Jumper Positions; Interface Connections; Connecting Rs232 Interface Cable; Connecting External Input Device (Not Supplied - OHAUS CKW-55 Instruction Manual

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Remove the 3 screws securing the switch cover over Terminal Strip J2. Refer to the manufacture's wiring code of the load cell
cable and connect the wires to Terminal Strip J2 according to the proper signal name. See Figure A-2. Tighten all terminal
screws securely.
A.2 JUMPER POSITIONS
When connecting a 2 mv/v load cell: Jumper W1 is to be left in place shorting the two pins. See Figure A-3.
When connecting a 3 mv/v load cell: Jumper W1 must be removed or left in place with one pin uncovered.
When connecting a 4-wire load cell with no sense wires: Jumpers W2 and W3 must be left in place shorting the two pins.
When connecting a 6-wire load cell that includes sense wires, Jumpers W2 and W3 must be removed.
When connecting a load cell with an extra ground shield wire: The shield wire may be connected to the center position of J2.
After wiring is completed and jumpers are in place, replace the switch cover and securing screws on the main PC board.
Replace the indicator housing screws. Make sure the liquid-tight connector is properly tightened.
A.3 INTERFACE CONNECTIONS
CAUTION: ELECTRICAL SHOCK HAZARD. REMOVE ALL POWER CONNECTIONS TO
THE INDICATOR BEFORE SERVICING OR MAKING INTERNAL CONNECTIONS.
THE HOUSING SHOULD ONLY BE OPENED BY AUTHORIZED AND QUALIFIED PERSONNEL,
SUCH AS AN ELECTRICAL TECHNICIAN.
A.3.1 Connecting RS232 Interface Cable
The CKW-55 Indicator is equipped with a bidirectional RS232 interface for communication with external printers or
computers. All communication is accomplished using standard ASCII format. Only two signal wires and ground are
required, hardware handshaking signals are not used. To connect the RS232 cable, proceed as follows:
• Unfasten the side screws of the indicator housing and remove the front cover by pulling forward.
• Pass the communication cable through one of the I/O liquid-tight connectors at the bottom of the indicator housing.
• Match the wire signals to connector J4 on the main PC board and connect the cable accordingly. See Figure A-2.
• Connect the opposite end of the communication cable to the communication device.
• Reinstall the front cover and make sure the liquid-tight connector is tight.
• Refer to Section 3.6.5 to set up the proper communication parameters.
Note: When the optional RS485/422 Interface is installed, the RS232 Interface cannot be used.
A.3.2 Connecting External Input Device (Not supplied)
The CKW-55 Indicator has provisions to connect an external input device such as a foot switch (purchased separately) to
provide a selected function. The selected function can be set in the I/O menu, (see section 3.6.6 when the indicator is fully
functional). The external device must provide a normally open (N.O.) momentary switch contact.
To connect the interface cable, proceed as follows:
• Unfasten the side screws of the indicator housing and remove the front cover by pulling forward.
• Pass the remote cable through one of the I/O liquid-tight connectors at the bottom of the indicator housing.
• Connect the cable to connector J7 on the main PC board. See Figure A-2.
• Re-install the front cover and make sure the liquid-tight connector is tight.
APPENDIX A
Figure A-3. Open and Shorted Jumpers.
CKW-55 CHECKWEIGHER