Q on Sony "professional broadcast" RS422 pinouts

Oct 05, 2006 2 Replies

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Peter 19 years ago

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?

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Rich Grise 19 years ago

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

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martin griffith 19 years ago

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

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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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