How to control several devices through one parallel port?
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How to control several devices through one parallel port?
Hello All,
I am given a project which includes writing software in Tcl/Tk and C in Linux to interface 10 digital circuits connected to one parallel port.
Actually, I know how to interface one circuit connected to a parallel port, but how to interface 10 different circuits so that each of them knows whom each signal is to?
For example, I want to send 8 bits to circuit number 2 through parallel port connected with 10 circuits, how to specify that it will really go only to the second circuit?
Interesting. The third parallel port interfacing question in about 4 hours.
I think the parport system is what you want to use, and has a decent explanation in The Linux 2.4 Parallel Port Subsystem.
You haven't said what constitutes a 'circuit'. Technically, a circuit could exist in a single bit, which would make your life relatively simple. I sense that what you really mean by a 'circuit' is a complete byte-wide or wider interface.
--- rod.
Interesting. The third parallel port interfacing question in about 4 hours.
I think the parport system is what you want to use, and has a decent explanation in The Linux 2.4 Parallel Port Subsystem.
You haven't said what constitutes a 'circuit'. Technically, a circuit could exist in a single bit, which would make your life relatively simple. I sense that what you really mean by a 'circuit' is a complete byte-wide or wider interface.
--- rod.
yes, it's byte-wide interface. i have several home-made digital circuits, which are pulse programmer, PC scope, and each of these has to be connected to one parallel port and controlled independently by PC user.
and many thanks for the link!
The IEEE-1284.3 standard provides for daisy chaining parallel port devices. Not sure exactly how it all works but AFAIK this is part of the linux parport subsystem. The standard allows for 8 devices.
scanners and zip drives were popular devices that were connected to the parallel port in addition to the printer.
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