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76 Appendix B: Technical reference
Pin
Signal
7
RTS
8
CTS
9
RI
The top serial port connector (RS-232/RS-485 standard) has the following
pinout:
Pin
Hardware
signal name
1
NC
2
RXD
3
TXD
4
NC
5
GND
6
NC
7
RTS
8
CTS
9
NC
1. Earlier versions of Matrox 4Sight GPm do not include or allow activation of internal terminator resistors when in RS-485
mode. For details, see Appendix F: Listing of Matrox 4Sight GPm units. To set the RS-485 termination, see RS-485 termina-
tion connector subsection of the Pinout descriptions of internal connectors section, later in this appendix.
Audio input and audio output connectors
The audio input and audio output connectors are 3.5 mm TRS mini-jacks
designed to carry stereo audio. You can connect a stereo audio device to the audio
input and output connectors, using a 3.5 mm audio input/output 3.5 mm TRS
mini-jack plug. The audio interface is only designed for line input/output
operations. Since there is no output amplifier or input preamplifier, the interface
does not support speakers or microphones.
I/O
RS-232 standard
I
Not connected.
I
Receive data.
O
Transmit data.
O
Not connected.
-
Ground.
I
Not connected.
O
Request to send.
I
Clear to send.
I
Not connected.
Description
Request to send.
Clear to send.
Ring indicator.
Description
RS-485 standard with resistor
termination not activated
Not connected.
RXD -.
TX -.
Not connected.
Ground.
Not connected.
TX +.
RXD +.
Not connected.
1
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