Hello,
a couple of weeks ago I've opened a thread about the piniout of this cable here in this forum, see
thread723-676993 function of the cable is clear (see my recent posting) and I'm willing to draw and post a schematic here -- if someone could just post the assignment of the five pins on the back of the printer.
On the back of the printer the pins of the diagnostic port look like this:
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| o o o o o |
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1 2 3 4 5
Knowing that these are TTL-levels, I assume pin 5 to be GND, the rest _might_ be for example IN (pin 1, 2) and OUT (pin 4, 5). But these assignments are assumptions only !
So in case any tech-assistant reads this: please let all of us in this forum know the pinout.
oscar