LE910C1 Hardware User Guide
1VV0301298 Rev. 1.08 - 2017-11-14
Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved
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8.4. Serial Ports
The serial port is typically a secondary interface between the LE910C1 module and OEM hardware.
Two serial ports are available on the module:
• MODEM SERIAL PORT 1(Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware. The most common
are:
• RS232 PC com port
• Microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• Microcontroller UART @ 3.3V/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 make the system operate. The only configuration that does not need level translation is the 1.8V
UART.
The levels for LE910C1 UART are the CMOS levels as described in Section 4.3, Logic Level
Specifications.
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