Rs485; 20Ma Current Loop - Cardinal SB250 Series Installation Manual

SERIAL CABLE INSTALLATION, CONT.

RS485

1. Loosen the cable gland connector for
the serial cable. The gland
connector for the serial cable is
located on the bottom of the
enclosure. Refer to Figure No. 3 for
an illustration of the gland connector
layout.
2. Slip the serial cable through the
gland connector and into the
enclosure.
3. Remove 2" of the outer insulation
jacket from the cable then remove
1/2" of insulation from each of the
wires.
4. Referring to Figure No. 5 for the
location of the terminal block and for
the correct terminal connections,
connect each of the wires to the
terminal block.
5. To connect each wire to the terminal
block, first loosen each of the screw terminals then insert the wire under the terminal
washer. Tighten the screw to secure the wire in place.
6. Insure that the termination jumper J2 is set correctly. It must be ON for termination or
OFF for un-terminated operation.
7. Insure that the 2-wire or 4-wire selection jumpers J1 and J3 are set correctly. Both
jumpers must be ON for 2-wire operation or both must be OFF for 4-wire operation.
8. Install the Receive mode jumper J4, on the 485 pins.

20mA Current Loop

1. Loosen the cable gland connector for the serial cable.
The gland connector for the serial cable is located on
the bottom of the enclosure. Refer to Figure No. 3 for
an illustration of the gland connector layout.
2. Slip the serial cable through the gland connector and
into the enclosure.
3. Remove 2" of the outer insulation jacket from the
cable then remove 1/2" of insulation from each of the
wires.
4. Referring to Figure No. 5 for the location of the
terminal block and for the correct terminal
connections, connect each of the wires to the terminal
block.
5. To connect each wire to the terminal block, first loosen
each of the screw terminals then insert the wire under
the terminal washer. Tighten the screw to secure the
wire in place.
6. Install the Receive mode jumper J4, ON the CL pins.
8
Figure No. 9
3601-M481-O1 Rev C • SB250 Series
Figure No. 8