LENA-R8 series - System integration manual
UBX-22015376 - R02
System description
Page 11 of 116
C1-Public
Function Pin name
Pin no.
I/O Description
Remarks
Cellular
UART
RXD
13
O
Cellular UART data
output
1.8 V output, UART Circuit 104 (RXD) per ITU-T V.24,
supporting AT and data, FOAT, Multiplexer.
Test-Point and series 0
for diagnostic to be considered.
See section
for functional description.
See section
for external circuit design-in.
TXD
12
I
Cellular UART data
input
1.8 V input, UART Circuit 103 (TXD) per ITU-T V.24,
supporting AT and data, FOAT, Multiplexer.
Internal active pull-up to V_INT.
Test-Point and series 0
for diagnostic to be considered.
See section
for functional description.
See section
for external circuit design-in.
CTS
11
O
Cellular UART clear
to send output
1.8 V output, UART Circuit 106 (CTS) per ITU-T V.24.
See section
for functional description.
See section
for external circuit design-in.
RTS
10
I
Cellular UART ready
to send input
1.8 V input, UART Circuit 105 (RTS) per ITU-T V.24.
Internal active pull-up to V_INT.
See section
for functional description.
See section
for external circuit design-in.
DSR
6
O
Cellular UART data
set ready output
1.8 V output, UART Circuit 107 (DSR) per ITU-T V.24.
Alternatively configurable as AUX UART RTS input.
See section
for functional description.
See section
for external circuit design-in.
RI
7
O
Cellular UART ring
indicator output
1.8 V output, UART Circuit 125 (RI) per ITU-T V.24.
Alternatively configurable as AUX UART CTS output.
See section
for functional description.
See section
for external circuit design-in.
DTR
9
I
Cellular UART data
terminal ready
input
1.8 V input, UART Circuit 108/2 (DTR) per ITU-T V.24.
Internal active pull-up to V_INT.
Alternatively configurable as AUX UART data input.
See section
for functional description.
See section
for external circuit design-in.
DCD
8
O
Cellular UART data
carrier detect
output
1.8 V input, UART Circuit 109 (DCD) per ITU-T V.24.
Alternatively configurable as AUX UART data output.
See section
for functional description.
See section
for external circuit design-in.
Cellular
Auxiliary
UART
DCD
8
O
Cellular AUX UART
data output
1.8 V output, AUX UART Circuit 104 (RXD) per ITU-T V.24,
supporting AT, data communication and GNSS tunneling.
The second auxiliary UART interface is disabled by
default, and it can be enabled by +USIO AT command.
See section
for functional description.
See section
for external circuit design-in.
DTR
9
I
Cellular AUX UART
data input
1.8 V input, AUX UART Circuit 103 (TXD) per ITU-T V.24,
supporting AT, data communication and GNSS tunneling.
Internal active pull-up to V_INT.
The second auxiliary UART interface is disabled by
default, and it can be enabled by +USIO AT command.
See section
for functional description.
See section
for external circuit design-in.
RI
7
O
Cellular AUX UART
clear to send output
1.8 V output, AUX UART Circuit 106 (CTS) per ITU-T V.24.
See section
for functional description.
See section
for external circuit design-in.
DSR
6
I
Cellular AUX UART
ready to send input
1.8 V input, AUX UART Circuit 105 (RTS) per ITU-T V.24.
Internal active pull-up to V_INT.
See section
for functional description.
See section
for external circuit design-in.
