Advantech UNO-3074 Manuel d'utilisateur télécharger pdf (Page 23)

13 Chapter 2

2.2 RS-232 Interface (COM1~COM2)

The

UNO-3074 offers two

industrial standard

RS-232 serial communica-

tion

interface ports:

COM1

and COM2. Please

refer to

Appendix A.4

for

their pin

assignments.

The IRQ and I/O address range

COM1 and COM2

are

listed below:

COM1: 3F8

IRQ4 COM2: 2F8

IRQ3

2.3 RS-232/422/485 Interface (COM3~COM4)

The UNO-3074

offers

two industrial RS-232/422/485 serial

communica-

tion interface

ports: COM3 and

COM4. Please refer to

Appendix A.5 for

their

pin assignments.

The default setting of

COM3 and COM4

are

RS-

422/485. (Please refer to section 2.3.4 for how to determine RS-232 or

RS-422/485)

2.3.1

16C550 UARTs

with 16-byte FIFO Standard

Advantech

UNO-3074 comes

with 16C550 UARTs

containing 16 bytes

FIFOs.

2.3.2

RS-422/485 Detection

In RS-422/485 mode,

UNO-3074

automatically detects signals

to match

RS-422 or

RS-485 networks.

(Refer to section 2.3.5)

2.3.3

Automatic Data Flow Control Function for RS-485

In RS-485 mode, UNO-3074 automatically detects the direction of incom-

ing data

and

switches its transmission direction accordingly. So

no hand-

shaking signal

(e.g. RTS

signal)

is necessary. This lets you easily build an

RS-485 network

with Data+, Data- and Ground. More

importantly, appli-

cation

software previously written for full-duplex RS-232

environments

can be maintained without

modification.

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Advantech UNO-3074 Manuel d'utilisateur Page 23

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