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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
4.6.1.4 Sockets P12 and P14
On the System Interface board, the two 14-pin sockets
P12
and
P14
are used to connect to
the Talker board.
The table below shows the pinout of socket
P12
.
Pin 1
Not Connected
Pin 16
Not Connected
Pin 2
Not Connected
Pin 15
Not Connected
Pin 3
Not Connected
Pin 14
Not Connected
Pin 4
Not Connected
Pin 13
Not Connected
Pin 5
Not Connected
Pin 12
Not Connected
Pin 6
Active low reset signal from
processor-A. Used to reset the Talker
board.
Pin 11
Active low PTT signal to
processor-A from Talker board.
Pin 7
Receive serial data to processor-A.
Pin 10
Not Used
Pin 8
Transmit serial data from processor-A.
Pin 9
Negative 12-volts to Talker board.
The table below shows the pinout of socket
P14
.
Pin 1
+12 VDC supply to Talker board.
Pin 16
TX audio to radio.
Pin 2
+12 VDC supply to Talker board.
Pin 15
Audio to System Interface board for
amplification to drive speaker.
Pin 3
+12 VDC supply to Talker board.
Pin 14
Active low holdoff-out signal.
Pin 4
Not Connected
Pin 13
Not Used
Pin 5
Not Connected
Pin 12
Active low PTT signal from Talker to
radio.
Pin 6
Ground
Pin 11
Not Connected
Pin 7
Ground
Pin 10
Not Connected
Pin 8
Ground
Pin 9
Not Connected
4.6.1.5 Connectors P1-P4
On the System Interface board, the four 32-pin connectors P1, P2, P3, and P4 are used to
connect to the Processor board. These connectors are keyed so that the Processor board
cannot be plugged in backward. Totaling 128 pins that carry power supply voltages, address
lines, data lines, digital signals, and analog signals to and from the Processor board.
Be sure that the system is completely powered down before removing or installing the
Processor board.
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