Fujitsu Centronics Standard Interface - ...Q030

[Philbo30]

A shot in the dark here....

Quick question, I'm working on a project involving an FTP-621DCL002
board and looking over the
"Centronics" standard pin assignments (Q030 connector) I have a
question about 23, 27 and 28. These are labeled RINF2, RINF1, RINF3
respectively. What functions do RINF2, RINF1, and RINF3 correspond to
in the Centronics standard interface?

 

[Graham W]

A shot in the dark here....

Quick question, I'm working on a project involving an FTP-621DCL002
board and looking over the
"Centronics" standard pin assignments (Q030 connector) I have a
question about 23, 27 and 28. These are labeled RINF2, RINF1, RINF3
respectively. What functions do RINF2, RINF1, and RINF3 correspond to
in the Centronics standard interface?

Thse are the return wires for some of the data lines. Normally grounded
(I think) - they are the for twisted pair cables so each data line has a
corresponding return wire. 28 is /acknlg return, 23 is D4 return, 27 is D8
return.

But the standard connector is 36 pins not 30. This might mess up the
numbering.

http://en.wikipedia.org/wiki/Centronics gives some more info.

HTH

 

[Philbo30]

Thse are the return wires for some of the data lines. Normally grounded
(I think) - they are the for twisted pair cables so each data line has a
corresponding return wire. 28 is /acknlg return, 23 is D4 return, 27 is D8
return.

But the standard connector is 36 pins not 30. This might mess up the
numbering.

http://en.wikipedia.org/wiki/Centronics gives some more info.

HTH

--
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It's kind of interesting. It looks like Fujitsu is implementing the
Centronics standard on 30 pins instead of 36 pins. This is an embedded
industrial component system so no real need for all 36 pins I guess.

But, in order to capture data, I've got to figure out how the 30 pin
Fujitsu interface maps to the 36 pin standard. Only 3 pins left to
figure out!

 

[Graham W]

It's kind of interesting. It looks like Fujitsu is implementing the
Centronics standard on 30 pins instead of 36 pins. This is an embedded
industrial component system so no real need for all 36 pins I guess.

But, in order to capture data, I've got to figure out how the 30 pin
Fujitsu interface maps to the 36 pin standard. Only 3 pins left to
figure out!

Are these the tree pins you mentioned earlier? Why don't you test
for continuity to ground on each of them using the probes both
ways round (polarity)? You don't need the board powered up to
do this.

 

[Franc Zabkar]

It's kind of interesting. It looks like Fujitsu is implementing the
Centronics standard on 30 pins instead of 36 pins. This is an embedded
industrial component system so no real need for all 36 pins I guess.

But, in order to capture data, I've got to figure out how the 30 pin
Fujitsu interface maps to the 36 pin standard. Only 3 pins left to
figure out!

According to this document ...

http://www.fujitsu.com/downloads/MICRO/fcai/printers/ftp-621dcl002_012.pdf

.... the three pins are "printer status" output pins.

The only other two outputs are ACKNLG* and BUSY. So it appears that
RINF1-3 correspond to some combination of SELECT_OUT, PAPER_END, and
FAULT*. You could test for PAPER_END by inserting and removing a sheet
of paper. SELECT_OUT should change state as you toggle the ON-LINE or
READY switch. Removing the print cartridge/ribbon may trigger the
FAULT* condition.

One other possibility you may wish to consider is whether RINF1-3
represent a 3-bit proprietary signalling system allowing for the
reporting of 7 or 8 different conditions.

- Franc Zabkar