A telegram octet refers to the 8 bits representing the actual useful information.
A telegram serial character refers to all bits required in order to sent a telegram octet to the bus.
A telegram serial character for TP1 has a length of 11 bits = 8 bits from the telegram octet + 3 additional bits.
These 3 additional bits for TP1 are:
- 1 start bit, sent before the LSB of the telegram octet
- 1 even parity bit, sent after the MSB of the telegram octet
Also known as the vertical parity check
- 1 stop bit, sent after the even parity bit