User Manual

RH401 V1.4 09/04
7
RS-232 PC Communications Interface
RS-232 data format
Baud rate 9600
Parity none
Data bits 8
Stop bits 1
Flow control none
RS-232 Connection
Connect the optional interface cable from the meter to the communications port of the PC.
Using Windows® Terminal or HyperTerminal program for PC Communication
The Terminal or the HyperTerminal program is included in all Windows® operating systems.
Typically it is located using the following path:
START Menu > Programs > Accessories > Communications > Terminal or HyperTerminal
When in the Terminal or HyperTerminal program, configure as follows:
1. In the Connection Description window, enter a name, select an icon and click OK.
2. In the Connect To window, select COM1 or COM2 (depending on which port is being
used) and click OK.
3. In the Port Settings window, select the following data format: Baud rate 9600, no
parity, 8 data bits, 1 stop bit, and no flow control. Click OK to enter the main
HyperTerminal window.
4. In the File Menu, select Properties > Settings > ASCII SETUP, select “echo typed
characters” and “Send line ends with line feeds”. Click OK twice to return to the main
HyperTerminal window.
Format
Txxx.xC:Txx.xC:Hxx.x%:Txx.xC:Txx.xCLRC
CRLF
Where: The 1
st
value is IR Temperature, the 2
nd
value is Air Temperature, the 3
rd
value is
Humidity, the 4
th
value is Wet Bulb, and the 5
th
value is Dew Point.
Format for error value: E01 no value; E02 Overflow; E03 Underflow
Unit for error code is n
For example: if IR is disabled: TE01n
:T23.5C:H45.3%:T14.9C:T12.3CLRCCRLF
Maintenance
Cleaning and storage
1. The meter should be cleaned with a damp cloth and mild detergent when necessary.
Do not use solvents or abrasives.
2. Store the meter in an area with moderate temperature and humidity (refer to the
operating and storage range in the specifications chart earlier in this manual).
Battery Replacement
When the battery power falls low, the symbol will appear on the lower left of the LCD.
Replace the four (4) 1.5 ‘AAA’ batteries by removing the rear battery compartment cover
and accessing the battery compartment. Observe polarity when placing the batteries in the
compartment. Ensure that the compartment cover is securely fastened when finished.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com