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Reference Guide
Refer to the following table for the pin description of the 15-pin serial connector.
Table 8.
Serial Connector Pin Description
Pin #
Signal
1
CT109/DCD
2
CT103/TXD
3
Reserved
4
CMIC2P
5
CMIC2N
6
CT104/RXD
7
CT107/DSR
8
CT108-2/DTR
9
GND
10
CSPK2P
11
CT106/CTS
12
CT105/RTS
13
CT125/RI
14
RESET
15
CSPK2N
3.1.2.1.
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 modem (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)
I/O
I/O Type
O
+/- 5.5V
I
+/- 5.5V
I
Analog
I
Analog
O
+/- 5.5V
O
+/- 5.5V
I
+/- 5.5V
GND
O
Analog
O
+/- 5.5V
I
+/- 5.5V
O
+/- 5.5V
I/O
1V8
O
Analog
Rev 1.0
Reset State
Description
Undefined
Data Carrier Detect
Z
Transmit Serial Data
Do not connect
Microphone positive input
Microphone negative input
1
Receive Serial Data
Z
Data Set Ready
Z
Data Terminal Ready
Ground
Speaker positive input
Z
Clear To Send
Z
Request To Send
Undefined
Ring Indicator
Modem Reset
Speaker negative input
Interfaces
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