Ohaus CD-33 Indicator - Manual (Page 9)

9
CD Indicators
2.3 Connecting the Indicator to a
Scale Base
• Turn the Indicator over.
NOTE:Check the wiring instructions of your scale base.
• The Terminal Block located at the left side of the
access area is used to connect a scale base using
a 4-wire cable and ground. If a 6-wire cable is
supplied with the scale base, tie the +SENSE and
+EXC leads together and connect to the +EXC
connector. Tie the -SENSE and -EXC leads together
and connect it to the -EXC connector on the Indica-
tor.
• Connect the wires to the Terminal Block. Tighten all
screws securely.
• To provide a strain relief, dress the wire cable from
the scale base in the channel provided on the
bottom of the indicator.
• If the Indicator is not used in a legal for trade
application, install the sealing plate at the bottom of
the Indicator and secure with two screws as shown
on the illustration.
2.4 Connecting the RS232 Interface
CD-31/CD-33 Indicators are equipped with a standard
IBM
TM compatible, bi-directional RS232 interface for
communication with printers and computers. When the
Indicator is connected directly to a printer or Program-
mable Logic Controller (PLC), displayed data can be
recorded at any time by simply pressing the PRINT
button.
Connecting the Indicator to a computer or PLC enables
you to operate several functions of the Indicator from the
computer, as well as receive data such as displayed
weight, weighing mode, stability status, etc.
2.4.1 Hardware
A 9-pin “D” connector is located inside of the recessed
area at the bottom of the indicator. Pin connections are
shown in the adjacent illustration.
Connect an Ohaus RS232 cable to the Indicator. Refer to
paragraph 5.5 Accessories.
Remote Tare Option
External PRINT and/or TARE switches may be installed
as shown in the diagram to the right. Momentary contact
switches must be used.
1 N/C
2 Data In (RXD)
3 Data Out (TXD)
4 Data Terminal Ready (DTR)
5 Ground
6* Tare (External signal)
7 Request To Send (RTS)
8 Clear To Send (CTS)
9* Print (External signal)
RS-232 Connector Pin Layout.