Telit Wireless Solutions ME910G1 - Serial Ports; Modem Serial Port 1 (USIF0)

ME910G1 Hardware Design Guide
1VV0301593 Rev.12 Page 46 of 93 2021-09-24
Not Subject to NDA
Serial Ports
The ME910G1 module is provided with by 2 Asynchronous serial ports:
• MODEM SERIAL PORT 1 (Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• microcontroller UART @ 5V or other voltages different from 1.8V
Depending on the type of serial port on the OEM hardware a level translator circuit may
be needed to operate the system. The ports on the ME910G1 the port are CMOS 1.8.
Modem Serial Port 1 (USIF0)
The serial port 1 on the ME910G1 is a +1.8V UART with all the 7 RS232 signals. It differs
from the PC-RS232 in the signal polarity (RS232 is reversed) and levels.
The following table lists the available signals:
RS232
Pin
Signal
PAD
Name
Usage
1
C109/DCD
N14
Data Carrier Detect
Output from the ME910G1 that indicates
the carrier presence
2
C104/RXD
M15
Transmit line *see Note
Output transmit line of ME910G1 UART
3
C103/TXD
N15
Receive line *see Note
Input receive of the ME910G1 UART
4
C108/DTR
M14
Data Terminal Ready
Input to the ME910G1 that controls the
DTE READY condition
6
C107/DSR
P14
Data Set Ready
Output from the ME910G1 that indicates
the module is ready
7
C105/RTS
L14
Request to Send
Input to the ME910G1 that controls the
Hardware flow control
8
C106/CTS
P15
Clear to Send
Output from the ME910G1 that controls
the Hardware flow control
9
C125/RING
R14
Ring Indicator
Output from the ME910G1 that indicates
the incoming call condition
Table 22: Available Signals