Real Numbers (Part 2) - Modbus/RTU over cellular

My previous post covered Modbus/RTU polls once per 30 seconds. Here is a second set of results for 24 hours with polling once every 60 seconds.

• Of 1440 polls, only 3 failed responses with a 30 sec timeout.
• Fastest poll was 451 msec round-trip (1/2 sec)
• Slowest poll was 10,407 msec round-trip (10.5 sec)
• Statistical average of successful polls was 1748 msec
• In chart below, white dots are round-trip times and black line is the moving average over a 15-minute period.
• Notice a few interesting trends; such as the very fast response around 11am and again around 3am the next morning.

(Click the image to see a large version)
(Click here to download ZIP file with Excel and OpenOffice spreadsheet of times)