IRgaskiT
Application Note 2 - Connecting to a wireless device.
Things to do
with your IRgaskiT No.2
With just a few readily
available components you can make your IRgaskiT a wireless
device to use with any Bluetooth enabled PC.
First you will need an IRgaskit with a
suitable sensor head you will also need an RS232 Bluetooth
adapter (we used the LM Technologies LM-058 see
http://www.lm-technologies.com/ci/index.php?/products/details/3
) some ribbon cable, a 9 way D type IDC socket and two
micromatch plugs one (4 way one 10 way). We used a 10 way ribbon
cable and a free plug (ours were from Farnell Part No. 149032,
149081 and 1555549).
In order to make the Serial adapter cable for the LM-058 you
will need to cut a 10 cm piece of ribbon cable and remove ~1cm
of conductor #10 from one end.
Attach the 9 way ‘D’ socket to the 9 way end of the ribbon cable
(wire#1 to pin #1). Attach the 10 way micromatch plug to the
ribbon cable (pin#1 to wire #1) ~5 cm from
‘D’ type socket. Separate wires 1 to 6 from wires 7 to 10
and fit the 4 way micromatch plug to wires 6 to 10 (wire #10 to
pin#1) near the end of the cable wires 1
to 6 are then removed
near the 10 way micromatch. Wires # 10, 9 and 7 are removed
between the 10 and 4 way micromatch plugs to leave only wire #8.
Wire 8 is connected to CN5 pin 2 on the interface board to
provide 5V to pin 9 (wire#8) on the ‘D’ type.
To power the LM-058
for other adapters the power may have to be provided inanother
way.
Figure 1
- Wiring Diagram for our USB Cable
Once you have checked
your cable the 10 way micromatch is plugged into CN3 and the 4
way micromatch is plugged into CN5 on the IRgaskiT interface
board.
Before it can be used
the LM-058 must be set up to use 57600 Bits per second, 8 Data
bits, No Parity, 1 Stop bit and Software Flow Control. This is
done by connecting the LM-058 to a PC and then using either the
supplied utility (MS Windows) or a serial terminal to send the
required commands to the LM-058.
Serial terminal emulators are available for most
Operating Systems (OS) there are often supplied with the OS or
are downloadable from the internet. e.g. Minicom or Gtkterm for
Linux and Quickterm for OS X.
Once the setup is
complete the LM-058 is set to DCE mode using the switch on the
side and connected to the 9 way ‘D’ type on the IRgaskiT
interface cable. When power is supplied to the IRgaskit the
LM-058 will be powered through the interface cable.
A Bluetooth
enabled PC and either serial terminal software (such as
HyperTerminal supplied with MS Windows up to XP but not with
Vista) or the IRgaskit (MS Windows) data logger
available from the Edinburgh Instruments web site may be used to
communicate with your IRgaskiT via Bluetooth without the need
for any cables between the IRgaskiT and the PC.
Figure 2 below shows our USB interface cable
connected to an IRgaskiT with a 10% CO2 head.
Figure 2 -
Completed USB enabled IRgaskiT |
