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2.14. General Purpose Serial Interface
Two TTL compatible two wire asynchronous serial ports are available on Module Types 7. This feature is
introduced in COM.0 Revision 2 and uses pins on the A-B connector that have been re-claimed from the A-B
VCC_12V pool.
Any of the Module asynchronous serial ports, if implemented on an Intel X86 architecture Module platform,
should be I/O mapped serial ports that are register compatible with the National Semiconductor 16550 UARTs
that were used in the PC AT architecture. The Module asynchronous serial ports are intended for general
purpose use and for use with debugging software that make use of the “console redirect” features available
in many operating systems. The Module asynchronous serial ports
should not be implemented as USB
peripherals, as such implementations are generally not useful for low level debug purposes.
2.14.1 Serial interface Signal Definitions
Table 39
: Serial interface Signal Definitions
Signal
Pin#
Description
I/O
Note
SER0_TX A98
Transmit Line for Serial Port 0
Carrier Board:
connect to
Device - TXD
COM DB-9 port - TxIN of Serial Transceiver and TxOUT to DB-9 pin 3 TXD
N/C if not used.
O
CMOS
SER0_RX A99
Receive Line for Serial Port 0
Carrier Board:
Connect to
Device - RXD
COM DB-9 port - TxOUT of Serial Transceiver and TxIN to DB-9 pin 2 RXD
N/C if not used
I
CMOS
SER1_TX
/
CAN_TX
A101
Transmit Line for Serial Port 1
Carrier Board:
connect to
Device - TXD
COM DB-9 port - TxIN of Serial Transceiver and TxOUT to DB-9 pin 3 TXD
N/C if not used.
O
CMOS
SER1_RX
/
CAN_RX
A102
Receive Line for Serial Port 1
Carrier Board:
Connect to
Device - RXD
COM DB-9 port - TxOUT of Serial Transceiver and TxIN to DB-9 pin 2 RXD
N/C if not used
I
CMOS
Note:
