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7
Isolated DI bit6
8
Isolated DI bit7
9
Digital Input COM
10
Isolated GND
3.2.15 UART Ports
The Eagle Eyes-AIHD/AIHD-P4E/AIHD-GP4E series provides two
RS-232/422/485 ports and four RS-232 ports for communicating with external
devices. COM1~COM6 are located on the I/O panel via 9-pin D-Sub male
connectors. COM 1/2 can be configured for full RS-232, RS-422 or RS-485
with auto flow control communication. Mode selection is by BIOS or Ekit tools,
the default definition is RS-232.
Each of the serial ports individually contains a programmable baud rate
generator which is capable of dividing 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 1 start bit; 1, 1.5 or 2 stop bit; 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
Eagle Eyes-AIHD User Manual
17
Isolated DO bit6
18
Isolated DO bit7
19
Isolated GND
20
Isolated VCC
RS-422
RS-422
(5-wire)
(9-wire)
TxD-
TxD+
RxD+
RxD-
GND
-
-
-
-
27
RS-485
(3-wire)
TxD-
Data-
TxD+
Data+
RxD+
-
RxD-
-
GND
GND
RTS-
-
RTS+
-
CTS+
-
CTS-
-
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