CHAPTER 1 GETTING STARTEDPioneer™ Balances Service Manual 1-9 Ohaus Corporation www.ohaus.com1.6 Connecting the RS232 InterfaceWhen the interface is connected to a computer, two-way communication between the computerand balance is possible using the commands outlined in the RS232 Command Table 1-10.RS232 CommandsAll communication is accomplished using standard ASCII format. Only the characters shown inthe RS232 Command Table 1-10 are acknowledged by the balance. Invalid commandresponse "ES" error indicates the balance has not recognized the command. Commands sentto 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 forinterfacing to other devices. The pin connections are shown in the illustration below.TABLE 1-9. COM 1 INTERFACE PIN CONNECTIONSFigure 1-5. COM 1 Connector.COM 1 Pin Connections1 – Remote Tare2 – TxD3 – RxD4 – Not used5 – Ground6 – Not used7 – CTS8 – RTS9 – 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 theMain PCB, adjacent to the RS232 inputjack.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*
