SCADABR 1.1 does not list the Arduino UNO serial device ttyACM0 for Modbus serial communication in the reported Linux setup. The available evidence attributes this behavior to a Modbus serial defect or serial support not being enabled in that release; it does not identify an Arduino configuration error.
Identify the SCADABR 1.1 limitation
The reported symptom is specific: ttyACM0 is unavailable for selection in SCADABR 1.1. Two explanations appear in the evidence: serial communication is not enabled in version 1.1, or its Modbus serial implementation contains a bug. Because no official release note or corrected build identifier is supplied, treat the precise internal cause as unconfirmed.
| Observed condition | Evidence-supported interpretation | Decision |
|---|---|---|
SCADABR 1.1 does not show ttyACM0
|
Reported Modbus serial defect or unavailable serial support | Do not assume the Arduino is the root cause |
| Serial operation is required now | The 0.9x branch is reported to enable at least one serial port | Evaluate 0.9x as a workaround |
| A later corrected release becomes available | A future release was expected to restore Modbus serial operation | Retest before migrating the application |
Choose a supported decision path
If serial communication is required immediately, evaluate SCADABR 0.9x because the evidence reports that it can enable at least one serial port. If changing versions is unacceptable, the evidence provides no configuration change that makes ttyACM0 appear in version 1.1; defer serial commissioning until a corrected release is available.
Apply and verify the workaround
- Preserve the existing SCADABR 1.1 project before evaluating another branch.
- Install or test the 0.9x branch in a controlled environment.
- Open its serial configuration and verify that a serial port can be selected.
- Select the Arduino-connected port only if it appears, then verify Modbus data exchange using the existing application configuration.
Successful verification requires more than seeing a port entry: confirm that SCADABR exchanges Modbus data with the Arduino. If 0.9x also fails to expose a usable port, the evidence does not support a further product-specific correction.
Plan the return to a corrected release
No corrected SCADABR version, firmware dependency, parameter, or release date is identified. Before returning to the 1.1 line or a later build, confirm that its release information explicitly addresses Modbus serial operation, then repeat port discovery and end-to-end data-exchange tests.
FAQ
Why does SCADABR 1.1 not show ttyACM0?
The available evidence reports either unavailable serial support or a Modbus serial bug in SCADABR 1.1. It does not establish an Arduino UNO fault.
Which SCADABR version can expose a serial port?
The 0.9x branch is reported to enable at least one serial port. Test it in a controlled environment and verify actual Modbus data exchange.
Is there a setting that fixes Modbus serial in SCADABR 1.1?
No corrective setting is supplied in the evidence. The supported choices are to evaluate 0.9x or wait for a release that explicitly corrects Modbus serial operation.