u-blox Malmo AB 000501 사용자 설명서
8
2.3 UART-communication
The “Mode 0” pin (see General Purpose I/O) selects if the UART-communication is
with RS232 levels or logic level. “Mode 0” cannot be changed during operation.
with RS232 levels or logic level. “Mode 0” cannot be changed during operation.
RS232 level UART-communication
Mode 0 = H during power up, RS232 level UART-communication selected.
Pin nr.
Pin Name
Type Description
Level
14
CTSA
15
RXA
13
RTSA
16
TXA
Do NOT connect these pins.
When UART-communication with RS232 signal
levels is enabled this signals are used internally.
RS232 is enabled when Mode 0 (J1 pin nr: 10) is
left open or held high during power up.
When UART-communication with RS232 signal
levels is enabled this signals are used internally.
RS232 is enabled when Mode 0 (J1 pin nr: 10) is
left open or held high during power up.
33
RS232-
DSR
DSR
Input
Data Set Ready
RS232
34
RS232-RX
Input
Receive data
RS232
37
RS232-
CTS
CTS
Input
Clear To Send
RS232
35
RS232-
RTS
RTS
Output
Request to Send
RS232
36
RS232-TX
Output
Transmit data
RS232
38
RS232-
DTR
DTR
Output
Data Terminal Ready RS232
Logic level UART-communication
Mode 0 = L during power up, Logic level UART-communication selected.
Pin nr.
Pin Name
Type
Description
Level
14
CTSA
Input
Clear To Send
0V/3,3V
15
RXA
Input
Receive data
0V/3,3V
13
RTSA
Output
Request to Send
0V/3,3V
16
TXA
Output
Transmit data
0V/3,3V
33
RS232-DSR
Input
34
RS232-RX
Input
37
RS232-CTS
Input
Inputs accepts RS232 voltage levels but
are internally disconnected from the
UART when UART-communication with
logic level is enabled
are internally disconnected from the
UART when UART-communication with
logic level is enabled
35
RS232-RTS
Output
36
RS232-TX
Output
38
RS232-DTR
Output
Although output drivers are active
specific output levels can not be
guaranteed when UART-communication
with logic level is enabled
specific output levels can not be
guaranteed when UART-communication
with logic level is enabled