Rockwell Automation 1770-SC User Manual

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(Cat. No. 1770-SC)

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This publication describes the Data Highway Station Connector and the installation
procedures for connecting the station connector to a Data Highway or Data Highway
Plus trunkline cable.

The station connector simplifies Data Highway connections made between the
trunkline and individual droplines, and protects the connections from the industrial
environment. One station connector is required for each dropline. The Station

connector replaces the 1770-XG Data Highway Cable Connector Kit.

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Each station connector includes the following:

• Junction box with removable cover, and terminal block wired with the following:

- 0.05 mfd 500V DC capacitor (terminals 4 and 5)

- Jumper (terminals 7 and 9)

- Ground wire (terminal 10) and earth ground wire with lug

• Packet containing:

-D-shell cable connector hood

- 15-pin female connector

- Packet of assembly hardware for the cable connector

- Terminator resistor (150ohm, 1/4 watt)

- Shrink tubing

- Cable plug

• A copy of this publication

Be sure each station connector you receive has these parts.

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Supersedes Publication 1770-2.20C — February, 1990

To make reliable connections, you should observe the following wiring
recommendations:

• Use Twinaxial Cable (cat. no. 1770-CD, Belden 9463 or equivalent) for the trunkline
and droplines.

• Be sure to connect the ground wire from the station connector to the earth ground.

• Route the twinaxial cable away from sources of electrical interference.

• Make trunkline connections to the upper side of the station connector; dropline
and earth ground connections to the lower side.

By observing these recommendations and those in the Data Highway Cable Assembly
and Installation Manual (publication 1770-6.2.1), you will reduce electrical noise
interference which can be induced into the trunkline and droplines.

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Use the following procedures to properly install each station connector. Read the
entire section before performing the procedures.

11..

Cut the dropline cable to your required length.

22

. Prepare the dropline cable for assembly. First carefully remove about one inch of

insulation, foil, braided shield, and filler cord from one end of the cable, freeing
the shield drain wire, clear, and blue insulated wires. Strip about 1/8 inch of
insulation from the ends of the insulated wires.

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(continued)

33..

Insert the prepared cable end through the circular hole in the hood of the D-shell
connector. Insert about 1/2 inch of shrink tubing over the ends of the three
conductors.

44..

Solder the blue, clear, and drain wires into their corresponding connector pins in
the back of the 15 pin female connector. Connect the blue wire to pin 6, drain wire
to pin 7, and clear wire to pin 8.

55..

Slide the shrink tubing forward over the soldered connections and shrink the
tubing with a heat gun.

66..

Assemble the 15-pin connector to the D-shell hood.

77..

At the other end of the dropline cable, carefully remove about three inches of
insulation, foil, braided shield, and filler cord, freeing the drain wire, clear and blue
insulated wires. Strip about 1/4 inch of insulation from the ends of the insulated
wires.

11..

Remove the cover and the terminal blocks from the enclosure and mount the
enclosure at the point where you want to add the dropline.

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Removing the terminal block allows you to make connections to the

screw-clamp terminals more easily.

22..

Cut the trunkline cable. Feed the incoming and outgoing trunkline cable through

their respective cable clamps at the top of the enclosure.

33..

Carefully remove about three inches of cable insulation, foil, braided shield, and
filler cord, freeing the drain wire, clear and blue insulated wires. Strip about 1/4
inch of insulation from the ends of the insulated wires.

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