9
Connecting to a USB port If your
computer has USB ports you can get
an optional RS-232 to USB adapter
from Ohmic. Ohmic recommends
using an RS-232 to USB adapter only
with Windows XP
©
and Windows
Vista
©
. Connect the AMM-15 using
the RS-232 adapter and RS-232 to
USB adapter. Turn on your computer.
When your computer recognizes the
device click OK and follow the instruc-
tions for installing the driver software.
Set up your communications program
as described below.
Communications Programs
The AMM-15 transmits data via its RS
-
232 output as soon as it is powered
up. In order to receive the data, a
communications (or terminal) program
must be running on your computer.
We recommend
Tera Term;
it is easy
to use, free, and available for down-
load from www.download.cnet.com.
When you reach that page, type “Tera
Term” in the Search box; you will then
be able to download the installation
program. Then:
1. Install the program and run it.
2. A
New Connection
window will
open. Click the “Serial” button,
then select the COM port you will
be using, and click OK.
3. Tera Term should now be ready to
receive data from the AMM-15.
Make sure they are connected via
the adapter cable, and power up
the AMM-15.
4. Text will be displayed indicating
the version of the embedded pro-
gram. The computer will then dis-
play four numbers, as indicated
below:
(Date) (Time) (Dew Point) (Temp.)
mm/dd/yy hh/mm/ss xx.x xxx.x
New readings will be displayed
every few seconds and are in a
comma delimited format that can
be copied and pasted into a
spreadsheet program, if desired.
If readings are not displayed,
turn the
AMM-15 off, and in Tera Term click
on
Setup
in the menu bar, then se-
lect
Serial Port
. This will open a win-
dow where you can check several
parameters:
•
Port:
Try another port until you
find the right one.
•
Baud rate:
Should be 9600.
•
Data:
8 bit
•
Parity:
None
•
Stop:
1 bit
•
Flow Control:
Off
Once you get a working display you
may want to save your settings. Re-
fer to Tera Term’s help file for infor-
mation on this and other functions.
Other communications programs can
also be used; some older versions of
Windows include one called Hyper-
Terminal. Refer to its help file for
information on using it and applying
the parameters above.
Summary of Contents for AMM-15
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