on the calibration sheet.
The full scale range for density on CODA devices is 0–2000 kg/m ³. The
CODA device is not sensitive enough to detect most gas densities, so it
will always output a density reading of 99 kg/m ³ or higher.
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Note:
The density readings and accuracy are independent of
mass flow readings and accuracy.
!
Warning:
Do not connect this device to “loop powered”
systems, as this will destroy portions of the circuitry. If you
must interface with existing loop powered systems, always
use a signal isolator and a separate power supply.
Serial Communication
All CODA devices come with a digital serial interface, in addition to the
analog interface. Modbus RTU is the default communications protocol for
KM-Series meters. You can read and log sensor data and adjust device
settings via these serial interfaces.
Establishing Communication
You can access the CODA serial interface through the USB port, 15-pin, or
8-pin connectors on top of the device. Consult the pinouts on
for information on how to wire a connector for CODA.
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If you have used a USB cable to connect your device to a
computer running Windows 10, it should recognize your
USB as a virtual COM port automatically. If not, please
ensure your computer has the latest updates.
•
Once you have physically connected your device to a Windows PC,
you can check which COM port number it is using by opening the
Windows Device Manager and expanding "Ports (COM & LPT)".
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The CODA device will be configured with the following settings:
·Data Bits: 8
·Stop Bits: 1
·Parity: None
·Flow Control: None
·Modbus ID: 1
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The 15-Pin and 8-Pin connectors come pre-configured with a
baud rate of 19.2 kbps. The USB-C serial interface will autodetect
and accept any arbitrary rate from 9.6 kbps to 12 mbps.
