Instructions Circuit Diagram

- 64 -
11.2. USB-Infrared-Tranceiver
This operation is only for the USB IR-Transceiver.
WARNING! The USB IR-Transceiver does not have a housing and therefore it is very
sensitive for electrostatic discharge. Before you use it, discharge your body by touch-
ing a metal computer housing or other earth point. An other option is to build the USB
IR-Transceiver in a transparant housing for further protection.
11.2.1 Windows
The following operational check is limited to the USB Infrared-Tranceiver.
First of all the IR-Transceiver must be checked, as it will be needed for the next step:
the selftest of the system. For this test connect the IR-Transceiver to a free USB port of
your PC by the USB extension cable.
Now a message will apear “NEW HARWARE WAS FOUND”;
AREXX ASURO/YETI USB-IR-TRANSCEIVER
Now you can install the USB driver from the YETI CD. When the driver is not detected
automatically,youcanselectitmanuallyfromCD\windows\USBDriver(Administrator
rights are necessary for this operation). When the driver is installed you can approach
the USB Transceiver like a normal serial port. After starting the Hyperterminal program,
youwillbeaskedtodeneanamefortheconnection.YoumaychooseYETIUSBor
any other symbol. In the next window you choose “connect by” and the COM-interface
by which the transceiver has been connected in the previous step.
Then press “OK” and choose the following settings:
• Bits pro Second: 2400
• Databits: 8
• Parity: none
• Stopbits: 1
• Flowcontrol: none
Press“OK”againforconrmation
Hold the IR-Transceiver at the distance of 10 cm over a white sheet of paper. The
component side must be directed towards the paper sheet. Press a few keys at your
computer terminal. The terminal program normally should display the key-symbols.
The IR-Transceiver transmits the key-symbols by IR-Diode (D5), the transmitted signal
reectsatthepapersurfaceandissendbacktoreceiver-IC(IC2),fromwhichitis
being returned to the computer.
If you do not have any success in this procedure, we do have a problem with the
circuit, which should be solved. (see Appendix H or www.arexx.com for help).
Just to be sure you should remove the IR-Transceiver after this test and hit a few keys.
This time the display is expected to show no symbols any more.