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Q on Sony "professional broadcast" RS422 pinouts

P

Peter

Jan 1, 1970
0
I am developing a product which is to drive a Sony or similar VTR.

I have the DB9 connector pinouts

1 GND
2 RXA
3 TXB
4 GND
5 GND
6 GND
7 RXB
8 TXA
9 GND

and it's working OK.

However, for an unrelated purpose I need to know whether the RS422
product being controlled actually connects to *all* the pins marked
GND.

I believe the straight-through DB9-DB9 cable normally used in these
applications does have all nine pins connected through, but is it
normal for the device itself to have GND on all of them?
 
R

Rich Grise

Jan 1, 1970
0
I am developing a product which is to drive a Sony or similar VTR.

I have the DB9 connector pinouts

1 GND
2 RXA
3 TXB
4 GND
5 GND
6 GND
7 RXB
8 TXA
9 GND

and it's working OK.

However, for an unrelated purpose I need to know whether the RS422
product being controlled actually connects to *all* the pins marked
GND.

I believe the straight-through DB9-DB9 cable normally used in these
applications does have all nine pins connected through, but is it
normal for the device itself to have GND on all of them?

Not at all. In a "normal" DB-9, several of those pins are used for
things like RTS, CTS, DTR, DSR, and RI.

But a cable should go straight through and not care, as long as both
ends are wired the same in the equipment.

Good Luck!
Rich
 
E

Eeyore

Jan 1, 1970
0
Rich said:
Not at all. In a "normal" DB-9, several of those pins are used for
things like RTS, CTS, DTR, DSR, and RI.

He said *RS-422* !

Graham
 
M

martin griffith

Jan 1, 1970
0
On Thu, 05 Oct 2006 15:02:27 +0100, in sci.electronics.design
I am developing a product which is to drive a Sony or similar VTR.

I have the DB9 connector pinouts

1 GND
2 RXA
3 TXB
4 GND
5 GND
6 GND
7 RXB
8 TXA
9 GND

and it's working OK.

However, for an unrelated purpose I need to know whether the RS422
product being controlled actually connects to *all* the pins marked
GND.

I believe the straight-through DB9-DB9 cable normally used in these
applications does have all nine pins connected through, but is it
normal for the device itself to have GND on all of them?
not quite,
pins 1 and 9 are chassis ground
the others are signal ground, but 5 is spare

So basically you have two sheilded twisted pair cables, each with a
ground, and ignore the rest

http://www.belle-nuit.com/archives/9pin.html

But in patch fields I just used the twisted pairs only, it works fine,
but that was with all the tech stuff chassis bolted to ground.


martin
 
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