Connecting The Rs232 Interface; Com 1 Interface Pin Connections - OHAUS PA64 Service Manual

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.
Figure 1-5. COM 1 Connector.
*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:
Pioneer™ Balances Service Manual
TABLE 1-9. COM 1 INTERFACE PIN CONNECTIONS
J1*
Zero/Tare*
J2*
Print*
1-9
CHAPTER 1 GETTING STARTED
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
Figure 1-6. Soldering points J1 and J2.
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