Metrohm 781 pH/Ion Meter: Operation via RS-232 Manual de usuario descargar pdf (Pagina 29)

4 Troubleshooting

780/781 pH/Ion Meter - Operation via RS232 27

4 Troubleshooting

Problem Questions for remedical action

No characters can be

received on a

connected printer.

• Are the instruments switched on and cables plugged in

correctly?

• Is the printer set to ”on-line”?

• Are baud rate, data bit and parity the same on both instruments?

• Is the handshake set properly?

If everything seems to be ok, try to print a report with the key

sequence <PRINT><SMPL DATA><ENTER>. If this report is

printed out correctly, check if reports are defined in key <DEF>.

No data transmission

and the display of the

pH/Ion Meter shows

an error message.

• error 42: Transmission error. Is the printer set to "on-line"? Is the

connection cable properly wired?

• error 43: Data output of the pH/Ion Meter disabled for longer

than 6 s by XOFF.

• error 36-39: Receive error. Are the RS settings the same on both

devices?

The received

characters are

garbled.

• Are the RS settings the same on both devices?

• Has the correct printer been selected?

• Data transfer has been interrupted on the hardware side during

the printout of a curve. Re-establish connections and switch

printer off/on.

Wrong line spacing. The printer does not emulate completely the preset mode. Usually

these problems arise with the IBM mode. Set the printer to a

different mode (e.g. Epson).

Printout of curve is not

ok. Other reports are

printed ok.

Handshake is necessary for the printout of curves.

• Is your cable correctly wired? (The DTR of the printer has to be

connected to the CTS of the pH/Ion Meter.)

• Set "HWs" for the handshake of the pH/Ion Meter. Configure the

printer such that its DTR is set (possibly with DIP switches).

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Metrohm 781 pH/Ion Meter: Operation via RS-232 Manual de usuario Pagina 29

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