Advantech UNO-2178A Bedienungsanleitung PDF herunterladen (Seite 20)

UNO-2174A/2178A User Manual 12

2.3.1 16C550 UARTs with 128-byte standard

Advantech UNO-2174A/2178A comes with OXuPCI952 UARTs con-

taining 128 bytes FIFOs. These upgraded FIFOs greatly reduce CPU

overhead and are an ideal choice for heavy multitasking environments.

2.3.2 RS-422/485 detection

In RS-422/485 mode, UNO-2174A/2178A automatically detects signals

to match RS-422 or RS-485 networks. (No jumper change required)

2.3.3 Automatic Data Flow Control Function for RS-485

In RS-485 mode, UNO-2174A/2178A automatically detects the direction

of incoming data and switches its transmission direction accordingly. So

no handshaking signal (e.g. RTS signal) is necessary. This lets you con-

veniently build an RS-485 network with just two wires. More impor-

tantly, application software previously written for half duplex RS-232

environments can be maintained without modification.

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Advantech UNO-2178A Bedienungsanleitung Seite 20