HP Forum Archive 02

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48SX serial port and HP-IL Message #1 Posted by Brendon Nafziger on 16 Feb 2000, 9:01 p.m. This may be a dumb question but I'm curious to find out the answer. The serial port on my 48SX has four pins and so does the HP-IL port on my 71B (two in and two out). Is there anything in common with these ports? Could a 48 some how print to a 2225B printer? Any ideas would be appreciated.

Re: 48SX serial port and HP-IL Message #2 Posted by Reinhard Hawel on 16 Feb 2000, 10:31 p.m., in response to message #1 by Brendon Nafziger Nope. These interfaces have nothing in common, other than being 2 wire interfaces (2 wire in - 2 wire out). There are different voltages, signal lenghts and a different logical behaviour of the devices. AFAIK the german company W&W planned a HP-IL interface years ago. W&W seems to be long gone and I doubt they ever brought the IL module out (I may be completely wrong at this point). I planned building such a thing (a generic IL chip) years ago, but it's surely not the first in a large line of planned projects.

Re: 48SX serial port and HP-IL Message #3 Posted by Steve on 16 Feb 2000, 10:35 p.m., in response to message #1 by Brendon Nafziger Things in common: 1) Number of pins 2) Both are bidirectional (can read and write) 3) Both are serial in nature Differences 1) speed (RS232 goes at differnt speeds, HP-IL has a single (high) speed. (When I say high, I mean high in comparason to RS232 serial). 2) protocol 3) RS232 is unbalanced, HP-IL is balanced 4) HP-IL is ring based, RS232 is point to point 5) HP-IL devices are addressed, RS232 are not and so much more.... HP-IL and RS232 are about as different as you can get for a system of sending information in a bitwise serial manner. HP-IL has more in common with HP-IB than it does with RS232.

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