Serial port 1 on the HE910 V2 is a +1.8V UART with all 7 RS232 signals.
It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels.
Pin
Signal
I/O
Function
Type
N14
DCD - dcd_uart
O
Data Carrier Detect
1.8V
M15
RXD - Tx_uart
O
Transmit line *see Note
1.8V
N15
TXD - Rx_uart
I
Receive line *see Note
1.8V
M14
DTR - dtr_uart
I
Data Terminal Ready
1.8V
P14
DSR - dsr_uart
O
Data Set Ready
1.8V
L14
RTS - rts_uart
I
Request to Send
1.8V
P15
CTS - cts_uart
O
Clear to Send
1.8V
R14
RI - ri_uart
O
Ring Indicator
1.8V
NOTE:
For minimum implementation, only the TXD and RXD lines must be connected, the other
lines can be left open provided a software flow control is implemented.
NOTE:
In order to avoid a back powering effect it is recommended to avoid having any HIGH logic
level signal applied to the digital pins of the HE910 V2 when the module is powered off or
during an ON/OFF transition.
NOTE:
According to V.24, RX/TX signal names are referred to the application side. Therefore, on the
HE910 V2 side these signals are in the opposite direction: TXD on the application side will
be connected to the receive line (here named TXD/ rx_uart) of the HE910 V2 serial port and
vice versa for RX.
NOTE:
High-speed UART supports up to 4Mbps. Please refer to the AT command User Guide in
detail.
Содержание HE910-EU V2
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Страница 5: ...Contents 4 2 2 Hardware Shutdown ...
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Страница 49: ...The RS232 serial port lines are usually connected to a DB9 connector with the following layout ...
Страница 61: ...The recommendation for the PCB pads dimensions are described in the following image dimensions in mm ...
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Страница 71: ... Telit_SIM_Integration_Design_Guide_Application_Note ...