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11.1 MODEM SERIAL PORT 1 (USIF0)
The serial port 1 on the UE910 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.
Output from the UE910 that indicates the carrier presence
Output transmit line of UE910 UART
Input receive of the UE910 UART
Input to the UE910 that controls the DTE READY condition
Output from the UE910 that indicates the module is ready
Output from the UE910 that controls the Hardware flow
control
Input to the UE910 that controls the Hardware flow control
Output from the UE910 that indicates the incoming call
condition
The following table shows the typical input value of internal pull-up resistors for RTS DTR
and TXD input lines and in all module states:
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