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9 Chapter 2

2.3 COM3~COM4: RS-232/422/485 Interfaces

The UNO-2059E offers two RS-232/422/485 serial communication inter-

face port, and they are COM3 and COM4. Each port can be configured

individually to either RS-232, RS422/485 by using on-board jumpers.

(See Appendix A.3) and Table 2-2 lists the default setting of each port.

16C954 UARTs with 128-byte standard

Advantech UNO-2059E 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.

Jumpless for RS-422/485

In RS-422/485 mode, UNO-2059E automatically sense signals to match

RS-422 or RS-485 network.

Automatic Data Flow Control Function for RS-485

In RS-485 mode, UNO-2059E 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, and four

serial ports use the same IRQ.

Table 2.2: COM3 & COM4 Default Settings

COM Port Default Setting

COM3 RS-422/485

COM4 RS-422/485

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 37 38

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