Metrohm 781 pH/Ion Meter: Operation via RS-232 Uživatelský manuál stáhnout pdf (Strana 23)

3 RS232 interface properties

780/781 pH/Ion Meter - Operation via RS232 21

3 RS232 interface properties

3.1 Data transfer protocol

The pH/Ion Meter is configured as DTE (Data Terminal Equipment).

The RS232 interface has the following technical specifications:

• Data interface according to the RS232C standard, adjustable

transfer parameters, see page 16.

• Max. line length: 80 characters (incl. CR LF)

• Control characters: C

(ASCII DEC 13)

(ASCII DEC 10)

XON (ASCII DEC 17)

XOFF (ASCII DEC 19)

• Cable length: max. approx. 15 m

Start 7 or 8 Data Bit Parity Bit 1 or 2 Stop Bit

Only a shielded data cable (for example, Metrohm 6.2125.110 DB-

9/DB-25 or 6.2134.100 DB-9/DB-9) may be used to couple the pH/Ion

Meter with foreign devices. The cable shield must be properly grounded

on both instruments (pay attention to current loops; always ground in a

star-head formation). Only connectors with sufficient shielding may be

used

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Metrohm 781 pH/Ion Meter: Operation via RS-232 Uživatelský manuál Strana 23