52 Rockwell Automation Publication 5069-UM003B-EN-P - January 2020
Chapter 3 Compact 5000 I/O Serial Module Features
turnaround time of the modem is 50 ms (which will vary by modem) you would
choose to use the RTS Send Delay time of 60 ms for your calculation.
Having determined the maximum message transmission time (224 ms), the
average slave program scan time (20 ms) and the largest of either RTS Send Delay
(60 ms) or the modem turnaround time, the minimum ACK timeout is simply
the sum of these values.
Parameter Example Values (in ms)
Max message transmission time 224
Average program scan time 20
RTS Send Delay 60
Use only the largest of
these two values
modem turnaround time 50
calculated ACK Timeout 304
round up to nearest 20 ms 320
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