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User’s Manual for Advantech SOM-A2558 series module V1.00
25
149
UART4_RXD
I UART5 Receive signal pin.
Pull high
with
100Kohm
150
UART5_RTS O
UART5 Data-Terminal-
Ready
signal pin.
Pull high with
100Kohm
151
UART4_TXD O
UART4 Transmit signal pin.
Pull high with
100Kohm
152
UART5_TXD O
UART5 Transmit signal pin.
Pull high with
100Kohm
153
MSCLK IO
PS/2 mouse clock
Pull high with
10Kohm
154
KBDATA IO
PS/2 keyboard data
Pull high with
10Kohm
155
MSDATA IO
PS/2 mouse data
Pull high with
10Kohm
156
KBCLK IO
PS/2 keyboard clock
Pull high with
10Kohm
157
nVBRIR_INC
O
One of LCD inverter backlight
brightness contro
l signals.
nVBRIR_INC is used to i
ncrease
or decrease Wiper Control.
Advantech suggests to connect the
pin to DS1804 1
st
pin.
No pulling
158
N.C. - N.C. just float this pin. -
159
nVBRIR_UnD
O
One of LCD inverter backlight
brightness control signals.
nVBRIR_UnD is used be
Up/Down
Control. Advantech suggests to
connect the pin to DS1804 2
nd
pin.
No pulling
160
N.C. - N.C. just float this pin. -
161
VBRIR_CS O
One of LCD inverter backlight
brightness control signals.
VBRIR_CS
is used be chip select
pin.
Advantech suggests to
connect the pin to DS1804 7
th
pin.
No pulling
162
N.C. - N.C. just float this pin. -
163
nVCONR_INC
O
One of STN LCD contrast control
signals. nVCONR_INC
is used be
increase/decrease Wiper Control
pin
. Advantech suggests to
connect the pin to DS1804 1
st
pin.
No pulling
164
N.C. - N.C. just float this pin. -
165
VCONR_CS O
One of STN LCD contrast control
signals. VCONR_CS
is used be
chip select pin
. Advantech
suggests to connect the pin to
DS1804 7
th
pin.
No pulling
166
N.C. - N.C. just float this pin. -
167
VCONR_UnD
O
One of STN LCD contrast control
signals.
VCONR_UnD is used be
No pulling