AM335X-PAC Series User Manual version 2.0.1 Page: 42
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2.7.3. Introduction to Serial port for LP-8x2x
Figure 2.7.3-1 illustrates the ports contained on the LP-8821 and Figure 2.7.3-2 illustrates those on
the LP-8121. The information is organized as follows:
ttyO4─ Internal communication with the I
-87KW modules in slots
ttyO5
─ RS
-232 (RxD, TxD and GND); Non-isolation; Console
ttyS0 ─ RS
-485 (D2+, D2-; self-tuner ASIC inside)
ttyS1 ─ RS
-232/RS-485
(RXD, TXD, CTS, RTS and GND for RS-232, Data+ and Data- for RS-485)
ttyS34 ─ RS
-232
(RXD, TXD, CTS, RTS, DSR, DTR, CD, RI and GND)
Device name
Definition in LP-8x21 SDK
Default baudrate
ttyO4
COM1
115200
ttyO5 (RS-232/console)
None
115200
ttyS0 (RS-485)
COM2
9600
ttyS1 (RS-232/485)
COM3 (LP-8421/8821 only)
9600
ttyS34 (RS-232)
COM36 (LP-8421/8821 only)
9600
Figure 2.7.3-1.
Serial port mapping on the LP-8821
