Advantech UNO-127, Руководство пользователя

Страница: 40 / 44

UNO-127 User Manual 30
A.7.3 COM Port RS422/485 Termination Resistor Setting
A.8 AT/ATX Setting (PSON1)
PSON1 using jumper for setting AT/ATX mode. The default setting is AT mode. See
the follow- ing table for jumper installation for mode.
SW1 Termination Resistor setting
Description
This switch is used to select Termination Resistor (120 ohm) for long
distance transmissions or device matching.
Default Bit3 off & Bit8 off
COM1 Bit3 on
COM2 Bit8 on
SW2 Termination Resistor setting
Description
This switch is used to select Termination Resistor (120 ohm) for long
distance transmissions or device matching.
Default Bit3 off & Bit8 off
COM3 Bit3 on
COM4 Bit8 on
Default
PIN 1 2 3
Description Instruction PSON1
ATX Mode Closed 2-3
AT Mode (Default)
Closed 1-2