Understanding Pinouts to make up TTL output cables.

[Jelly_Sheffield]

My big mill has an ancient Heidenhain DRO, which is better than nothing, but not by a lot.

I have been meaning to swap it for the "Sino" type DRO for ages, so it's standardised with everything else.

But put it off as I didn't want to spend money on new scales, to replace the old Heidenhain Sine-Wave type with modern TTL ones.

However, I managed to pick up two Heidenhain EXE 610 signal interpolators for a song the other day, which will take the old school 11μAcc sine wave signal, and convert to TTL, which makes things easier.

Unfortunately I am struggling to interpret between the differing nomenclature in the German and Chinese documentation.

The EXE 610's TTL output goes to a GX20-12 pin round connector, according to this Pinout:

Meanwhile the Sino counter takes its input via a DB9 connector, according to this Pinout:

I have both the GX20 and DB9 connectors, and a reel of shielded Cat-6 cable that I can use to make up a connector lead, but can't work out how to connect them up.

Can anyone advise which pins on the Heideinhain pinout, would correspond to the A, B and Z signals for the counter?

 

[Jelly_Sheffield]

Just figured it out, hopefully this will help someone else in the future.

Of the needed pins for the DB9:

Uₐ₀: absolute reference signal, corresponds to Z on the Sino pinout,

Uₐ₁: Square wave 1 signal, corresponds to A on Sino,

Uₐ₂: Square wave 2 signal, corresponds to B on Sino.

Of the other pins:

U̅ₐ̅₀̅: inverse of Uₐ₀, unused by Sino,

U̅ₐ̅₁̅: inverse of Uₐ₁, unused by Sino,

U̅ₐ̅₂̅: inverse of Uₐ₂, unused by Sino,

U̅ₛ̅: fault detection signal, unused by Sino,

0V Uₙ: duplicate of ground, appears to be unnecessary based on Heidenhain note,

5V Uₚ: duplicate of common, appears to be unnecessary based on Heidenhain note.

 

[dave h 2]

Try this link as a double check
A and B are the readout from the scale and are used to switch + and _ve direction of reading which makes Z the reference, which your scale may not produce depending on age. there a marker line or arrow on the scale which shows when the read head passes the ref point.
Checking the scale pinouts on the Heidenhain site will tell you how many wires are working.

Older Heidenhain scales have bulbs in them not LED, be nice to them yours may date from the 70's

 

[Jelly_Sheffield]

Try this link as a double check

I can follow the general principle of that with the interpolator boxes, but they're not going to use the now standard IC's, but something fiendishly 80's of Heideinhain's own creation.

Their sheer size alone suggests that they may not in fact use integrated circuits at all:

I did just identify that they use M23 and not GX20 connectors though, which is a bugger as I don't have any, and they're about 5× the price.

Checking the scale pinouts on the Heidenhain site will tell you how many wires are working.

I know the scales are compatible with the signal interpolators, as they're both Heidenhain and designed to match each other.

I will be leaving the scales well alone, because as you rightly point out:

Older Heidenhain scales have bulbs in them not LED, be nice to them yours may date from the 70's

They were fitted new by the importer circa 1981, when the guy I bought the mill from got it new, so they're at least 43 years old.

Changing the bulbs is apparently both expensive and fiddly, so I have zero desire to upset them.