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2
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The RS232 Port
The designations below follow the RS232 standard’s DTE terminology.
Connections
Pin no
Signal
Function
Direction
Port 2
21
TxD2
Transmit data
Out
22
RxD2
Receive data
In
23
RTS2
Request to send
Out
24
CTS2
Clear to send
In
25
GND2 Signal Ground
26
SEL2
Select RS232 interface. The RS232
interface is selected via the hardware if
you connect the signal SEL2 to GND2.
Port 3
27
TxD3
Transmit Data
Out
28
RxD3
Receive Data
In
29
RTS3
Request To Send
Out
30
CTS3
Clear To Send
In
31
GND3 Signal Ground
32
SEL3
Select RS232 interface. The RS232 interface
is selected via the hardware if you connect
the signal SEL3 to GND3.
33
DTR3 Data Terminal Ready
Out
34
DSR3
Data Set Ready
In
35
DCD3 Data Carrier Detect
In
36
RI3
Ring Indication
In
