
INSYS GSM 4.3
Connections
8.4
Pin Assignment of the Serial Interface
Figure 7: 9-pin D-Sub jack at the device
Pin
Signal
Description
1 DCD
Data
Carrier
Detect
2 RXD
Receive
Data
3
TXD Transmit
Data
4
DTR
Data Terminal Ready
5 GND
Ground
6
DSR
Data set ready
7
RTS
Request to send
8
CTS
Clear To Send
9 RI
Ring
Indication
Table 10: Description of the pin allocation of the D-Sub jack
8.5
Audio Connection (not INSYS GSM 4.3 compact)
Pin
Signal
Description
1 Microphone
-
2 Speaker
-
3
S
4 Microphone
+
Table 11: Layout of the Western socket
29