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4. DB15 HD Connector: I/O expansion port
4.1 Connector pinout
The STD and DB15 models have a DB15 HD female connector used as I/O expansion port. The pinout of
this port and functionalities of each signal are shown in figure below:
5
10
6
15
PIN
SIGNAL
1
NC
2
RD 1
3
TD 1
4
IN 1
5
OUT 3
6
NC
7
RTS 1
8
CTS 1
9
INS
10
VEXT
11
IN 2
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1
11
DIRECTION
DESCRIPTION
Not connected
Output
RS232_1 signal: Received data
Input
RS232_1 signal: Transmitted data
Input
Opto-isolated input 1 (active low)
Output
Opto-isolated output 3 (open collector)
Not connected
Input
RS232_1 signal: Request to send
Output
RS232_1 signal: Clear to send
Input
Counter input
Output
Output voltage reference (4V)
Input
Opto-isolated input 2 (active low)
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