User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 62 of 89
The signals of the HE863 Family serial port are:
RS232
Pin
Number
Signal
HE863
Family
Ball
Name Usage
1
DCD -
dcd_uar
t
(TBD)
M3
Data Carrier
Detect
Output from the HE863 Family that
indicates the carrier presence
2
RXD -
Tx_uart
J4
Transmit line
*see Note
Output transmit line of HE863 Family
UART
3
TXD -
Rx_uart
J3
Receive line
*see Note
Input receive of the HE863 Family UART
4
DTR -
dtr_uar
t
(TBD)
L3
Data Terminal
Ready
Input to the HE863 Family that controls
the DTE READY condition
5 GND All GND Ground ground
6
DSR -
dsr_uar
t
(TBD)
L4
Data Set
Ready
Output from the HE863 Family that
indicates the module is ready
7
RTS -
rts_uar
t
K3
Request to
Send
Input to the HE863 Family that controls
the Hardware flow control
8
CTS -
cts_uar
t
K4 Clear to Send
Output from the HE863 Family that
controls the Hardware flow control
9
RI -
ri_uart
(TBD)
M4
Ring
Indicator
Output from the HE863 Family that
indicates the Incoming call condition
TIP:
For 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.
NOTE:
According to V.24, RX/TX signal names are referred to the
application side, therefore on the HE863 Family 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 HE863 Family serial port and vice versa for
RX.