Wika CTH6300 User Manual download pdf (Page 33)

33WIKA operating instructions, models CTH6300 and CTH6500

2079988.04 07/2014 GB/D

6. Commissioning, operation / 7. Interface protocol RS-232

6.8 Special functions

6.8.1 Ohm/Microvolt/Volt/Hertz display

To display the indicated values in the corresponding basic unit, during switching on

simultaneously press FAST/▼ and ON/OFF button and keep them pressed for approx.

3 seconds until the following basic unit is displayed:

o = Ohm (Pt100)

H = Hertz (ow m/s)

u Microvolt (thermocouples)

U Volt (humidity)

6.8.2 Zero point adjustment (zero)

Keep the Clear key pressed (for approx. 3 seconds) to set the displayed value to 0.

Before pressing the key make sure that the actual value is also 0 (no ows/pressure

available at the probe).

6.8.3 Deactivation of channel 2 (Toggle)

Keep the Hold key pressed (for approx. 3 seconds) to deactivate or activate the 2nd

measuring channel.

7. Interface protocol RS-232

During data transfer make sure that the voltage levels for the signals RTS = +12 V and

DTR = -12 V are provided by the PC. This must be implemented by means of software

interface initialisation.

Parameters

Baud rate 2,400 baud

Data bits 8

Stop bits 2

Parity None

To transfer the measured values, the following requests must be sent to the measuring

instrument. The following table illustrates which values can be requested via the

interface.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 79 80

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Wika CTH6300 User Manual Page 33