Matrox Electronic Systems 4SIGHT-M User Manual
Page 122
122 Appendix B: Technical reference
Top serial port connector (RS-232 standard only):
Bottom serial port connector:
Pin
Signal
I/O
Description of RS-232 standard
1
CD
I
Carrier detect.
2
RXD
I
Receive data.
3
TXD
O
Transmit data.
4
DTR
O
Data terminal ready.
5
GND
-
Ground.
6
DSR
I
Data set ready.
7
RTS
O
Request to send.
8
CTS
I
Clear to send.
9
RI
I
Ring indicator.
Pin
Signal
I/O
Description
RS-232 standard
RS-422/RS-485 standard with
resistor termination not activated
1
NC
I
Not connected.
Not connected.
2
RXD
I
Receive data.
RXD -.*
3
TXD
O
Transmit data.
TX -.
4
NC
O
Not connected.
Not connected.
5
GND
-
Ground.
Ground.
6
NC
I
Not connected.
Not connected.
7
RTS
O
Request to send.
TX +.
8
CTS
I
Clear to send.
RXD +.*
9
NC
I
Not connected.
Not connected.
* When resistor termination is activated, a resistor is connected between the receiver signals RXD- (pin 2)
and RXD+ (pin 8) at 120 ohms.
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