OHAUS Pioneer PA64, Service Manual

Page: 19 / 116

CHAPTER 1 GETTING STARTED
Pioneer
™ Balances Service Manual
1-9 Ohaus Corporation www.ohaus.com
1.6 Connecting the RS232 Interface
When the interface is connected to a computer, two-way communication between the computer
and balance is possible using the commands outlined in the RS232 Command Table 1-10.
RS232 Commands
All communication is accomplished using standard ASCII format. Only the characters shown in
the RS232 Command Table 1-10 are acknowledged by the balance. Invalid command
response "ES" error indicates the balance has not recognized the command. Commands sent
to the balance must be terminated with a carriage return (CR) or a carriage return-linefeed
(CRLF). Data output by the balance is always terminated with CRLF.
On the rear of the balance, the 9-pin female subminiature "D" connector COM 1, is provided for
interfacing to other devices. The pin connections are shown in the illustration below.
TABLE 1-9. COM 1 INTERFACE PIN CONNECTIONS
Figure 1-5. COM 1 Connector.
COM 1 Pin Connections
1
– Remote Tare
2
– TxD
3
– RxD
4
– Not used
5
– Ground
6
– Not used
7
– CTS
8
– RTS
9
– Remote Print
*
External PRINT and/or ZERO/TARE switches may be installed as shown in the diagram.
Use only momentary contact switches.
To enable External PRINT and/or ZERO/
TARE functions, join the solder points for Tare
(J1) and Print (J2), on the Main PCB:
1. Locate solder points J1 and J2 on the
Main PCB, adjacent to the RS232 input
jack.
2. Using a low wattage soldering iron,
apply a small amount of solder to:
– Join two points at J1 to enable Tare.
– Join two points at J2 to enable Print.
Join the points by filling the gap:
Figure 1-6. Soldering points J1 and J2.
Zero/Tare *
Print *
J1
*
J2 *