Hi larzazral,

With SERIN2, the DEC modifier needs a non-numeric character to indicate the end of the number.
Or, it needs to know how many digits to expect.

As it is, the next non-numeric character is the "A" from the next packet, so that A (and it's data) are discarded, and it waits for the packet after that.
Which makes it only receive every other packet.

Either this on the transmit side ...
Code:
SEROUT2 PORTD.1,16468,["A",DEC I,";"]
OR, this on the receive side ...
Code:
SERIN2 PORTC.3,16468,[WAIT("A"),DEC1 I]
Should get you going.