Telit Wireless Solutions ME310G1 - Asynchronous Serial Port (USIF0)

ME310G1 Hardware Design Guide
1VV0301588 Rev. 16 Page 43 of 95 2021-10-27
Not Subject to NDA
5.7.3.1.Asynchronous Serial Port (USIF0)
The serial port 0 on the Telit ME310G1 module is a +1.8V UART with 5 RS232 signals.
It differs from the PC-RS232 in signal polarity (RS232 is reversed) and levels.
The following are the available signals:
RS232
Pin
Signal
Pad
Name
Usage
2
C104/RXD0
AA15
Transmit
line
Output transmit line of ME310G1
UART
3
C103/TXD0
Y16
Receive
line
Input receive of the
ME310G1 UART
Pull-up default during ON state
4
DTR
(*)
Data
Terminal
Ready
Input to the ME310G1 that
controls the DTE READY
condition
5
GND
A3, A7, A9, A13, A17, B4, B6, B10, B12, B14,
B16, C19, D18, F8, F12, F18, G19, H6, H14,
J19, K18, M18, N19, P6, P14, T8, T12, U1, V2,
W19, Y2, Y4
Ground
Ground
8
C106/CTS0
AA17
Clear to
Send
Output from the ME310G1 that
controls the Hardware flow
control
7
C105/RTS0
Y18
Request
to Send
Input to the ME310G1 that
controls the Hardware flow
control
Pull-up default during ON state
9
RING
(*)
Ring
Indicator
Output from the ME310G1 that
indicates the incoming call
condition
Table 29: Available signs * For alternate GPIO functions, refer to General Purpose I/O
Note: According to V.24, some signal names refer to the application
side, so on the ME310G1 side these signals are in the opposite
direction:
TXD on the application side is connected to the receiving line (here
named C103/TXD0)
RXD on the application side is connected to the transmit line (here
named C104/RXD0)
For reduced implementation, only the TXD, RXD lines can be
connected, the other lines can be left open.