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3.2.15 UART Ports
The Eagle Eyes-AIHD / AIHD-P4E / AIHD-GP4E series provides two
RS-232/422/485 ports and four RS232 ports for communicating with external
devices. COM1 - COM6 are located on the I/O panel via 9-pin D-Sub male
connectors. COM1 and COM2 can be configured for full RS232, RS422, or RS485
with auto flow control communication. Mode selection is by BIOS or eKit tools. The
default definition is RS232.
Each of the serial ports individually contains a programmable baud rate generator,
which can divide the input clock by a number ranging from 1 to 65535. The data rate
of each serial port can be programmed from 115.2K baud (COM1 baud rate up to
912.6Kbit/s) and down to 50 baud. The character options are programmable for one
start bit; 1, 1.5 or 2 stop bits; even, odd, stick or no parity; and privileged interrupts.
Each port supports 128 bytes RX FIFO depths and 16 bytes TX FIFO depths.
All transmitter outputs and receiver inputs feature robust electrostatic discharge (ESD)
protection to ±15kV Human Body Model (HBM) and ±8kV IEC- 61000-4-2 Contact.
Each receiver output has full fail-safe protection to avoid system lockup, oscillation,
or indeterminate states by defaulting to logic-high output level when the inputs are
open, shorted, or terminated, but undriven.
The following table describes the pin definition of UART ports.
COM1, COM2
UART Mode
D-Sub 9 Male
COM1, COM2
RS-232
Pin 1
DCD#
Pin 2
RxD
Pin 3
TxD
Pin 4
DTR#
Pin 5
GND
Pin 6
DSR
Pin 7
RTS#
Pin 8
CTS#
Pin 9
RI#/+12V/+5V
27
Eagle Eyes-AIHD User Manual
RS-422
RS-422
(5-wire)
(9-wire)
TxD-
TxD-
TxD+
TxD+
RxD+
RxD+
RxD-
RxD-
GND
GND
N/A
RTS-
N/A
RTS+
N/A
CTS+
N/A
CTS-
RS-485
(3-wire)
Data-
Data+
N/A
N/A
GND
N/A
N/A
N/A
N/A
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