User's Manual

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 70
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