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UNO-2174A/2178A User Manual 14

2.5 RS-232/422/485 Selection

COM1 to COM2 support 9-wire RS-232 and RS-485 interfaces. COM3

to COM6 (UNO-2178A) support 4 wire RS-232 and RS-485 interfaces.

COM A and COM B support 9-wire RS-232/422/485 interface. The sys-

tem detects RS-422 or RS-485 automatically for COM A and COM B. To

select between RS-232 or RS-485 for COM1 - COM6, adjust JCOM1 to

JCOM6 accordingly. For COM A and COM B the corresponding jumpers

for RS-232/422/485 selection are JCOM A and JCOM B.

2.5.1 COM1 - 6

Jumper Setting for RS-232 Interface (default)

Figure 2.5: RS-232 Jumper Setting (COM1,2)

Figure 2.6: RS-232 Jumper Setting (COM3-6)

Jumper Setting for RS-485 Interface

Figure 2.7: RS-485 Jumper Setting (COM1,2)

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Advantech UNO-2178A User Manual Page 22