RS232 Communications, Measurement, Data Read

Measurement

Display appears by pressing the [ON-OFF] key after the unit has been ready for measurement.

The power supply turns off automatically about 3 minutes after the last key operation has been finished. For canceling the auto off function, press [ON-OFF] key together with the [CLEAR] key when the power supply is turned off. In this case, a confirmation chime sounds three times.

After several seconds, the sensor number is displayed as shown in (2).

(Note) The display number may change from 01 to 09 according to the kinds of sensor, etc. However, it does not affect any measurement at all.

After several seconds, a measured temperature value is indicated in the upper column, while a measured humidity value is indicated in the lower column as shown in (3).

The initial value of the humidity unit shows a relative humidity. It changes in the order of %RH (relative humidity) → ˚ C (˚ F) (dew point) → ˚ C (˚ F)flickering (wet-bulb temperature) → %RH → ...

(4)shows an example of the dew point indication, while (5) shows an example of the wet-bulb temperature indication. This display turns to %RH indication when pressing the [CLEAR] key.

For finishing the measurement, press [ON-OFF] key. The power off function is set automatically when turning on the power supply next.

KEY OPERATION METHOD WHEN THE UNIT IS

PROVIDED WITH A MEMORY FUNCTION

Data Collection

1. Present time setting

Display flickers when pressing [WRITE] key.

[Year] flickers when pressing [READ] key and it advances stepwise, each time [READ] key is pressed once.

When a desired [Year] has been displayed, press the [WRITE] key to define the year.

For [Month], [Day], [Hour], and [Minute], press [READ] key until they reach a desired value respectively and press [WRITE] key to define them.

By pressing [CLEAR] key, the setting returns to the last one.

2.Setting of the data collection start time Set the data collection start time.

After setting the present time, display flickers.

[Year] flickers when pressing [READ] key and it advances stepwise, each time [READ] key is pressed once.

When a desired [Year] has been displayed, press the [WRITE] key to define the year.

For [Month], [Day], [Hour], and [Minute], press [READ] key until they reach a desired value respectively and press [WRITE] key to define them.

By pressing [CLEAR] key, the setting returns to the last one. Set the reservation time ahead from the present time without fail.

3. Collection and stop

When the reservation time has been set, the confirmation chime sounds. After about 3 minutes, the display appears, and the data collection is started from the reservation time.

For stopping the data collection, press [ON-OFF] key to display the measured value, and then, press the [CLEAR] key.

When the data collection start time has already been set, data collection is executed at the preset time even if the power supply is turned off.

4. Memory

Data can be collected by [temperature, humidity] x 1500.

Data collection is stopped when the memory capacity is fully filled with data. The measuring interval is fixed to 10 minutes.

If data collection was interrupted halfway, past data are valid, but subsequent old data become invalid. (Preset 1000 data are valid, but the 500 data collected last become invalid.)

4.2 RS232 Communications

DATA READ

1. Connection to personal computer

Prepare an NEC PC98 series personal computer.

Connect RH31 to the personal computer by using the attached cable. Attached RS-232C cable

Personal computer

2. Setting of personal computer

Set RS-232C of the personal computer as follows.

Transfer speed: 1200 bps

Character length: 7 bits Parity: None

Stop bit: 2 bits X parameter: None

3. Data read and stop

Data are transmitted to the personal computer by pressing the [READ] key.

In this case, data are transmitted in the units of humidity selected by [SEL] key. Data read is stopped by pressing [CLEAR] key.

Read data (text format) are as shown below

Specify the delimiters of data by comma [,], and use the table calculation soft- ware (EXCEL, Lotus123, etc. for example). Measured values are described on the

cell numerically.
a. Collection interval	b. number
c. Temperature	d. Humidity

e. Measurement start year, month, day, and hour %RH: Relative humidity C(F): Dew point $C($F): Wet-bulb temperature

M3185/1098 specifications

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