RS232 in Titan

[John Speth]

At 03:59 PM 4/24/97 -0400, you wrote:
>Seeing as this discussion about RS232 has come up and it seems like
>there are some people here who know something about RS422 as well;
>I have the following questions.
>
>How difficult would it be to access my Emax's RS422 port using a Windoze
>PC? What would be involved as far as interface requirements etc?
>
>I have a friend who reckons he could write the appropriate software but
>does not have any info regarding RS422.
>
>Any ideas along these lines would be appreciated.

If my memory serves me right... RS422 is identical to RS232 except the
electrical signals are transmitted over a differential twisted pair cable
at 5V.  I think RS422 also specifies cable terminations.  So, to convert
Emax's RS422 to PC's RS232, you'd either 1) buy an RS422 interface card and
program it just as you would an RS232 card or 2) make a small outboard
interface circuit using the required RS422 specs.  I would choose option 1.

BUT ! My memory doesn't always serve me right so you should verify this.
Certainly buying the appropriate PC card would put that issue to rest.


John Speth (johns at oei.com)
Object Engineering, Inc.
Vancouver, WA