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Since you specify using bash shell we can flush the input buffer using:

while read -rs -N 1 -t 0.1 2> /dev/null ; do : ; done

so your script would look like this:

#!/bin/bash

for i in 1 2...

Are you attempting to write raw, binary characters to the serial port? You were writing the literal characters 1, 0, 7, ' ', 0, etc.

# Set serial port in raw mode, so binary passes unmangled...

Depending on your shell, a read with timeout 0 might work. In my bash: read -t0 A