Serial Line Timing
Character format
Bits per character
11
Character time
1.1458 ms
Characters per second
872.7 B/s
t1.5
1.7188 ms
t3.5
4.0104 ms
Request / response cycle
One character = start + data + parity + stop bits. An 8-byte Modbus request takes 9.17 ms at this format. Modbus RTU: gaps inside a frame ≤ t1.5, between frames ≥ t3.5.