48SX serial port and HP-IL


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.


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.


Things in common:

1) Number of pins

2) Both are bidirectional (can read and write)

3) Both are serial in nature


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.

Possibly Related Threads...
Thread Author Replies Views Last Post
  DIY HP 30b WP 34s serial flash/programming cable Richard Wahl 2 941 12-04-2013, 11:14 AM
Last Post: Barry Mead
  HP-41 module covers and side port cover Nate Martin 1 630 12-02-2013, 01:51 AM
Last Post: Giancarlo
  HP PRIME: command to read the SERIAL ? Joseph Ec 9 2,262 11-01-2013, 12:43 AM
Last Post: Joe Horn
  How to move lexfiles from PC to 71 w/o HP-IL? Joe Horn 9 1,364 10-18-2013, 03:50 PM
Last Post: Christoph Giesselink
  Yet another benchmark port on the wiki: Savage Pier Aiello 35 3,711 09-26-2013, 03:22 AM
Last Post: Pier Aiello
  Oldest HP 41c aka earliest Serial Number Gene Wright 23 2,446 09-05-2013, 03:45 AM
Last Post: Geoff Quickfall
  Hand Held Products RS232 to HP-IL aj04062 11 1,424 08-31-2013, 07:12 PM
Last Post: Paul Berger (Canada)
  HP IL over wifi ... (ILPer & go71b) Olivier De Smet 12 1,767 08-20-2013, 05:44 AM
Last Post: Olivier De Smet
  HP 50G serial port programming Chris Smith 2 605 06-15-2013, 02:47 PM
Last Post: Chris Smith
  HP 85 Serial Interface; INPUT Example? inaki 1 516 06-12-2013, 11:09 PM
Last Post: Paul Berger (Canada)

Forum Jump: