User Manual

www.id-innovations.com
11
ID-2/12/20 LA Series Datasheet X1
11.04.2013
10. Connection direct to a computer
Direct connection to a computer RS232 can be made by connecting Pin8 to a 1k series resistor and
connecting the other end of the resistor to the computer RS232 input. The mode is called pseudo
RS232. On a standard D9 socket, connect module Pin8 via the series 1k to pin2 of the D-type.
Connect the ground to Pin5 on the D-type. Leave the TX pin3 open. See “Useful Information” below
for free terminal download information.
Note that a +2.8v rail will result in the data outputs having a lower swing and may not be suitable for all computers.
10.1 Connection to a Processor UART
Direct connection to UART is made by connecting Pin9 to the UART Rx in pin
10.2 Connecting a Read LED
Sometimes the user may not want to drive a beeper but may still need to drive an LED. In this case a
driver transistor may not be necessary because the Beeper Output Pin can supply 5mA
continuously. Connect a 1k5 resistor to the Beeper Pin. This will limit the current. Connect the other
end of the resistor to the LED anode and connect the cathode to ground.
11. Useful information
For general testing we suggest the user downloads a terminal program free from the internet. Here
is one particularly good one to consider:
http://braypp.googlepages.com/terminal - Truly an excellent piece of software, the best terminal
we have ever seen.
If you have any technical queries please contact your local distributor, they have all the technical
resources to help you and support you. Where no local distributor exists, our technical helpline may
be contacted by writing to [e-mail]