6
2.4
RS-232 Interface
The serial interface of the
EZ864 PY
is intended for the communication between the GSM module and the host
application. This RS-232 interface is a data and control interface
for transmitting data, AT commands and providing multiplexed channels. EMC immunity
complies with the vehicular environment requirements according to EN 301 489-7.
The user interface of the
EZ864 PY
is accessible from a Data Terminal Equipment DTE connected to the RS232
interface and it is managed by AT commands according to the GSM 07.07 and 07.05 specification and the
supported commands are
listed in the AT Commands Reference
Guide.
Pin assignment RS-232 D-Type 9 female RS232
(D-Type 9 female)
Connector type on the terminal is:
• RS-232 through D-Type 9-pin female
• Baud rate from 300 to 115.200 bit/s
• Short circuit (to Ground) protection on all outputs.
• Input voltage range: -5V to +5V
Pin
no.
Signal name
I/O
Function of application
1
DCD
O
Data Carrier Detected
2
RXD
O
Receive Data
3
TXD
I
Transmit Data
4
DTR
I
Data Terminal Ready
5
GND
-
Ground
6
DSR
O
Data Set Ready
7
RTS
I
Request To Send
8
CTS
O
Clear To Send
9
RING
O
Ring Indication
