Telit Communications S.p.A. GC864Q2 ユーザーズマニュアル
GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 35 of 64
9.
Serial Ports
The serial port on the Telit GC864-QUAD V2 / GC864-DUAL V2 is the core of the
interface between the module and OEM hardware.
interface between the module and OEM hardware.
2 serial ports are available on the module:
• MODEM SERIAL PORT
• MODEM SERIAL PORT 2 (TRACE for debug)
• MODEM SERIAL PORT 2 (TRACE for debug)
9.1.
MODEM SERIAL PORT
Several configurations can be designed for the serial port on the OEM hardware, but
the most common are:
the most common are:
• RS232 PC com port
• microcontroller UART @ 2.8V – 3V (Universal Asynchronous Receive
• microcontroller UART @ 2.8V – 3V (Universal Asynchronous Receive
Transmit)
• microcontroller UART@ 5V or other voltages different from 2.8V
Depending from the type of serial port on the OEM hardware a level translator circuit
may be needed to make the system work. The only configuration that does not need a
level translation is the 2.8V UART.
may be needed to make the system work. The only configuration that does not need a
level translation is the 2.8V UART.
The serial port on the GC864-QUAD V2 / GC864-DUAL V2 is a +2.8V UART with all the
7 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is
reversed) and levels. The levels for the GC864-QUAD V2 / GC864-DUAL V2 UART are
the CMOS levels:
7 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is
reversed) and levels. The levels for the GC864-QUAD V2 / GC864-DUAL V2 UART are
the CMOS levels:
Absolute Maximum Ratings –Not Functional
Parameter
Min
Max
Input level on any
digital pad when on
digital pad when on
-0.3V
+3.1V
Input voltage on
analog pads when on
analog pads when on
-0.3V
+3.0 V