HELP Muxed a/d

[Razzel]

I have a program which reads an ADC0831 via the parallel port. I occurs
to me that by using a CD4053 and sending it signals via the RS232 data
lines that I might be able to selectively read an ADCs data out line.
This would be accomplished by a minor mod to my existing program.

My concern is in adding the load of 2 more ADCs to the port and the
effect that will have RS232 lines 1, 3, & 4 are output from the
computer. I can't see that connecting the 3 together would effect the
ADC but I am not sure.

Can someone with this experience satisfy my anxiety?

RAZ

 

[Bob Masta]

On Tue, 19 Oct 2004 05:09:30 GMT, Razzel <logicon@zipcon.com> wrote:

I have a program which reads an ADC0831 via the parallel port. I occurs
to me that by using a CD4053 and sending it signals via the RS232 data
lines that I might be able to selectively read an ADCs data out line.
This would be accomplished by a minor mod to my existing program.

My concern is in adding the load of 2 more ADCs to the port and the
effect that will have RS232 lines 1, 3, & 4 are output from the
computer. I can't see that connecting the 3 together would effect the
ADC but I am not sure.

Can someone with this experience satisfy my anxiety?

RAZ

Why complicate things by adding a serial port?
You don't describe how you are reading the ADC
with the parallel port, but there are probably some
lines available there. If you are using the Data
address as input, you can use a couple of the
Control lines to control the 4053. If you are using
Status lines as input, you have 8 Data lines to
choose from.

I'm a little confused about your comment on
the "load of 2 more ADCs". You will be
connecting your 3 analog inputs to the 4053.
The single ADC sees the output of the 4053 and is
connected to the port as usual. The only
change is 2 extra port outputs to switch the
4053, a negligible load on the port.

Best regards,



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com