Are you using unpowered line drivers?

All they do is convert RS-232 to RS-422
(and back again), don't they?

At the terminal end, all you should have to do is
find which pins are 15, 17, 19, & 25 are RXA, RXB,
TXA & TXB, then you could toss or re-use half your
existing line drivers.

At the DTC end, I suspect that all you have are
3-pin or 25-pin RS-232 direct connect ports.  You
would still need line drivers at that end.  If
they are modem ports you may be in luck.

> -----Original Message-----
> From: Abraham Zwygart [mailto:[log in to unmask]]
> Sent: Monday, August 23, 1999 6:31 PM
> To: [log in to unmask]
> Subject: DTC16 port configuration question?
>
>
> Hi all,
>
> We have a HP3000/979 with several DTC/16.  These are the
> older DTC that have
> RS232 connections.  In a couple of locations we have to use
> line drivers to
> span the distance between the DTC and terminal.  Our tech.
> has asked if
> RS422 connection could be used. Apparently RS422 can travel a
> much greater
> distance. then a RS232.
>
> RS232 use pins 2,3,7 as send, receive, ground
> RS422 use pins 15,17,19,25  as send, send, receive, receive,
> not sure what
> ground is.
>
> Can a DTC16 port be configured to handle RS422 and how do I
> configure it?
>
> Thanks for your time and help.
> Abraham Zwygart
> Senior Programmer Analysts     Email: [log in to unmask]
> Anodizing Inc.
>
> The thoughts, comments, and opinions expressed herein are mine
> and do not reflect those of my employer(s), or anyone else.
>