4112221
Rev 7.2
June 19, 2013
34
User Guide
Interfaces
5.1.2.
Serial Interface
A SUB-D 15-pin connector is available as a serial interface to directly communicate with the FX Series.
This serial interface is used for:
RS232 serial link connection
Audio lines connection (microphone and speaker)
BOOT signal connection (not used in FX100)
RESET signal connection
Figure 17. 15-Pin Serial Connector
Refer to the following table for the pin description of the 15-pin serial connector.
Table 13.
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
FX Series Reset
15
CSPK2N
O
Analog
Speaker negative input
*
Not used in FX100.
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