Digitrax SE74 Manual - Halaman 6

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5.0 External hardware Input lines:

The SE74 has eight external hardware control lines on the "SWITCH/SENSOR

IN" 10-pin PCB header using a plug-in 10-pin ribbon cable. The 6" Factory

ribbon cable pin 1 edge should be on the right side when plugged in. With Gray

cable the red stripe is pin 1 edge, and for 10-color cable pin 1 is BROWN, with

wire colors shown in Table 2.

If you use these external lines, connect the wires from the pins of Table 2 to your

custom wiring by e.g. screw terminal blocks. If using a Gray non-color ribbon

cable, make sure pin 1 and counted pin numbers match Table 2 usage.

Alternately, plug in a DSXC4

board with its ribbon cable, which

will support up to 4 DSXCP1 fascia

SW controls with switch state

indicating LEDs.

A +5V Reference voltage is

provided on pin 10/ribbon cable

BLACK wire for setting an ON/ac-

tive level, and a 0V/OFF reference

level on pin 9 or the WHITE wire.

DO not draw more than 100mA

from the BLACK wire. The SW/

SENS wires on pins 1/BROWN

through 8/GRAY are rated for up

to +16V maximum input voltage,

but best practice is 0V to 5V opera-

tion.

The SW1,SW2,SW3,and SW4 pins will toggle the state of the same number

output when briefly connected to the +5V ON voltage on the BLACK wire or

pin10. If the SE74 is connected to LocoNet this will occur as a SW# message

to make the change and notify the system it has occurred. Wire to momen-

tary press-on buttons for SW control.

The pins SENS1,SENS2, SENS3 and SENS4 will send a LocoNet Block

Occupancy or DS message at the SW# of the output. This will be BLOCK

OCCUPIED when the line is above +4V and a BLOCK UNOCCUPIED when

between 0V/WHITE and +2V.

For example; if the SENS2/YELLOW line of the input ribbon cable is con-

nected to the BLACK +5V Reference wire, the DS number reported will be

SW# used for Output 2R/2G. If SW10 is the SE74 BASE address of Output1,

then Output2 is SW11 and the DS message will be Block 11 OCCUPIED.

A disconnected SENS line will report as UNOCCUPIED.

The BD4N does not plug directly into a 10 pin header, and will not operate.

Connect the 5 wires used by the BD4N by name via a terminal strip. More

conveniently, you may connect the BD4N through a plugged in DSXC4 board

with ribbon cables for true plug and play connectivity. This will also allow

DSXCP1 SW control and state display.

These ribbon cable wires should not connect to any other voltage levels or

loads other than those defined here.

Table 2: SE74 Input lines

Pin# Wire Color

BROWN

RED

ORANGE

YELLOW

GREEN

BLUE

VIOLET

GRAY

WHITE

BLACK

— 6 —

Function

SW1 Toggle, +momentary

SENS1 occupancy level

SW2 Toggle, +momentary

SENS2 occupancy level

SW3 Toggle, +momentary

SENS3 occupancy level

SW4 Toggle, +momentary

SENS4 occupancy level

0V reference

+5V reference