9
Chapter 2
16C954 UARTs with 128-byte Standard
Advantech UNO-2050E comes standard with Oxford OX16PCI964
UARTs containing 128 bytes FIFOs. These upgraded FIFOs greatly
reduce CPU overhead and are an ideal choice for heavy multitasking
environments.
Automatic Data Flow Control Function for RS-485
In RS-485 mode, UNO-2050E automatically senses the direction of
incoming data and switches its transmission direction accordingly. There-
fore no handshaking signal (e.g. RTS signal) is necessary. This feature
lets you simply and quickly build an RS-485 network with just two wires.
More importantly, application software previously written for half duplex
RS-232 environments can be maintained without need for modification.
IRQ and Address Setting
The IRQ and I/O address range are both assigned by BIOS. COM3,
COM4 serial ports and on-board digital I/O use the same IRQ.
2.4 Onboard Isolated Digital Input
The UNO-2050E has 8 isolated digital input channels designated
DI0~DI7.
Pin Assignments
The connector type of UNO-2050E is plug-in screw terminal block that
enables you to connect to field I/O devices directly without additional
accessories. Figure 2-3 and Table 2-2 shows its pin assignment as well as
signal description.
Figure 2.3: Digital Input Connector Pin Assigns
D
I
0
D
I
1
D
I
2
D
I
3
C
O
M
D
I
4
D
I
5
D
I
6
D
I
7
Isoated DI
