Telit GE863-QUAD / GE863-PY
Hardware User guide
1vv0300697, Rev. ISSUE#0, - 21/11/05
Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved
page 21 of 69
The signals of the GE863-QUAD serial port are:
RS232
Pin
Number
Signal
GE863-
QUAD Pad
Number
Name
Usage
1
DCD -
dcd_uart
42
Data Carrier Detect
Output from the GE863-QUAD that
indicates the carrier presence
2
RXD -
tx_uart
38
Transmit line *see Note
Output transmit line of GE863-QUAD
UART
3
TXD -
rx_uart
37
Receive line *see Note Input receive of the GE863-QUAD UART
4
DTR -
dtr_uart
39
Data Terminal Ready
Input to the GE863-QUAD that controls
the DTE READY condition
5
GND
8-17-28-36-
45-48-50-56
Ground
ground
6
DSR -
dsr_uart
43
Data Set Ready
Output from the GE863-QUAD that
indicates the module is ready
7
RTS -
rts_uart
40
Request to Send
Input to the GE863-QUAD that controls
the Hardware flow control
8
CTS -
cts_uart
41
Clear to Send
Output from the GE863-QUAD that
controls the Hardware flow control
9
RI -
ri_uart
44
Ring Indicator
Output from the GE863-QUAD that
indicates the incoming call condition
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the
GE863-QUAD side these signal are on the opposite direction: TXD on the application side will be
connected to the receive line (here named TXD/ rx_uart ) of the GE863-QUAD serial port and
viceversa for RX.
TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other lines
can be left open provided a software flow control is implemented.
The signals in the UART connector on the EVK are:
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
GND
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