Omega M3185/1098 Communication Protocol for RH31-RS232C, Storage of temperature-humiditysensor

4. Sample program

Prepare a data file in advance.

(1)In case of N88BASIC (A hard disc is used)

60 “232-C CIRCUIT”

110 ’DATA STORAGE

(2)In case of N88BASIC (a floppy disc is used)

80 “232-C Circuit”

100 FOR A = 0 TO 50000!

‘’SELECT THE FINAL VALUE TO CONFORM TO PC. 200 DATA STORAGE

220 IF 1=0 THEN PRINT ‘’COMMUNICATION IS IMPOSSIBLE”: END

Communication Protocol for RH31-RS232C

Start-Stop System
3 line system	: Talk only
Transmission Speed	: 1200 bps
Start bit	: 1 bit
Data Length	: 8 bits
Stop bit	: 1 bit
Character code	: ASCII code
Data transmission
Procedure	: Non-procedure

RH31-RS232C does not have any communication formats because this output measuring data at a stroke.

5. Maintenance

For cleaning it, wipe it off with a dry soft cloth without fail.

Never use benzene, thinner, or the like, otherwise a color change, deformation, deterioration of sensor, or other troubles may occur.

Storage of temperature-humidity sensor

For storing the sensor for a long time, seal it into a clean vinyl bag together with a desiccant like silica gel, and store it at a cool dark palce.

Filter exchange

The general type temperature-humidity sensor (RH31-1) filter can be replaced if it has become dirty. Remove the cap from the sensor tip by turning it counter- clockwise, and draw out the filter carefully to as not to damage the sensor.

Insert new filter with due care so as not to damage the sensor, and screw in the cap.

Measurement in a very wet atmosphere and moistening

In a very wet atmosphere of higher than 90%RH, dew may be formed due to a slight drop of the ambient temperature.

Even if dew is formed on the humidity sensor, no characteristic change occurs. However, it may cause an abnormal measured value. If dew has been formed on the sensor, dry it at 60 to 70˚ C for about one hour in a thermostatic oven or the like. Don’t dry it up abruptly. It takes longer than 12 hours to dry up the sensor at room temperature.

9

SECTION 4 OPERATING INSTRUCTIONS 4.1 Display Codes

(1) Connection joint:

Connect the exclusive temperature-humidity sensor to top of unit.

(2) AM/PM indication Note):

Indicated when the present time or preset data collection time is set.

(3) Battery shortage indication:

The battery shortage mark lights when the battery life comes to an end.

(4) [ON-OFF] key:

Turns on and off the power supply.

The power auto-off function is reset by [CLEAR] key + [ON-OFF] key.

(5) [HOLD] key:

Press this key when holding a measured value.

(6) [READ] key Note):

Press this key when transmitting data to a personal computer.

(7) [WRITE] key Note):

Press this key when setting the preset time or preset data collection time or when transmitting date to a personal computer.

(8) Measured temperature value and unit:

Indicates the measured temperature value and unit (˚ C or ˚ F).

(9) Measured humidity value and unit:

Indicates the measured humidity value and unit (%RH (relative humidity) ˚C (˚ F) (dew point), ˚ C (˚ F) flickering (wet-bulb temperature).

(10) [CLEAR] key:

Press this key when resetting the indication setting (hold, humidity unit selection).

(11) Unit indication mark:

Indicates the displayed humidity measuring unit.

%RH: relative humidity ˚C (˚F) (DP)lighting: Dew point ˚C (˚ F)(WB) flickering: Wet-bulb temperature.

(12) [SEL] key:

Press this key when changing the measuring unit of humidity.

OPERATION METHOD

Preparation for measurement

1. Assembly of battery

The battery is assembled at the delivery time from the factor and it is employable as it is. However, the battery life is not guaranteed due to the use for test. If the battery shortage mark is indicated, replace the battery.

For the method of replacing the battery, refer to [Maintenance].

2. Sensor connection

Connect the sensor securely to the circular connector at the upper part of the indicator, while taking care of the sensor correction direction.

6