Worked example
No result for these values. The message above the form says which field to change.
Complete polling cycle, estimated
ms
- Character time
- ms
- t1.5 inter-character limit
- ms
- t3.5 inter-frame minimum
- ms
- One request and response exchange
- ms
- Complete cycles per minute
- cycles/min
- Share of the exchange spent transmitting bytes
- %
The parity and stop-bit combination follows the 11-bit Modbus serial framing recommendation. Character-derived t1.5 and t3.5 timings are applied.
Underlined figures are rounded. Select one to copy its full value.
Method and assumptions
Formula
tchar = framing bits ÷ baud; texchange = request + max(response delay, t3.5) + response + t3.5At or below 19,200 bit/s, t1.5 and t3.5 follow character time. Above 19,200 bit/s, the serial guide recommends fixed 750 µs and 1.750 ms timers.
Limits of this result
- The cycle estimate excludes retries, timeouts, broadcasts, operating-system scheduling and other masters.
- The entered response delay must represent the device from request end to response start; the calculation enforces at least t3.5.
- This is an ideal sequential estimate with one identically sized exchange per device. Nonconforming 10- or 12-bit framing results are exploratory timing arithmetic, not Modbus conformance approval.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.