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Hi,
you can add an analog/digital convertor to your PC but that has a lot of
disadvantages; for one it ties your solution to your PC, you can not easily
move it to another PC, a laptop, etc.
The better solution is to encapsulate the required functionality in a
"peripheral". It could be built around a microcontroller that has both an
A/D convertor and an RS232C interface on board. Of course such device needs
its own code, it may require assembly or C code (it would not support the
.NET languages !)
If you are in control of the details of command/response coding,
you can make sure each of them use readable/printable characters only AND
have a single common terminator (such as a newline character),
making it a lot easier to communicate (and debug!).
If the required bandwidth is low (only a few tens or hundreds of chars/sec),
and if the real-time requirements are easy (you don't need the PC to react
within a few tens of milliseconds), then the serial port is easy and in fact
a very good way for interfacing a peripheral to a PC.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
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- show exceptions with ToString() to see all information
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Hi,
I have to read every output (sensors on the dyno) about once every 50ms. Is serial fast enough?
How bout any books about interfacing with serial and/or USB?
Thanks!
Yup, I'm a NEWB
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Hi,
a Windows PC would be capable of reading say 10 characters every 50 msec on average;
but sometimes it will have more urgent things to do, and it will read and process
the input with a delay of more than 50 msec; if you need a reaction on every
measurement (as is often the case in control engineering jobs), you would be better
to organize that in the microcontroller, and have it communicate with the PC
on a higher level, with no (or more relaxed) timing constraints.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Thanks! Now that I know what to do, I just need to find out how to do it 
I found a couple of books on C++, and I found Serial Complete and USB complete on amazon. I should be able to get through this with those two hehe Thanks a lot!
Brian
Yup, I'm a NEWB
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If you can read German or feel competent enough to interpret a German article based on circuit layout etc.:
http://www.heise.de/ct/projekte/ct-lab/[^]
ADA Motherboard with up to 5 optional daughter cards (AD / DA / IO), a SDK and other goodies, free of charge (the plans, not any of the hardware - but you can solder the stuff yourself).
Cheers,
Sebastian
--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton
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I need some quick help and i thought of the guru's on this forum. My cd/dvd rom won't read or write to Blank CD's. It reads Blank DVD's but says the file system is raw and has 0 bytes on the blank 700mb cd's.
I've tried to uninstall the cdrom and then searched for added hardware, reinstalled. but still not working. what can i do?
LM9478Y FQQ1200 SCSI CdRom
-and-
HL-DT-ST DVD+RW GWA4164B
show up as disk drives under Hardware
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Well make sure of three things first the cd-rom/dvd rom drives are ok, you may use device manager, then make sure the CDs / DVDs your using are OK this is detected when you insert them and a BLANK CD-ROM is poped up, third make sure the filesystem your chosing and the speed(52X,48X...etc.)are compatible with whats written on the CD-ROM/DVD-ROMS you purchased!If all is true post me again!
To follow the path, Walk with the MASTER, See through the MASTER, Be the MASTER!
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I have a serial interface on a device with 6 pins:
1 NC
2 0v
3 +12v
4 SClk
5 SData
6 0v
Now I want to wire this to a serial Port on a PC, I have wired the 12v and 0v to a molex, but I need to work out were to wire SClk and SData, I'm guessing (on previous experience) that I should be wiring SClk to DTR and SDATA to RX on the RS232.
I'm I warm or completely cold.
BTW: The 12v and 0v and input supply voltages.
-- modified at 9:02 Thursday 9th August, 2007
-- modified at 9:07 Thursday 9th August, 2007
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Hi Roger,
If yo have SClk & SData your serial is what is called synchronous (it uses a clock to sync, the data being read in on each clock pulse). Unfortunately RS232 is Asynchronous (no clock - data bit widths are a fixed time & data bytes begin with a start bit).
I don't know how to connect synchronous serial to a PC - possibly you could do it with the parallel port by toggling the clock and data yourself, or you will need some sort of adaptor.
Sorry its not good news, 
(PS I've type this message twice as the first one got lost in the ether - so sorry its brief)
Ali
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Ali, know of a good Sync/Async convertor?
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Hi Roger,
No I am afraid not, its the sort of thing I do all the time with a microprocessor - but I have never used an convertor. I even had a quick look for you at a couple of companies that might do one - but no joy.
I did find a USB convertor but I know nothing abaout it, link:-
www.jovasolutions.com/hardware/tims0100_overview.htm
Sorry, perhaps someone else can help,
Good luck,
Ali
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Thanks Margret 
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Ali
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Alison Pentland wrote: I came across this today and as they say "I thought of you", its an I2C USB Interface!
I bet not many women have said that to you!
