WA_DEV_FEX20_UGD_002
Rev 002
April 26, 2010
39
Fastrack Xtend User Guide
Interfaces
Table 12: Serial Connector Pin Description
Pin #
Signal
I/O
I/O Type
Reset State
Description
1
CT109/DCD
O
+/- 5.5V
Undefined
Data Carrier Detect
2
CT103/TXD
I
+/- 5.5V
Z
Transmit Serial Data
3
BOOT
I
1V8
BOOT. This signal must not be
connected. Its use is strictly reserved
for Sierra Wireless or competent
retailers.
4
CMIC2P
I
Analog
Microphone positive input
5
CMIC2N
I
Analog
Microphone negative input
6
CT104/RXD
O
+/- 5.5V
1
Receive Serial Data
7
CT107/DSR
O
+/- 5.5V
Z
Data Set Ready
8
CT108-2/DTR
I
+/- 5.5V
Z
Data Terminal Ready
9
GND
GND
Ground
10
CSPK2P
O
Analog
Speaker positive input
11
CT106/CTS
O
+/- 5.5V
Z
Clear To Send
12
CT105/RTS
I
+/- 5.5V
Z
Request To Send
13
CT125/RI
O
+/- 5.5V
Undefined
Ring Indicator
14
RESET
I/O
1V8
Fastrack Xtend Reset
15
CSPK2N
O
Analog
Speaker negative input
5.1.2.1.
RS232 Serial Link Connection
Also known as the main serial link, the RS232 interface performs the voltage level adaptation
(V24/CMOS
⇔
V24/V28) between the internal Fastrack Xtend (DCE) and external applications (DTE).
The signals available on the RS232 serial link are as follows:
TX data (CT103/TXD)
RX data (CT104/RXD)
Request To Send (CT105/RTS)
Clear To Send (CT106/CTS)
Data Terminal Ready (CT108-2/DTR)
Data Set Ready (CT107/DSR)
Data Carrier Detect (CT109/DCD)
Ring Indicator (CT125/RI)