RH350/355 V1.7 11/04
6
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:Hxx.x%:Txxx.xC:Txxx.xC:Txxxx.xC:Txxxx.xCLRCCRLF or
Txxx.xF:Hxx.x%:Txxx.xF:Txxx.xF:Txxxx.xF:Txxxx.xFLRCCRLF
Where: The 1
st
value is Air Temperature, the 2
nd
value is Humidity, the 3
rd
value is Dew
Point, the 4
th
value is Wet Bulb, the 5
th
value is T1, the 6
th
value is T2.
Format for error value: Exxn xx is error code, the unit is n
For example: if T1 is disconnected, then transmit:
Txxx.xC:Hxx.x%:Txxx.xC:Txxx.xC:TE04n:Txxxx.xCLRCCRLF or
Txxx.xF:Hxx.x%:Txxx.xF:Txxx.xF:TE04n:Txxxx.xFLRCCRLF
Error Codes
An error message will appear on the display if the meter fails an internal diagnostic test.
Note
: Error messages E4 and E7 will not display on the LCD. They will be transmitted to the
PC via the RS-232 cable and viewed in HyperTerminal.
1.
E2
: Air temperature is over the range.
2.
E3
: Air temperature is below the range.
3.
E4
: T1 Thermocouple not plugged in
4.
E5
: T1 temperature is over the range.
5.
E6
: T1 temperature is below the range.
6.
E7
: T2 thermocouple not plugged in
7.
E8
: T2 temperature is over the range.
8.
E9
: T2 temperature is below the range.
9.
E11
: Temperature of isothermal block is over the range.
10.
E12
: Temperature of isothermal block is below the range.
11.
E21~E23
: Circuit error. Repair/replacement necessary
12.
E25
: Circuit error. If problem persists, repair/replacement necessary
13.
E26
: Circuit error. If problem persists, repair/replacement necessary