Oh you're just one of millions
Had a look: articles date around 2004, there are newer ones, I'm just about buy a device under £20 USB->IC2, apparently these things are getting popular, whats needed is somebody to design a board and manufactor in China and bingo $$$. Sell for under £10 including an API
-> Norm <-
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is this device providing SClk or accepting SClk ?
is SData bidirectional, or do you need a one-way communication only ?
if accepting SClk, uni-directional communication, and limited amount of data per second
(say 100 upto 300 B/s) you could manage hooking it to some of the control lines of a
serial port.
But is sounds more like an I2C, an SPI or an SCI interface, and then you will not be able
to attach it without some extra electronics.
So you would have to find out more, and tell us or Google, before you can plan
an interface strategy.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Luc Pattyn wrote: is this device providing SClk or accepting SClk ?
Providing Clk
Luc Pattyn wrote: is SData bidirectional, or do you need a one-way communication only ?
One way
It's a Coin Validator (Money Controls, formerly Coin Controls) Sentinal unit.
It has a parallel interface (that works with a credit control unit) and a serial interface which has a strange port on it (similar to a uk telephone socket, but fractionly different.
The manual for this is here http://www.arcade-inferno.com/cabinet/Sentinel+Tech+Manual+V0.pdf[^]
Cheers.
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OK, I glimpsed through that manual, the interface part at least, and its "serial interface"
is an I2C interface (they call it IIC). As such there are a couple of problems:
- you need bidirectional lines for both SClk and SData; that would take the first diagram
in paragraph 3.3 twice; and it would require two input and two output pins on the PC;
that is exactly what is available as control pins on a serial port.
- biggest worry is the PC (not) being able to succesfully receive data all the time;
when the device speaks, it sends both SClk and SData at its own pace. The PC should
feel every edge on those two inputs to establish good communication; PCs being busy
doing all kinds of stuff, are not good at such real-time activities.
So a true convertor (such as the Jova item) would be more than welcome; but then it seems
too expensive. I would suggest you look for a cheaper convertor, either serial/I2C or
USB/I2C (would be more valuable in the long run).
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Luc
Thanks for all the information, I was way off mark thinking I could just attach this device straight into a serial port. Just for background information, I aquired the device from a Sega Mech Tech Aracde Machine (Circa 1989) the coin acceptor was connected onto the game board. I was hoping to reuse the coin acceptor after hooking it up and reading some manuals, I was guessing that the 'Serial Interface' was a true PC serial interface. Now I release this kind of device is plumbed into chip circuitry. I found a bit more into here: http://en.wikipedia.org/wiki/I%C2%B2C[^]
Again thanks for you help.
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Hi,
you're welcome.
It is a common mistake to think that anything called "serial interface" would fit the
serial port of a PC, which implements just one kind of serial interface (technically it
is an RS232C).
The Wikipedia article describes the interface of your coin acceptor (that is barring
possible historical evolution in I2C itself).
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Now it's down to finding a cheap USB 2 I2C convertor, the sucking the out the data. I suppose want I attempt is replacing the function of the Credit Control Board. The way I see it the Coin Validator is a dumb (black) box that sends out signals when a coin is placed into it. The Credit Control Board works out the coinage and totals and spits outs credits accordingly. So without a Credit Control Board, I left to hook up my own. All very interesting stuff when you get into the finer details
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Hi,
if you are in to both electronics and microcontroller software, then the easiest way
would be to buy some prototype or demo board for a microcontroller having an on-board
serial port (RS232C!) and four or more programmable I/O pins (or a real I2C, but that
is not really necessary since you can dedicate the entire microcontroller to watching
those two input pins). There are lots of those around, most of them cheap, and their
development tools most often are free.
Connecting the coin thing to it, and adding some embedded software would be al that
is required to get a real PC peripheral; pretty soon after that PC's with RS232C will
become obsolete, and you will need a USB-to-RS232C cable, but these currently are rather
cheap.
If your idea of software development is strictly PC-based, and you are
unfamiliar with embedded systems, it would be a challenge to get things working
without having the observability and debugging tools you have in say Visual Studio...
The choice is yours. Good luck!
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Luc Pattyn wrote: If your idea of software development is strictly PC-based, and you are
unfamiliar with embedded systems, it would be a challenge to get things working
without having the observability and debugging tools you have in say Visual Studio...
It is but I have used assembly in the past (wrote software for operating system many moons back), I'm not scared of a challange.
The idea of a broad with programmable pins sound good, I'm I write in saying the software to program the chip is PICBASIC? Can you provide a link with an example of a board which would 'do' the job.
Again Luc thanks for all your time you taken to answer questions.
![Beer | [beer]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/beer.gif)
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