Baud
rates supported (not all units): 115200, 57600, 38400, 19200, 9600, 4800 and
2400.
Bit rates (1/baud rate) are 8.68us, 17.36us, 26us, 52us, 104us, 208us and 417us respectively.
The format, as specified by Modicon, is a constant 11 bits per byte
transmitted and received, consisting of 1 start bit, 8 data bits,
1 parity bit and 1 stop bit.
If NO parity bit is used there should be an extra stop bit inserted
in its place (i.e. 1 start bit, 8 data bits and 2 stop bits).
N.B. In more recent units a format of 10 bits is supported,
i.e. 1 start bit, 8 data bits, NO parity bit and 1 stop bit.
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