SCADA Polling Collision Predictor

Calculate physical transmission time to prevent Modbus RTU timeout errors and buffer overflows.

Absolute Minimum Physical Time Required
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Is your Gigabit SCADA too fast for your serial bus?

Increasing the SCADA timeout setting is only a band-aid that freezes your monitoring software. The architectural solution is to decouple the networks using Hardware Edge Caching.

Single Bus Edge Caching Sub-3ms Response
1CH Modbus Storage Gateway

Autonomously polls the RS485 loop at safe serial speeds and caches data in memory. Answers host queries instantly.

āœ” Power: 9~24V DC Wide Input
āœ” Function: Storage Modbus Gateway
āœ” Installation: DIN-Rail Supported
Request Eval 1CH Gateway ā†’ šŸ“„ Download Specs
Multi-Host Arbitration 3000V Isolated
4CH/8CH Storage Gateways

Eliminate RS485 bus collisions. Allows multiple computers to access the same serial device simultaneously via Ethernet.

āœ” Isolation: 3000V Opto-isolated (VI Series)
āœ” Feature: Multi-Host Simultaneous Access
āœ” Cache: Storage Modbus Gateway
View Multi-Port Gateways ā†’ šŸ“„ Download Specs

Struggling with Windows Virtual COM Driver BSODs or Jitter?

Don’t let OS timing lag ruin your data logging. Discuss your Modbus topology with our OT applications engineering team and select the exact gateway architecture for zero packet loss.

View Modbus RTU Timing Math & Formulas +
1. Character Time: Standard Modbus RTU uses 11 bits per character (1 start, 8 data, 1 parity/none+stop, 1 stop).
2. Request Frame: Master query is fixed at 8 bytes.
3. Response Frame: Slave response is 5 bytes + (Registers Ɨ 2 bytes).
4. Silent Intervals: Modbus standard requires a 3.5 character silence between frames (7 characters total per round trip).
Formula: Total Time = [(8 + Response Bytes + 7) Ɨ 11 bits / Baud Rate] Ɨ 1000 + Slave Processing Delay.

Engineering debugging tools developed for OT professionals by Valtoris.
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