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Data and Control Ports
Seanet SCU v5
0581-SOM-00002-02
Tritech International Ltd.
Page 25 of 35
• Signals on pins 4, 5, 6, 7, 8, 11, 12, 13, 14 and 15 are with respect to the ground
on pin 2.
• The +12V output on pin 9, and the +5V output on pin 10 is with respect to pin 3,
External Ground.
• The RS-232 signals on pins 5, 6, 12, 2 and 13 are present simultaneously on this
connector and the DE-9 connector
PORT A
.
RAT Interface
A single 9-Way D-Type Female connector for connection to a V2 RAT (with PS2
mouse and RS-485 data signals only)
RAT
SCU DE-9 female connector
Pin
Function
1
GROUND
2
+5v DC
3
RAT RS485 B
4
RAT RS485 A
5
‡
6
‡
7
PS/2 SCLK
8
PS/2 SDATA
9
+12v DC
‡ = connected for handshaking only.
• RAT RS-485 and PS2 data signals are not isolated, and are with respect to the
internal power supplies “+5V” and “GROUND”.
• An internal 150ohm termination resistor is fitted across the RS-485 input signals
(pins 3 and 4).