initialised timer so that the first print happens immediately
Was using modbus_read_registers() : this is wrong. Uses function
code 0x03, which reads the holding registers. We want to read the
input registers, function code 0x04, which can be done using
modbus_read_input_registers().
Also fixed the main (0 - READ_COUNT) for loop, now using sane
values. D'oh.
Merge branch 'master' of https://github.com/eriknyquist/modbus
added some comments