Rainbow Electronics GE863-PY - Manual (Page 38)

GE863 Hardware User Guide
1vv0300783 Rev.0 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 38 of 80
The signals of the GE863 serial port are:
RS232 Pin
Number
Signal
GE863 Pad
Number
Name Usage
1 DCD -
dcd_uart
42 Data Carrier Detect Output from the GE863 that indicates the carrier
presence
2 RXD -
tx_uart
38 Transmit line *see Note Output transmit line of GE863 UART
3 TXD -
rx_uart
37 Receive line *see Note Input receive of the GE863 UART
4 DTR -
dtr_uart
39 Data Terminal Ready Input to the GE863 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 that indicates the module is
ready
7 RTS -
rts_uart
40 Request to Send Input to the GE863 that controls the Hardware flow
control
8 CTS -
cts_uart
41 Clear to Send Output from the GE863 that controls the Hardware
flow control
9 RI -
ri_uart
44 Ring Indicator Output from the GE863 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 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 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.
TIP: In order to avoid noise or interferences on the RXD lines it is suggested to add a pull up
resistor (100Kohm to 2.8V)